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Baisha Weng
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China

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Journal article
Published: 11 May 2021 in Chemosphere
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Improving accumulation of heavy metals (HMs) by plants is an important pathway for constructed wetland (CW) to alleviate the environmental risks caused by their release. This study aims to regulate HMs (Cr, Ni, Cu, Zn, and Cd) accumulated by Acorus calamus L. in the sandy substrate CW with different nitrogen forms, including ammonia (NH4+), nitrate (NO3‾), and NH4+/NO3‾ (1:1) in synthetic tailwaters. In general, the removal efficiency of HMs by CW could reach 92.4% under the initial concentrations below 500 μg/L. Accumulation percentages of HMs in the shoots and roots of plants in CW with NH4+ and NH4+/NO3‾ influents increased by 52–395% and 15–101%, respectively, when compared with that of NO3‾ treatment. Influents with NH4+ promoted plant growth of Acorus calamus L. and metabolic functions, such as carbohydrate metabolism/amino acid metabolism, related to HMs mobilization of rhizosphere bacterial communities, which might induce more organic acids and amino acids secreted by plants and microbes during their metabolic processes. These are the main reasons for the enhancive mobilization of HMs from their precipitation fractions and their uptake by plants in CW with NH4+ treatments. Moreover, the enhancement of organics secreted from plants and microbes also led to the high denitrification efficiency and nitrogen removal in CW. Overall, this study could provide a feasible method for the enhancive accumulation of HMs by wetland plants via the regulation water treatment process to appropriately increase NH4+ for CW.

ACS Style

Jun-Feng Wang; Cong-Yun Zhu; Bai-Sha Weng; Pei-Wen Mo; Zi-Jie Xu; Ping Tian; Bao-Shan Cui; Jun-Hong Bai. Regulation of heavy metals accumulated by Acorus calamus L. in constructed wetland through different nitrogen forms. Chemosphere 2021, 281, 130773 .

AMA Style

Jun-Feng Wang, Cong-Yun Zhu, Bai-Sha Weng, Pei-Wen Mo, Zi-Jie Xu, Ping Tian, Bao-Shan Cui, Jun-Hong Bai. Regulation of heavy metals accumulated by Acorus calamus L. in constructed wetland through different nitrogen forms. Chemosphere. 2021; 281 ():130773.

Chicago/Turabian Style

Jun-Feng Wang; Cong-Yun Zhu; Bai-Sha Weng; Pei-Wen Mo; Zi-Jie Xu; Ping Tian; Bao-Shan Cui; Jun-Hong Bai. 2021. "Regulation of heavy metals accumulated by Acorus calamus L. in constructed wetland through different nitrogen forms." Chemosphere 281, no. : 130773.

Journal article
Published: 14 April 2021 in Journal of Hydrology
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Over the past few decades, the Nu River Watershed (NRW), which originates in the Qinghai–Tibet Plateau and covers an area of 113,414 km2, has experienced increased streamflow, temperatures, and precipitation along with cryospheric degradation. To determine the mechanism of increase of the observed streamflow composition, a distributed hydrological model (WEP-C) was developed to investigate the streamflow composition and its changes in the NRW from 1979 to 2019. During this period, glaciers, snowmelt, permafrost, groundwater, and precipitation accounted for 3.2%, 13.4%, 0.8%, 10.4%, and 72.2% of the NRW streamflow, respectively. The streamflow of the watershed increased at a rate of 1.36 mm/year. Among the contribution rates to the increase of streamflow, glaciers increased at a rate of 0.28 mm/year and snowmelt decreased at a rate of −0.53 mm/year. Additionally, permafrost meltwater, groundwater, and precipitation increased at a rate of 0.03 mm/year, 0.60 mm/year, and 0.98 mm/year, respectively. Thus, this study provides an understanding of the composition and change of streamflow in the Qinghai–Tibet Plateau and similar watersheds, wherein the cryosphere plays an important part in the hydrological cycle.

ACS Style

Yuheng Yang; Baisha Weng; Denghua Yan; Yongzhen Niu; Yanyu Dai; Meng Li; Xiaoyan Gong. Partitioning the contributions of cryospheric change to the increase of streamflow on the Nu River. Journal of Hydrology 2021, 598, 126330 .

AMA Style

Yuheng Yang, Baisha Weng, Denghua Yan, Yongzhen Niu, Yanyu Dai, Meng Li, Xiaoyan Gong. Partitioning the contributions of cryospheric change to the increase of streamflow on the Nu River. Journal of Hydrology. 2021; 598 ():126330.

Chicago/Turabian Style

Yuheng Yang; Baisha Weng; Denghua Yan; Yongzhen Niu; Yanyu Dai; Meng Li; Xiaoyan Gong. 2021. "Partitioning the contributions of cryospheric change to the increase of streamflow on the Nu River." Journal of Hydrology 598, no. : 126330.

Journal article
Published: 10 April 2021 in Applied Soil Ecology
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As one of the ecological measures to control soil erosion and land degradation, the Returning Farmland to Forest Program (RFFP) has been implemented about 30 years in China. To date, the effectiveness of the RFFP is debated. Most studies have focused on the changes in landscape patterns at different scales, exploring the forest cover changes. However, few studies revealed the ecological effects especially the ecological stability, even less in alpine areas. Twelve sampling sites in the Huangshui River Basin were selected to test whether the RFFP improved the quality and stability of rhizosphere ecosystems. The sampling sites located in the RFFP zone, natural ecosystems (perennial grassland, perennial forest), and anthropogenic ecosystems (farmland, human activity zone), respectively. The results showed that the RFFP has improved the physicochemical properties of soil and plant, has increased the relevant abundance of nitrogen fixing bacteria and phosphate-solubilizing bacteria, and has high network stability than anthropogenic ecosystems, while still has certain distance with natural ecosystems. The RFFP definitely has positive impacts on improving the stability and diversity of the ecosystems in alpine areas. This study provides references for estimating the implementation effects of the RFFP from the ecological perspective, which could further guide the next round of the RFFP policy.

