This page has only limited features, please log in for full access.
Wetlands are among the natural ecosystems with the highest soil carbon stocks on Earth. However, how anthropogenic disturbances have impacted the quantity and distribution of wetland carbon pool in China is not well understood. Here we used a comprehensive countrywide wetland inventory and Landsat 8 data to document the spatial patterns in China's wetland areas and carbon pools and to understand the underlying causes of their changes from the 1980s to 2010s. We found that the wetland area and carbon pool have decreased from 4.11 × 105 km2 and 15.2 Pg C in the 1980s to 2.14 × 105 km2 and 7.6 Pg C in the 2010s, respectively. Using the human influence index (HII) as a quantitative measure of anthropogenic disturbance intensity, we found a positive relationship between the HII values and wetland decreases in many regions and across China as a whole—which have increased 17% during the time period—indicating that anthropogenic disturbances have been a major factor causing wetland destruction in recent decades. This study provides new evidence for recent changes in China's wetland carbon pool and emphasizes the importance of mitigating anthropogenic disturbances for wetland conservation.
Mingzhi Lu; Yuanchun Zou; Qilei Xun; Zicheng Yu; Ming Jiang; Lianxi Sheng; Xianguo Lu; Deli Wang. Anthropogenic disturbances caused declines in the wetland area and carbon pool in China during the last four decades. Global Change Biology 2021, 27, 3837 -3845.
AMA StyleMingzhi Lu, Yuanchun Zou, Qilei Xun, Zicheng Yu, Ming Jiang, Lianxi Sheng, Xianguo Lu, Deli Wang. Anthropogenic disturbances caused declines in the wetland area and carbon pool in China during the last four decades. Global Change Biology. 2021; 27 (16):3837-3845.
Chicago/Turabian StyleMingzhi Lu; Yuanchun Zou; Qilei Xun; Zicheng Yu; Ming Jiang; Lianxi Sheng; Xianguo Lu; Deli Wang. 2021. "Anthropogenic disturbances caused declines in the wetland area and carbon pool in China during the last four decades." Global Change Biology 27, no. 16: 3837-3845.
Constructed wetland (CW) has obvious advantages in wastewater treatment of medium and small towns. However, there is a lack of health monitoring research on CW system clogging. The electrical conductivity (EC) of wastewater purified by CW is related to the concentration of pollutants, which can reflect the CW clogging. The objectives of this study are to reveal the mechanisms of CWs substrate clogging from the perspective of wastewater EC changes, and provide an important reference for the health evaluation of CWs. The EC changes of nine CWs substrates (quartz sand, zeolite, gravel, coarse sand, straw biochar, sludge biochar, clay ceramsite, fly ash ceramsite and shale ceramsite) under different conditions (purified water, wastewater and wastewater + NaCl) were tested, and comparative analysis was used to reveal the influence of different substrate materials on the change of wastewater EC. The results show that the adsorption ability of substrate material isn't the main factor affecting the EC of wastewater, and the soluble component in the material is the important factor to cause the difference of EC increment. Under the condition of 0.4–1.0 g L−1 NaCl concentration, the adsorption of substrate materials had little effect on the EC of wastewater, and the effect of NaCl used in CW tracer experiment was good. Quartz sand, coarse sand, gravel and sludge biochar have little influence on the change of wastewater EC. Other materials that have great influence on the change of wastewater EC can be treated by modifying or controlling the mixing ratio. The results are of great significance to reveal the clogging state of CW system and to carry out health assessment research.
Hanxi Wang; Jitian Sun; Jianling Xu; Lianxi Sheng. Study on clogging mechanisms of constructed wetlands from the perspective of wastewater electrical conductivity change under different substrate conditions. Journal of Environmental Management 2021, 292, 112813 .
AMA StyleHanxi Wang, Jitian Sun, Jianling Xu, Lianxi Sheng. Study on clogging mechanisms of constructed wetlands from the perspective of wastewater electrical conductivity change under different substrate conditions. Journal of Environmental Management. 2021; 292 ():112813.
Chicago/Turabian StyleHanxi Wang; Jitian Sun; Jianling Xu; Lianxi Sheng. 2021. "Study on clogging mechanisms of constructed wetlands from the perspective of wastewater electrical conductivity change under different substrate conditions." Journal of Environmental Management 292, no. : 112813.