ACS Style

Wuxia Bi; Kun Wang; Baisha Weng; Denghua Yan; Siyu Liu. Does The Returning Farmland to Forest Program improve the ecosystem stability of rhizosphere in winter in alpine regions? Applied Soil Ecology 2021, 165, 104011 .

AMA Style

Wuxia Bi, Kun Wang, Baisha Weng, Denghua Yan, Siyu Liu. Does The Returning Farmland to Forest Program improve the ecosystem stability of rhizosphere in winter in alpine regions? Applied Soil Ecology. 2021; 165 ():104011.

Chicago/Turabian Style

Wuxia Bi; Kun Wang; Baisha Weng; Denghua Yan; Siyu Liu. 2021. "Does The Returning Farmland to Forest Program improve the ecosystem stability of rhizosphere in winter in alpine regions?" Applied Soil Ecology 165, no. : 104011.

Journal article
Published: 21 March 2021 in Journal of Hydrology: Regional Studies
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The Nagqu River watershed (NRW) on the Qinghai–Tibet Plateau (QTP). Precipitation, snowmelt, streamflow, and groundwater samples were collected in the NRW and used to analyze the contribution of different water sources to streamflow during different freeze–thaw periods. Stable isotopes of hydrogen (D) and oxygen (18O) and water chemistry were analyzed for the period ranging from 2016 to 2019, and tritium (T) and carbon-14 (14C) isotopes were analyzed for 2019. Rain and snowmelt were found to reflect the chemical characteristics of precipitation, and the primary ions in both water types were Ca2+ and SO42−. The δD and δ18O isotope values of rain and snowmelt were relatively low during the entire thaw period (from June to October) and relatively high in the entire frozen period (from November to May). The results of the optimum multiparameter and mass balance analyses showed that groundwater and snowmelt accounted for approximately 39.8 % and 32.2 % to the Nagqu River water flow, respectively, whereas precipitation accounted for approximately 28.0 %. The groundwater in clastic rock fissures around the northern Cuona Lake, and permafrost and ground ice in the bedrock layer were identified as older water types with relatively low infiltration rates, and bedrock fissures in the southeastern and southwestern areas contained younger water with better recoverability.

ACS Style

Yuheng Yang; Baisha Weng; Denghua Yan; Xiaoyan Gong; Yanyu Dai; Yongzhen Niu; Guoqiang Dong. Tracing potential water sources of the Nagqu River using stable isotopes. Journal of Hydrology: Regional Studies 2021, 34, 100807 .

AMA Style

Yuheng Yang, Baisha Weng, Denghua Yan, Xiaoyan Gong, Yanyu Dai, Yongzhen Niu, Guoqiang Dong. Tracing potential water sources of the Nagqu River using stable isotopes. Journal of Hydrology: Regional Studies. 2021; 34 ():100807.

Chicago/Turabian Style

Yuheng Yang; Baisha Weng; Denghua Yan; Xiaoyan Gong; Yanyu Dai; Yongzhen Niu; Guoqiang Dong. 2021. "Tracing potential water sources of the Nagqu River using stable isotopes." Journal of Hydrology: Regional Studies 34, no. : 100807.

Journal article
Published: 22 January 2021 in Sustainability
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The Tuul River Basin is the most important socioeconomic and political base area of Mongolia. Therefore, studying the interrelationships between changes in the ecohydrological processes of this basin and its land cover is of great importance for maintaining sustainability and the environment. This study investigated the annual average air temperature, total annual precipitation, and river discharge variability, and land cover changes at selected stations of the basin by using the hydrometeorological analysis, satellite analysis, and land cover determination statistical analysis. During the study period, the average annual air temperature rose from −1.5 °C to +0.3 °C (1.8 °C). The average annual precipitation exhibits relatively low change during this period. River discharge varied during the study period. A significant decreasing trend in river discharge was observed at the Terelj (φ = −2.72) and Ulaanbaatar (φ = −5.63) stations, whereas the other stations, Altanbulag, Lun, and Orkhontuul, showed a significant increasing trend. During the study period, changes in land cover were directly related to main hydrometeorological parameters. Between 2000 and 2020, the amount of grassland decreased by 319.67 km2, while the area of water bodies increased by 28.36 km2. In the study area, mainly water bodies and sensitive areas of the land cover types were changed due to changes in precipitation. Studies in the arid and semiarid regions of Central Asia show that changes of ecohydrological processes have a significant impact on land cover changes.

ACS Style

Batsuren Dorjsuren; Nyamdavaa Batsaikhan; Denghua Yan; Otgonbayar Yadamjav; Sonomdagva Chonokhuu; Altanbold Enkhbold; Tianlin Qin; Baisha Weng; Wuxia Bi; Otgonbayar Demberel; Tsasanchimeg Boldsaikhan; Oyunkhuu Gombo; Mohammed Gedefaw; Abel Girma; Asaminew Abiyu. Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin. Sustainability 2021, 13, 1153 .