Municipal sludge is a solid waste material, and resource utilization is the optimal way to dispose of this material. The amount of municipal sludge produced in China is large, and it can be used in the preparation of ceramsite. The content of Al2O3 in drinking water treatment sludge is significantly higher than that in wastewater treatment sludge, while the content of K2O, Na2O and MgO in the two kinds of sludge is similar. When sludge is used to prepare ceramsite, the amount of sludge in most raw materials for ceramsite is less than 50%. The bulk density of the prepared sludge ceramsite is less than 1000 kg m−3, and the highest water absorption rate is close to 40%. The leaching content of heavy metals in municipal sludge-based ceramsite is within the standard health safety limit, and heavy metals are better stabilized. The fitting effect of the pseudo-second-order kinetic equation of the dynamic adsorption of sludge ceramsite is obviously better than that of the pseudo-first-order kinetic equation. Sludge ceramsite used in bio-filter media and constructed wetland (CW) substrates is good able to purify wastewater. In the future, the preparation method of municipal sludge ceramsite and purification research of CW substrates based on sludge ceramsite need to be further improved.
Hanxi Wang; Jianling Xu; Yunqing Liu; Lianxi Sheng. Preparation of ceramsite from municipal sludge and its application in water treatment: A review. Journal of Environmental Management 2021, 287, 112374 .
AMA StyleHanxi Wang, Jianling Xu, Yunqing Liu, Lianxi Sheng. Preparation of ceramsite from municipal sludge and its application in water treatment: A review. Journal of Environmental Management. 2021; 287 ():112374.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Yunqing Liu; Lianxi Sheng. 2021. "Preparation of ceramsite from municipal sludge and its application in water treatment: A review." Journal of Environmental Management 287, no. : 112374.
Clogging is a significant concern in the development of constructed wetlands (CWs). This review performs an in-depth analysis of the reasons, influencing factors and regularities of CW clogging and provides an important basis for treatments addressing clogging in CWs. The factors affecting CW clogging primarily include substrate porosity, hydraulic load, oxygen supply conditions, organic loading, water depth, and plants; among these factors, organic loading and substrate porosity have the most significant impact. The use of proper particle size, multilayer substrates and backwashing helps to slow CW clogging. Selecting aquatic plants with developed root systems and removing leaves and dead roots in a timely manner can significantly reduce CW clogging. The cost of earthworms used in CWs is significantly lower than that of substrate replacement and backwashing. To improve the comprehensive application effect of CWs, future research efforts should attempt to combine the findings of anti-clogging research and improve the purification effect of CWs. This review is of considerable significance for promoting the sustainable development of CWs.
Hanxi Wang; Lianxi Sheng; Jianling Xu. Clogging mechanisms of constructed wetlands: A critical review. Journal of Cleaner Production 2021, 295, 126455 .
AMA StyleHanxi Wang, Lianxi Sheng, Jianling Xu. Clogging mechanisms of constructed wetlands: A critical review. Journal of Cleaner Production. 2021; 295 ():126455.
Chicago/Turabian StyleHanxi Wang; Lianxi Sheng; Jianling Xu. 2021. "Clogging mechanisms of constructed wetlands: A critical review." Journal of Cleaner Production 295, no. : 126455.
Plant straw resources are rich, and the annual yield of crop straw is large. To reduce environmental pollution caused by the burning of plant straw and realize maximum resource utilization of straw, the published literature data are analyzed in depth. It was found that the carbon element content in the straw was about 40% and the ash content was low. The straw activated carbon can meet the adsorption standard requirements of wooden activated carbon, which was a good material for the sustainable utilization of activated carbon. The activated carbons prepared from cotton straw and hemp straw have large specific surface area, and the total pore volumes of activated carbon from sunflower straw and hemp straw are obviously higher than that of other straw activated carbon. In order to improve the quality of activated carbon, the effects of various activators are better than that of single activator in the preparation of straw activated carbon. The study found that when the ratio of the initial concentration of pollutants to the adsorbent concentration is 30, the removal efficiencies of heavy metals (Cu(II), Cr(VI) and Fe(III)) aren’t less than 90%. This review will be of great significance to optimize the preparation conditions of straw activated carbon, improve the quality of straw activated carbon and expand the application range of straw activated carbon.
Hanxi Wang; Jianling Xu; Xuejun Liu; Lianxi Sheng. Preparation of straw activated carbon and its application in wastewater treatment: A review. Journal of Cleaner Production 2020, 283, 124671 .