AMA Style

Batsuren Dorjsuren, Nyamdavaa Batsaikhan, Denghua Yan, Otgonbayar Yadamjav, Sonomdagva Chonokhuu, Altanbold Enkhbold, Tianlin Qin, Baisha Weng, Wuxia Bi, Otgonbayar Demberel, Tsasanchimeg Boldsaikhan, Oyunkhuu Gombo, Mohammed Gedefaw, Abel Girma, Asaminew Abiyu. Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin. Sustainability. 2021; 13 (3):1153.

Chicago/Turabian Style

Batsuren Dorjsuren; Nyamdavaa Batsaikhan; Denghua Yan; Otgonbayar Yadamjav; Sonomdagva Chonokhuu; Altanbold Enkhbold; Tianlin Qin; Baisha Weng; Wuxia Bi; Otgonbayar Demberel; Tsasanchimeg Boldsaikhan; Oyunkhuu Gombo; Mohammed Gedefaw; Abel Girma; Asaminew Abiyu. 2021. "Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin." Sustainability 13, no. 3: 1153.

Journal article
Published: 09 December 2020 in Journal of Hydrology: Regional Studies
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The Nagqu River Watershed in the Qinghai–Tibet Plateau. A computational unit is the basic spatial unit employed in distributed hydrological models (DHMs), which combines the spatiotemporal distributions of meteorological variables and physical parameters denoted within a region to reveal the characteristics affecting the water cycle of watersheds. However, the current methods developed for spatially divided regions into computational units fail to consider the physical meaning and impact of climate change in montane altitudinal zones (MAZs), which significantly affects alpine watersheds. This study proposes a method for assigning the computational units of alpine DHMs according to one-period MAZ that explicitly account for physical meaning and climate change. The benefits of the proposed altitudinal discretization method are verified by applying it to construct a DHM based on the water and energy transfer processes in large river basins (WEP-L) models. The results obtained using the WEP-L, SWAT model and the new regional division method (denoted as the WEP-C model) that applies the proposed altitudinal discretization method are compared. The results demonstrate that the simulation accuracy of the daily and monthly streamflows and daily soil moisture from the alpine watershed is improved by the use of the proposed altitudinal discretization method, which provide guidance for further DHM development and can be applied to other hydrological models.

ACS Style

Yuheng Yang; Baisha Weng; Denghua Yan; Yongzhen Niu; Xiaoyan Gong; Meng Li. Method for assigning hydrological computational units in alpine watersheds. Journal of Hydrology: Regional Studies 2020, 32, 100759 .

AMA Style

Yuheng Yang, Baisha Weng, Denghua Yan, Yongzhen Niu, Xiaoyan Gong, Meng Li. Method for assigning hydrological computational units in alpine watersheds. Journal of Hydrology: Regional Studies. 2020; 32 ():100759.

Chicago/Turabian Style

Yuheng Yang; Baisha Weng; Denghua Yan; Yongzhen Niu; Xiaoyan Gong; Meng Li. 2020. "Method for assigning hydrological computational units in alpine watersheds." Journal of Hydrology: Regional Studies 32, no. : 100759.

Special issue paper
Published: 14 October 2020 in Hydrological Processes
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The major hydrological factors in lake‐marsh systems are water level (depth), water surface area and water volume. The key index for determining the lake‐marsh pattern is water level, which leads to the variation of lake‐marsh patterns under natural hydrological alternations. In addition, the vegetation structure also affects the lake‐marsh pattern. With socio‐economic development and climate change, the “land use” and “water use” competitions appear more seriously between a lake‐marsh system and its surrounding socio‐economic system, also inside the lake‐marsh system. The possible optimal lake‐marsh pattern could solve the contradictions mentioned above. As few studies focus on this issue, this study proposed an optimal lake‐marsh pattern determination method with eco‐hydrological management on relieving the land use and water use competitions. The optimal lake‐marsh pattern determination method considers the protection objects (water depth demands), water supply (precipitation, surface water, and groundwater) and water demand (especially evapotranspiration) in the system at annual and monthly scales. Calculation and analysis were performed for the optimal pattern of the Wolonghu Wetlands as an example. The results mainly showed that the lake‐marsh pattern of the Wolonghu Wetlands cannot be achieved on meeting both the maximum ecological services values and minimum water shortage amount under present natural condition. With artificial regulation measures, the possible optimal annual lake‐marsh patterns can be obtained based on both ecological and hydrological objectives, with the area ratio of lake and marsh in the range of 0.650 : 0.350 and 0.726 : 0.274, the corresponding water level of lake body was of 86.85 m to 87.0 m. This study could provide references for the Wolonghu Wetlands management, also for similar lake‐marsh systems and other ecological systems. This article is protected by copyright. All rights reserved.

ACS Style

Wuxia Bi; Baisha Weng; Denghua Yan; Meng Li; Zhilei Yu; Ling Wang; Hao Wang. Optimal lake‐marsh pattern determination in lake‐marsh systems based on the eco‐hydrological processes management. Hydrological Processes 2020, 34, 5260 -5277.

AMA Style

Wuxia Bi, Baisha Weng, Denghua Yan, Meng Li, Zhilei Yu, Ling Wang, Hao Wang. Optimal lake‐marsh pattern determination in lake‐marsh systems based on the eco‐hydrological processes management. Hydrological Processes. 2020; 34 (26):5260-5277.

Chicago/Turabian Style

Wuxia Bi; Baisha Weng; Denghua Yan; Meng Li; Zhilei Yu; Ling Wang; Hao Wang. 2020. "Optimal lake‐marsh pattern determination in lake‐marsh systems based on the eco‐hydrological processes management." Hydrological Processes 34, no. 26: 5260-5277.

Journal article
Published: 21 May 2020 in Water
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The Ugii Nuur Lake is not only one of the small hydrologically closed lakes located in the Orkhon River Basin in Central Mongolia but also the most vulnerable area for global climate change. Therefore, this study aims to investigate the impacts of recent global climate change on the water surface area. The data we analyzed were various measured hydro-meteorological variables of the lake basin and the lake surface area, which was estimated from Landsat series satellite data from 1986 to 2018. The methods we used were Mann-Kendall (MK), Innovative trend analysis method (ITAM), Sen’s slope estimator test, correlation, and regression analysis. The variation of lake water surface area has a strong positive correlation with the change of the lake water level (r = 0.95). The Mann-Kendall trend analysis has indicated that under a significant decrease in total annual precipitation ( Z = −0.902) and inflow river discharge ( Z = −5.392) and a considerable increase in total annual evaporation ( Z = 4.385) and annual average air temperature ( Z = 4.595), the surface area of the Ugii Nuur Lake has decreased sharply ( Z = −6.021). The total annual evaporation (r = −0.64) and inflow river discharge (r = 0.67) were the essential hydro-meteorological factors affecting the surface area of the Ugii Nuur Lake. The lake surface area decreased by 13.5% in 2018 compared with 1986. In the near future, it is vital to conduct scientific studies considering the volume of lake water, groundwater, and the anthropogenic impact.

ACS Style

Erdenesukh Sumiya; Batsuren Dorjsuren; Denghua Yan; Sandelger Dorligjav; Hao Wang; Altanbold Enkhbold; Baisha Weng; Tianlin Qin; Kun Wang; Tuvshin Gerelmaa; Oyunbaatar Dambaravjaa; Wuxia Bi; Yuheng Yang; Byambabayar Ganbold; Mohammed Gedefaw; Asaminew Abiyu; Abel Girma. Changes in Water Surface Area of the Lake in the Steppe Region of Mongolia: A Case Study of Ugii Nuur Lake, Central Mongolia. Water 2020, 12, 1470 .

AMA Style

Erdenesukh Sumiya, Batsuren Dorjsuren, Denghua Yan, Sandelger Dorligjav, Hao Wang, Altanbold Enkhbold, Baisha Weng, Tianlin Qin, Kun Wang, Tuvshin Gerelmaa, Oyunbaatar Dambaravjaa, Wuxia Bi, Yuheng Yang, Byambabayar Ganbold, Mohammed Gedefaw, Asaminew Abiyu, Abel Girma. Changes in Water Surface Area of the Lake in the Steppe Region of Mongolia: A Case Study of Ugii Nuur Lake, Central Mongolia. Water. 2020; 12 (5):1470.

Chicago/Turabian Style

Erdenesukh Sumiya; Batsuren Dorjsuren; Denghua Yan; Sandelger Dorligjav; Hao Wang; Altanbold Enkhbold; Baisha Weng; Tianlin Qin; Kun Wang; Tuvshin Gerelmaa; Oyunbaatar Dambaravjaa; Wuxia Bi; Yuheng Yang; Byambabayar Ganbold; Mohammed Gedefaw; Asaminew Abiyu; Abel Girma. 2020. "Changes in Water Surface Area of the Lake in the Steppe Region of Mongolia: A Case Study of Ugii Nuur Lake, Central Mongolia." Water 12, no. 5: 1470.

Preprint content
Published: 23 March 2020
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Stream water age is an essential indicator of stream water renewal and pollutant transport rates in the Qinghai-Tibet Plateau (QTP). Recently, the concept of a young water fraction (Fyw , calculated using stable isotopic data, was proposed as a measure of stream water age. The relative age of older stream in streams has yet to be quantified, however. In this study, we proposed a method to calculate the relative proportions of middle-aged and old-age water in runoff. The results revealed that in the Nagqu watershed, an average of 23% of the runoff was < 51.6 days old, whereas an average of 55% of the runoff had ages ranging from 51.6 days to 1. The change in stream water age is significantly influenced by the runoff composition, evaporation, air temperature, and soil moisture at a depth of 20 cm. The amount of stored glacial ice, soil ice, snow cover, groundwater, and other old water in the QTP appears to be decreasing under the influence of climate change. The results of this study are helpful for the study of runoff composition and stream water age, as well as their responses to climate change.

ACS Style

Yuheng Yang; Baisha Weng. Using Stable Isotopes to Estimate Stream Water Age in the Qinghai-Tibet Plateau. 2020, 1 .

AMA Style

Yuheng Yang, Baisha Weng. Using Stable Isotopes to Estimate Stream Water Age in the Qinghai-Tibet Plateau. . 2020; ():1.

Chicago/Turabian Style

Yuheng Yang; Baisha Weng. 2020. "Using Stable Isotopes to Estimate Stream Water Age in the Qinghai-Tibet Plateau." , no. : 1.

Journal article
Published: 31 December 2019 in Geoderma
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Phosphorus (P) is well known as a vital nutrient required for plant growth and a critical factor often causing eutrophication in water bodies. However, few studies have focused on the effects of drought-flood abrupt alternation (DFAA), a new type of extreme climate event, on the transformation of P in farmland systems. In this study, we, therefore, focused on DFAA effects on available P (AP) in topsoil, soluble P (SP) and total P (TP) in surface runoff, as well as plant P contents and P uptake in summer maize farmland systems. Field control experiments (sheltered under a ventilated shed with an artificial rainfall device) were conducted to simulate two levels of DFAA (i.e., light drought-light flood and moderate drought-light flood) during parts of two summer maize growing seasons (i.e., seeding-jointing stage and tasseling-grain filling stage). Results showed that DFAA increased AP concentration in topsoil, which was probably induced by the accumulation of the phyla Proteobacteria and Actinobacteria under moderate drought and by an increase in phosphate-solubilizing bacteria (PSB), especially the genera Bacillus and Bradyrhizobium. In addition, broken soil aggregates and increasing soil porosity caused by DFAA could also cause an increase of AP in topsoil. Soluble P and TP in surface runoff showed a decreasing trend with moderate drought in DFAA. The higher AP increased the root P uptake, while P in stems and leaves could be transported to fruits under DFAA with moderate drought. The results could provide some references for the study of the effects and adaptation-strategies related to extreme climate events and their effects on P in farmland systems.