AMA StyleHanxi Wang, Jianling Xu, Xuejun Liu, Lianxi Sheng. Preparation of straw activated carbon and its application in wastewater treatment: A review. Journal of Cleaner Production. 2020; 283 ():124671.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Xuejun Liu; Lianxi Sheng. 2020. "Preparation of straw activated carbon and its application in wastewater treatment: A review." Journal of Cleaner Production 283, no. : 124671.
Climate change is an important factor affecting the ecological environment of regions, and the local climate is closely related to the ecological environment. Taking the Changbai Mountain National Natural Reserve as an example, the regional climate change was studied by analyzing the data from the years 1953–2017. It is found that the temperature of Changbai Mountain is on the rise; the maximum monthly mean temperature difference is approximately 35 °C and the annual mean temperature is 2–5 °C. The monthly mean wind speed in this area has a wavy distribution and obvious seasonal variation. The correlation analysis shows that the correlation coefficient of the monthly mean value of cumulative photosynthetically active radiation (PAR) and total solar radiation (TSR), cumulative evaporation and cumulative PAR, cumulative evaporation and TSR, temperature and cumulative PAR, and temperature and cumulative evaporation were more than 0.9, indicating a significant correlation. The annual cumulative precipitation in this area is between 600 and 1000 mm, the annual cumulative evaporation is between 1000 and 1500 mm, the annual cumulative PAR is between 6000 and 10,000 mol m−2 s−1, and the annual TSR is between 4000 and 6000 MJ m−2. The annual cumulative precipitation, annual cumulative evaporation, annual mean wind speed, annual cumulative PAR, and annual TSR show a downward trend. The climate change in this area will not have a greater negative impact on the forest, but it still needs to pay close attention to the further climate change.
Hanxi Wang; Jianling Xu; Lianxi Sheng; Liang Ma; Xuejun Liu. Study on the characteristics of climate change in Changbai Mountain National Natural Reserve from 1958 to 2017. Arabian Journal of Geosciences 2020, 13, 1 -16.
AMA StyleHanxi Wang, Jianling Xu, Lianxi Sheng, Liang Ma, Xuejun Liu. Study on the characteristics of climate change in Changbai Mountain National Natural Reserve from 1958 to 2017. Arabian Journal of Geosciences. 2020; 13 (16):1-16.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Lianxi Sheng; Liang Ma; Xuejun Liu. 2020. "Study on the characteristics of climate change in Changbai Mountain National Natural Reserve from 1958 to 2017." Arabian Journal of Geosciences 13, no. 16: 1-16.
China is rich in straw resources, but its utilization value is low. The preparation of biochar from straw will help to improve the utilization level of straw and realize the full utilization of straw. Based on the literature review, it is found that the content of volatile matter is 60–80% in dry straw, and the content of fixed carbon is 13–25%. The content of carbon element in straw is about 40%, which is a good material for biochar production. It was found that the specific surface area, pore volume and pore size of straw biochar could be improved by reducing the heating rate and prolonging the carbonization time. The results show that the simulation effect of pseudo second-order kinetic equation is better than that of pseudo first-order kinetic model. In the future work, the research on biochar gasification pyrolysis, low-temperature carbonization and the purification mechanism of constructed wetland (CW) related to properties of biochar materials needs to be strengthened. The related research points out the direction for the challenges and future research of biochar preparation and biochar CW application.
Hanxi Wang; Jianling Xu; Lianxi Sheng. Preparation of straw biochar and application of constructed wetland in China: A review. Journal of Cleaner Production 2020, 273, 123131 .
AMA StyleHanxi Wang, Jianling Xu, Lianxi Sheng. Preparation of straw biochar and application of constructed wetland in China: A review. Journal of Cleaner Production. 2020; 273 ():123131.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Lianxi Sheng. 2020. "Preparation of straw biochar and application of constructed wetland in China: A review." Journal of Cleaner Production 273, no. : 123131.
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Xue Wang; Xueyuan Bai; Liang Ma; Chunguang He; Haibo Jiang; Lianxi Sheng; Wenbo Luo. Author Correction: Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China. Scientific Reports 2020, 10, 1 -2.
AMA StyleXue Wang, Xueyuan Bai, Liang Ma, Chunguang He, Haibo Jiang, Lianxi Sheng, Wenbo Luo. Author Correction: Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China. Scientific Reports. 2020; 10 (1):1-2.