ACS Style

Wuxia Bi; Baisha Weng; Denghua Yan; Mengke Wang; Hao Wang; JinJie Wang; Huiling Yan. Effects of drought-flood abrupt alternation on phosphorus in summer maize farmland systems. Geoderma 2019, 363, 114147 .

AMA Style

Wuxia Bi, Baisha Weng, Denghua Yan, Mengke Wang, Hao Wang, JinJie Wang, Huiling Yan. Effects of drought-flood abrupt alternation on phosphorus in summer maize farmland systems. Geoderma. 2019; 363 ():114147.

Chicago/Turabian Style

Wuxia Bi; Baisha Weng; Denghua Yan; Mengke Wang; Hao Wang; JinJie Wang; Huiling Yan. 2019. "Effects of drought-flood abrupt alternation on phosphorus in summer maize farmland systems." Geoderma 363, no. : 114147.

Journal article
Published: 25 December 2019 in Atmosphere
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Climate change, especially precipitation change, will significantly change soil moisture, which then influences root growth, further affecting yield and grain quality. Previous studies focused on the drought or flood effects on summer maize growth. However, few studied the effects of drought-flood abrupt alternation (DFAA) on the growth of summer maize. We explored the DFAA impacts on the roots, leaf area index (LAI), yield, and grain quality in field. The main results show that DFAA had different impacts on the summer maize growth in the seeding-jointing stage (SJS) and tasseling-grain filling stage (TGS). In general, the DFAA reduced the yield. Roots at the depth of 40 cm had obviously positive impacts on the yield. The DFAA reduced the LAI and promoted the maximum LAI achieving in advance. The grain crude protein augmented under DFAA. The drought had evidently negative impacts on the grain crude fat in the TGS, while it had no obvious influence in the SJS. DFAA had no apparent impact on the grain crude starch. These results could provide some references for the effects and adaptation-strategies study of extreme climate events and their impacts on growth of summer maize.

ACS Style

Wuxia Bi; Mengke Wang; Baisha Weng; Denghua Yan; Yuheng Yang; JinJie Wang. Effects of Drought-Flood Abrupt Alternation on the Growth of Summer Maize. Atmosphere 2019, 11, 21 .

AMA Style

Wuxia Bi, Mengke Wang, Baisha Weng, Denghua Yan, Yuheng Yang, JinJie Wang. Effects of Drought-Flood Abrupt Alternation on the Growth of Summer Maize. Atmosphere. 2019; 11 (1):21.

Chicago/Turabian Style

Wuxia Bi; Mengke Wang; Baisha Weng; Denghua Yan; Yuheng Yang; JinJie Wang. 2019. "Effects of Drought-Flood Abrupt Alternation on the Growth of Summer Maize." Atmosphere 11, no. 1: 21.

Journal article
Published: 12 November 2019 in International Journal of Environmental Research and Public Health
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Stable hydrogen and oxygen isotopes are important indicators for studying water cycles. The isotopes are not only affected by climate, but are also disturbed by human activities. Urban construction has changed the natural attributes and underlying surface characteristics of river basins, thus affecting the isotopic composition of river water. We collected urban river water isotope data from the Global Network for Isotopes in Rivers (GNIR) database and the literature, and collected river water samples from the Naqu basin and Huangshui River basin on the Tibetan Plateau to measure hydrogen and oxygen isotopes. Based on 13 pairs of urban area and non-urban area water samples from these data, the relationship between the isotopic values of river water and the artificial surface area of cities around rivers was analyzed. The results have shown that the hydrogen and oxygen isotope (δD and δ18O) values of river water in urban areas were significantly higher than those in non-urban areas. The isotopic variability of urban and non-urban water was positively correlated with the artificial surface area around the rivers. In addition, based on the analysis of isotope data from 21 rivers, we found that the cumulative effects of cities on hydrogen and oxygen isotopes have led to differences in surface water line equations for cities with different levels of development. The combined effects of climate and human factors were the important reasons for the variation of isotope characteristics in river water in cities. Stable isotopes can not only be used to study the effects of climate on water cycles, but also serve as an important indicator for studying the degree of river development and utilization.

ACS Style

Xiangnan Li; Baisha Weng; Denghua Yan; TianLing Qin; Kun Wang; Wuxia Bi; Zhilei Yu; Batsuren Dorjsuren. Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities. International Journal of Environmental Research and Public Health 2019, 16, 4429 .

AMA Style

Xiangnan Li, Baisha Weng, Denghua Yan, TianLing Qin, Kun Wang, Wuxia Bi, Zhilei Yu, Batsuren Dorjsuren. Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities. International Journal of Environmental Research and Public Health. 2019; 16 (22):4429.

Chicago/Turabian Style

Xiangnan Li; Baisha Weng; Denghua Yan; TianLing Qin; Kun Wang; Wuxia Bi; Zhilei Yu; Batsuren Dorjsuren. 2019. "Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities." International Journal of Environmental Research and Public Health 16, no. 22: 4429.

Research article
Published: 03 November 2019 in Advances in Meteorology
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Climate change has emerged as a significant man-made global environmental challenge marked by rising temperature. The global rising temperature is supposed to alter climatic patterns like floods and droughts, thereby affecting human life supporting system and global food production. In order to clarify the impact of weather events on agricultural production in karst landforms, this study selected the indices of the growth period of crops (start time and duration), growing season precipitation, intense precipitation, number of consecutive rainless days, and number of drought-flood abrupt alternation events to evaluate the variation trend of future weather events and their impact on crop growth in Guizhou Province, China. The results show that (1) the climate is generally getting warmer. From 2019 to 2050, the sowing period of winter wheat and rice tends to be postponed. The duration of maize and rice’s growth period will be shortened, and the life cycle of wheat also emerges as having a decreasing tendency except for those from the southern region. Comparing with the mean value during 1961 to 2018, the average crop cycle length of winter wheat, summer maize, and rice was shortened. The rate of shortening of crop cycle length is faster than the value during 1961 to 2018. (2) In the next 30 years, extreme precipitation concentrates in June and mainly falls in the central and southeast parts of Guizhou Province. In addition, summer is the outbreak period of drought events and drought-flood abrupt alternation events, which has a great impact on crop’s growth. This study can provide references for the planting system, structure, layout, and management of crops in the karst region.

ACS Style

Jun Ma; Baisha Weng; Wuxia Bi; Dan Xu; Ting Xu; Dengming Yan. Impact of Climate Change on the Growth of Typical Crops in Karst Areas: A Case Study of Guizhou Province. Advances in Meteorology 2019, 2019, 1 -16.

AMA Style

Jun Ma, Baisha Weng, Wuxia Bi, Dan Xu, Ting Xu, Dengming Yan. Impact of Climate Change on the Growth of Typical Crops in Karst Areas: A Case Study of Guizhou Province. Advances in Meteorology. 2019; 2019 ():1-16.

Chicago/Turabian Style

Jun Ma; Baisha Weng; Wuxia Bi; Dan Xu; Ting Xu; Dengming Yan. 2019. "Impact of Climate Change on the Growth of Typical Crops in Karst Areas: A Case Study of Guizhou Province." Advances in Meteorology 2019, no. : 1-16.

Journal article
Published: 24 October 2019 in Ecological Indicators
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Understanding the response of runoff composition in the Qinghai-Tibet Plateau (QTP) is essential for the ecology and environment. However, precise measurements of runoff composition in the QTP, especially in remote areas with limited climatic records, are a challenge. In rivers and lakes, some plankton is highly sensitive to changes in runoff composition. Here, we demonstrated how plankton indicators could be used as an indicator of runoff composition in the QTP. The stable isotopes of runoff, precipitation, groundwater and snowmelt in 9 sampling sites were studies of the Nagqu River in the QTP. The multi-source mass balance model (IsoSource model) was used to calculate the range of runoff composition at each sampling site. We found that the change of plankton biodiversity was associated to the runoff composition, and groundwater ratio was negatively correlated with biodiversity, while precipitation ratio was positively correlated with biodiversity, but not with snowmelt. Therefore, plankton diversity is expected to be a simple indicator of runoff composition, which can be easily quantified in remote plateau areas.

ACS Style

Baisha Weng; Yuheng Yang; Denghua Yan; Jianwei Wang; Guoqiang Dong; Kun Wang; TianLing Qin; Batsuren Dorjsuren. Shift in plankton diversity and structure: Influence of runoff composition in the Nagqu River on the Qinghai-Tibet Plateau. Ecological Indicators 2019, 109, 105818 .

AMA Style

Baisha Weng, Yuheng Yang, Denghua Yan, Jianwei Wang, Guoqiang Dong, Kun Wang, TianLing Qin, Batsuren Dorjsuren. Shift in plankton diversity and structure: Influence of runoff composition in the Nagqu River on the Qinghai-Tibet Plateau. Ecological Indicators. 2019; 109 ():105818.

Chicago/Turabian Style

Baisha Weng; Yuheng Yang; Denghua Yan; Jianwei Wang; Guoqiang Dong; Kun Wang; TianLing Qin; Batsuren Dorjsuren. 2019. "Shift in plankton diversity and structure: Influence of runoff composition in the Nagqu River on the Qinghai-Tibet Plateau." Ecological Indicators 109, no. : 105818.

Journal article
Published: 16 October 2019 in Journal of Hydrology
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River network coding is important for hydrological model on the aspects of water cycles simulation, water resources evaluation and extreme hydrological events forecast. However, the existing river network coding methods had several disadvantages, such as, the river network coding structure is too complex to understand, the river network topology is difficult to identify, the river network coding capacity is limited. To overcome the above-mentioned shortcomings, this paper proposed a new topological and hierarchical river coding method based on the river network created by the DEM (Digital Elevation Method) data and ArcGIS software. This method systematically defines the river levels based on the hydrology structure from outlet to source. The river directly flows into the watershed outlet is river L1, the branch of river L1 with a certain catchment area is river L2, the branch of L2 with a certain catchment area is river L3, and so on. Secondly, we proposed a flexible coding scheme that encode the river segments with pure digital numbers hierarchically. Taking the two-digits scheme for example, the L1 river segments are coded with a sequence number, such as [01], [02], [03], […]. The L2 river segments inherit the river code from the L1 stem river segment, add a serial of self-order numbers (01, 02, 03, ……) from the junction to the river source, and become [0101], [0102], [0103], […]. The process of coding the river segments at subsequent level is similar. Finally, this new coding method was programmed in Matlab software, and successfully examined in the Amazon River basin, the world's largest watershed, as a case study. The results show that the new method is competent for easily controlling the river level and river segment density, flexibly adjusting the code digital numbers to fit different basins with abundant or little rivers, easily plotting the topological relationship, automatically encoding by computer program and easily understood. In a word, this study is a useful attempt to create new river network coding method, and it also has positive significance to promote the hydrological simulation research.