Chicago/Turabian StyleXue Wang; Xueyuan Bai; Liang Ma; Chunguang He; Haibo Jiang; Lianxi Sheng; Wenbo Luo. 2020. "Author Correction: Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China." Scientific Reports 10, no. 1: 1-2.
Snow depth may have a complex influence on carbon cycling in winter. Here we set up a field experiment to investigate how different snow depths (0 cm, 60 cm, 90 cm) influenced carbon dioxide (CO2) in a wetland. The mean ± standard error of CO2 emissions under snow addition treatments (60 cm and 90 cm snow depths) were 0.92 ± 0.16 g·cm−2·s−1 and 0.53 ± 0.16 g·cm−2·s−1, respectively, compared with snow removal treatment (0 cm snow depth), 0.11 ± 0.05 g·cm−2·s−1. In general, snow addition increased CO2 fluxes significantly. As snow depths increased, microbial biomass carbon (MBC) and bacterial diversities increased drastically. More important, the community of bacteria differed under different treatments. Firmicutes, which can resist dehydration and extremely low temperatures, was widely distributed in the snow removal treatment, where it sustained soil biochemical processes. Overall, our study indicates that snow cover counteracts the negative effects on soil microbial activities caused by low temperatures and could play a critical role in winter carbon cycling in wetlands.
Xue Wang; Xueyuan Bai; Liang Ma; Chunguang He; Haibo Jiang; Lianxi Sheng; Wenbo Luo. Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China. Scientific Reports 2020, 10, 1 -10.
AMA StyleXue Wang, Xueyuan Bai, Liang Ma, Chunguang He, Haibo Jiang, Lianxi Sheng, Wenbo Luo. Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China. Scientific Reports. 2020; 10 (1):1-10.
Chicago/Turabian StyleXue Wang; Xueyuan Bai; Liang Ma; Chunguang He; Haibo Jiang; Lianxi Sheng; Wenbo Luo. 2020. "Snow depths’ impact on soil microbial activities and carbon dioxide fluxes from a temperate wetland in Northeast China." Scientific Reports 10, no. 1: 1-10.
Constructed wetlands can play an active role in improving the water quality of urban rivers. In this study, a sequential series system of the floating-bed constructed wetland (FBCW), horizontal subsurface flow constructed wetland (HSFCW), and surface flow constructed wetland (SFCW) were constructed for the urban river treatment in the cold regions of North China, which gave full play to the combined advantages. In the Yitong River, the designed capacity and the hydraulic loading of the system was 100 m3/d and 0.10 m3/m2d, respectively. The hydraulic retention time was approximately 72 h. The monitoring results, from April to October in 2016, showed the multiple wetland ecosystem could effectively remove chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphate (TP), and suspended solids (SS) at average removal rates of 74.79%, 80.90%, 71.12%, 78.44%, and 91.90%, respectively. The removal rate of SS in floating-bed wetland was the largest among all the indicators (80.24%), which could prevent the block of sub-surface flow wetland effectively. The sub-surface flow wetland could remove the NH4-N, TN, and TP effectively, and the contribution rates were 79.20%, 64.64%, and 81.71%, respectively. The surface flow wetland could further purify the TN and the removal rate of TN could reach 23%. The total investment of this ecological engineering was $12,000. The construction cost and the operation cost were $120 and $0.02 per ton of polluted water, which was about 1/3 to 1/5 and 1/6 to 1/3 of the conventional sewage treatment, respectively. The results of this study provide a technical demonstration of the restoration of polluted water in urban rivers in northern China.
Xueyuan Bai; Xianfang Zhu; Haibo Jiang; Zhongqiang Wang; Chunguang He; Lianxi Sheng; Jie Zhuang. Purification Effect of Sequential Constructed Wetland for the Polluted Water in Urban River. Water 2020, 12, 1054 .
AMA StyleXueyuan Bai, Xianfang Zhu, Haibo Jiang, Zhongqiang Wang, Chunguang He, Lianxi Sheng, Jie Zhuang. Purification Effect of Sequential Constructed Wetland for the Polluted Water in Urban River. Water. 2020; 12 (4):1054.
Chicago/Turabian StyleXueyuan Bai; Xianfang Zhu; Haibo Jiang; Zhongqiang Wang; Chunguang He; Lianxi Sheng; Jie Zhuang. 2020. "Purification Effect of Sequential Constructed Wetland for the Polluted Water in Urban River." Water 12, no. 4: 1054.