ACS Style

Kun Wang; Denghua Yan; TianLing Qin; Baisha Weng; Hao Wang; Wuxia Bi; Xiangnan Li; Batsuren Dorjsuren. A new topological and hierarchical river coding method based on the hydrology structure. Journal of Hydrology 2019, 580, 124243 .

AMA Style

Kun Wang, Denghua Yan, TianLing Qin, Baisha Weng, Hao Wang, Wuxia Bi, Xiangnan Li, Batsuren Dorjsuren. A new topological and hierarchical river coding method based on the hydrology structure. Journal of Hydrology. 2019; 580 ():124243.

Chicago/Turabian Style

Kun Wang; Denghua Yan; TianLing Qin; Baisha Weng; Hao Wang; Wuxia Bi; Xiangnan Li; Batsuren Dorjsuren. 2019. "A new topological and hierarchical river coding method based on the hydrology structure." Journal of Hydrology 580, no. : 124243.

Journal article
Published: 13 October 2019 in Water
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The freezing–thawing cycle is a basic feature of a frozen soil ecosystem, and it affects the growth of alpine vegetation both directly and indirectly. As the climate changes, the freezing–thawing mode, along with its impact on frozen soil ecosystems, also changes. In this research, the freezing–thawing cycle of the Nagqu River Basin in the Qinghai–Tibet Plateau was studied. Vegetation growth characteristics and microbial abundance were analyzed under different freezing–thawing modes. The direct and indirect effects of the freezing–thawing cycle mode on alpine vegetation in the Nagqu River Basin are presented, and the changing trends and hazards of the freezing–thawing cycle mode due to climate change are discussed. The results highlight two major findings. First, the freezing–thawing cycle in the Nagqu River Basin has a high-frequency mode (HFM) and a low-frequency mode (LFM). With the influence of climate change, the LFM is gradually shifting to the HFM. Second, the alpine vegetation biomass in the HFM is lower than that in the LFM. Frequent freezing–thawing cycles reduce root cell activity and can even lead to root cell death. On the other hand, frequent freezing–thawing cycles increase microbial (Bradyrhizobium, Mesorhizobium, and Pseudomonas) death, weaken symbiotic nitrogen fixation and the disease resistance of vegetation, accelerate soil nutrient loss, reduce the soil water holding capacity and soil moisture, and hinder root growth. This study provides a complete response mechanism of alpine vegetation to the freezing–thawing cycle frequency while providing a theoretical basis for studying the change direction and impact on the frozen soil ecosystem due to climate change.

ACS Style

Zihao Man; Baisha Weng; Yuheng Yang; Xiaoyan Gong; Meng Li; Zhilei Yu. Effects of the Freezing–Thawing Cycle Mode on Alpine Vegetation in the Nagqu River Basin of the Qinghai–Tibet Plateau. Water 2019, 11, 2122 .

AMA Style

Zihao Man, Baisha Weng, Yuheng Yang, Xiaoyan Gong, Meng Li, Zhilei Yu. Effects of the Freezing–Thawing Cycle Mode on Alpine Vegetation in the Nagqu River Basin of the Qinghai–Tibet Plateau. Water. 2019; 11 (10):2122.

Chicago/Turabian Style

Zihao Man; Baisha Weng; Yuheng Yang; Xiaoyan Gong; Meng Li; Zhilei Yu. 2019. "Effects of the Freezing–Thawing Cycle Mode on Alpine Vegetation in the Nagqu River Basin of the Qinghai–Tibet Plateau." Water 11, no. 10: 2122.

Author correction
Published: 06 September 2019 in Scientific Data
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An amendment to this paper has been published and can be accessed via a link at the top of the paper.

ACS Style

Denghua Yan; Meng Li; Wuxia Bi; Baisha Weng; TianLing Qin; Jianwei Wang; Pierre Do. Author Correction: A data set of inland lake catchment boundaries for the Qiangtang Plateau. Scientific Data 2019, 6, 1 -1.

AMA Style

Denghua Yan, Meng Li, Wuxia Bi, Baisha Weng, TianLing Qin, Jianwei Wang, Pierre Do. Author Correction: A data set of inland lake catchment boundaries for the Qiangtang Plateau. Scientific Data. 2019; 6 (1):1-1.

Chicago/Turabian Style

Denghua Yan; Meng Li; Wuxia Bi; Baisha Weng; TianLing Qin; Jianwei Wang; Pierre Do. 2019. "Author Correction: A data set of inland lake catchment boundaries for the Qiangtang Plateau." Scientific Data 6, no. 1: 1-1.

Journal article
Published: 10 August 2019 in Water
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Machine learning algorithms are becoming more and more popular in natural disaster assessment. Although the technology has been tested in flood susceptibility analysis of several watersheds, research on global flood disaster risk assessment based on machine learning methods is still rare. Considering that the watershed is the basic unit of water management, the purpose of this study was to conduct a risk assessment of floods in the global fourth-level watersheds. Thirteen conditioning factors were selected, including: maximum daily precipitation, precipitation concentration degree, altitude, slope, relief degree of land surface, soil type, Manning coefficient, proportion of forest and shrubland, proportion of artificial surface, proportion of cropland, drainage density, population, and gross domestic product. Four machine learning algorithms were selected in this study: logistic regression, naive Bayes, AdaBoost, and random forest. The global susceptibility assessment model was constructed based on four machine learning algorithms, thirteen conditioning factors, and global flood inventories. The evaluation results of the model show that the random forest performed better in the test, and is an efficient and reliable tool in flood susceptibility assessment. Sensitivity analysis of the conditioning factors showed that precipitation concentration degree and Manning coefficient were the main factors affecting flood risk in the watersheds. The susceptibility map showed that fourth-level watersheds in the global high-risk area accounted for a large proportion of the total watersheds. With the increase of extreme hydrological events caused by climate change, global flood disasters are still one of the most threatening natural disasters. The global flood susceptibility map from this study can provide a reference for global flood management.

ACS Style

Xiangnan Li; Denghua Yan; Kun Wang; Baisha Weng; TianLing Qin; Siyu Liu. Flood Risk Assessment of Global Watersheds Based on Multiple Machine Learning Models. Water 2019, 11, 1654 .

AMA Style

Xiangnan Li, Denghua Yan, Kun Wang, Baisha Weng, TianLing Qin, Siyu Liu. Flood Risk Assessment of Global Watersheds Based on Multiple Machine Learning Models. Water. 2019; 11 (8):1654.

Chicago/Turabian Style

Xiangnan Li; Denghua Yan; Kun Wang; Baisha Weng; TianLing Qin; Siyu Liu. 2019. "Flood Risk Assessment of Global Watersheds Based on Multiple Machine Learning Models." Water 11, no. 8: 1654.

Review
Published: 22 May 2019 in International Journal of Environmental Research and Public Health
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The 2303 Wetlands of International Importance distribute unevenly in different continents. Europe owns the largest number of sites, while Africa has the largest area of sites. More than half of the sites are affected by three or four impact factors (55%). The most significant impact factors are pollution (54%), biological resources use (53%), natural system modification (53%), and agriculture and aquaculture (42%). The main affected objects are land area and environment of the wetlands, occurred in 75% and 69% of the sites, respectively. The types most affected by land area occupation are river wetlands and lake wetlands, the types with the greatest impact on environment are marine/coastal wetlands and river wetlands, the type with the greatest impact on biodiversity is river wetlands, the types most affected by water resources regulation are marsh wetlands and river wetlands, and the types most affected by climate change are lake wetlands and marine/coastal wetlands. About one-third of the wetland sites have been artificially reconstructed. However, it is found that the proportions of natural wetland sites not affected or affected by only one factor are generally higher than that of wetland sites both containing natural wetlands and human-made wetlands, while the proportions of wetland sites both containing natural wetlands and human-made wetlands affected by three or four factors are generally higher than that of natural wetland sites. Wetland sites in the UK and Ireland are least affected among all countries. Wetland management plans in different regions still have large space for improvement, especially in Africa and Asia. The protection and restoration of global wetlands can be carried out in five aspects, including management and policy, monitoring, restoration, knowledge, and funding.

ACS Style

Ting Xu; Baisha Weng; Denghua Yan; Kun Wang; Xiangnan Li; Wuxia Bi; Meng Li; Xiangjun Cheng; YinXue Liu. Wetlands of International Importance: Status, Threats, and Future Protection. International Journal of Environmental Research and Public Health 2019, 16, 1818 .

AMA Style

Ting Xu, Baisha Weng, Denghua Yan, Kun Wang, Xiangnan Li, Wuxia Bi, Meng Li, Xiangjun Cheng, YinXue Liu. Wetlands of International Importance: Status, Threats, and Future Protection. International Journal of Environmental Research and Public Health. 2019; 16 (10):1818.

Chicago/Turabian Style

Ting Xu; Baisha Weng; Denghua Yan; Kun Wang; Xiangnan Li; Wuxia Bi; Meng Li; Xiangjun Cheng; YinXue Liu. 2019. "Wetlands of International Importance: Status, Threats, and Future Protection." International Journal of Environmental Research and Public Health 16, no. 10: 1818.

Data descriptor
Published: 16 May 2019 in Scientific Data
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A catchment is the basic unit for studying hydrologic cycle processes and associated climate change impacts. Accurate catchment delineation is essential in the field of hydrology, environment, and meteorology. Traditionally, catchment delineation is most easily carried out where the outflow area can be easily determined because of a well-defined outlet. The obstacle of the current study is to determine accurately the catchment boundary of lakes that are internally draining and, therefore, lack a well-defined outflow (i.e. inland lakes). This study describes a catchment delineation method which demarcated all the catchments of the lakes in the Qiangtang Plateau, especially for the inland lakes and their closed catchments. Lake catchment boundaries determined for the Qiangtang Plateau provide a significant advancement for water resource and climate change evaluation and agriculture production in the area.

ACS Style

Denghua Yan; Meng Li; Wuxia Bi; Baisha Weng; TianLing Qin; Jianwei Wang; Pierre Do. A data set of inland lake catchment boundaries for the Qiangtang Plateau. Scientific Data 2019, 6, 62 .

AMA Style

Denghua Yan, Meng Li, Wuxia Bi, Baisha Weng, TianLing Qin, Jianwei Wang, Pierre Do. A data set of inland lake catchment boundaries for the Qiangtang Plateau. Scientific Data. 2019; 6 (1):62.

Chicago/Turabian Style

Denghua Yan; Meng Li; Wuxia Bi; Baisha Weng; TianLing Qin; Jianwei Wang; Pierre Do. 2019. "A data set of inland lake catchment boundaries for the Qiangtang Plateau." Scientific Data 6, no. 1: 62.