Taking the typical plain city of Shangqiu as an example, groundwater balance is analyzed by monitoring precipitation and groundwater level. A correlation analysis shows that there is a significant correlation between groundwater level change and precipitation. By formulating the groundwater balance evaluation criteria, it was found that the evaluation grade was grade III in 1997, and most of the years were at grade II. It is suggested that measures should be taken to adjust the industrial layout, optimize the planting structure, and strengthen the utilization of reclaimed water to realize the scientific utilization of groundwater resources.
Hanxi Wang; Jianling Xu; Lianxi Sheng; Liang Ma; Xuejun Liu. Time-space analysis of groundwater in China plain area and its water quantity balance analysis. Arabian Journal of Geosciences 2020, 13, 1 -9.
AMA StyleHanxi Wang, Jianling Xu, Lianxi Sheng, Liang Ma, Xuejun Liu. Time-space analysis of groundwater in China plain area and its water quantity balance analysis. Arabian Journal of Geosciences. 2020; 13 (2):1-9.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Lianxi Sheng; Liang Ma; Xuejun Liu. 2020. "Time-space analysis of groundwater in China plain area and its water quantity balance analysis." Arabian Journal of Geosciences 13, no. 2: 1-9.
Land use/cover change (LUCC) attributed to natural factors and human activities has led to the loss of ecosystem services, making the quantitative valuation of ecosystem services the scientific focal pointfor sustainable development. This study assessed changes in the ecosystem services values (ESVs) due to LUCC during the period 1990–2016 in the Kilombero Valley floodplain, located in southeastern Tanzania. Moderate resolution Landsat images from 1990, 2010 and 2016 were obtained and analyzed using a random forest (RF) algorithm for classification, and ArcGIS Desktop software (version 10.2, Esri, Redlands, CA, USA) for mapping to assess the LUCC. The ESVs were estimated based on the benefit transfer approach using adopted global value coefficients and modified local value coefficients. The results revealed that the aggregated ESVs of the forests, bushlands, wetlands, and water had decreased, consequently leading to a total loss of US$ 811.5 million (26.6%) in ESVs over the past 26 years when calculated with the modified local value coefficients to US$ 3000.7 million (42.3%) when calculated with global value coefficients. Moreover, the loss in the ESV was attributed to the decreased values of water regulation, climate regulation, erosion control, nutrient cyclying, habitat/refugia, and water supply, with the exception of the values of food production and biological control, which gradually increased during the study period. This study provided minimum estimates of the ecosystem service values, which willcontribute to the formulation of policy actions and strategies for sustainable management of the Kilombero Valley floodplain and inform various stakeholders on the tradeoffs involved in the use of land resources.
Nangware Kajia Msofe; Lianxi Sheng; Zhenxin Li; James Lyimo. Impact of Land Use/Cover Change on Ecosystem Service Values in the Kilombero Valley Floodplain, Southeastern Tanzania. Forests 2020, 11, 109 .
AMA StyleNangware Kajia Msofe, Lianxi Sheng, Zhenxin Li, James Lyimo. Impact of Land Use/Cover Change on Ecosystem Service Values in the Kilombero Valley Floodplain, Southeastern Tanzania. Forests. 2020; 11 (1):109.
Chicago/Turabian StyleNangware Kajia Msofe; Lianxi Sheng; Zhenxin Li; James Lyimo. 2020. "Impact of Land Use/Cover Change on Ecosystem Service Values in the Kilombero Valley Floodplain, Southeastern Tanzania." Forests 11, no. 1: 109.
Red mud is a waste generated from the aluminum industry in large quantities. The potential of red mud as a sorbent for beneficial reuse has been the focus of research efforts. However, the limited sorption capacity of red mud has hindered its applications in the removal of environmental pollutants. In this study, the feasibility of heat treatment in improving the sorption of toxic Cd(II) by red mud was investigated in the temperature range of 200–900 °C. Heat treatment at 500 °C resulted in the highest sorption capacity (42.64 mg g−1) and the fastest sorption rate. Further analyses revealed that heat treatment at 500 °C led to significant increases in specific surface area (32.77 m2 g−1), which likely contributed to the enhanced Cd(II) sorption performance. Notably, heat treatment at 500 °C nearly doubled Cd(II) sorption stability as compared with that of raw red mud, as demonstrated by leaching experiments with simulated rainwater. Sequential extraction and XPS analyses indicated that specific sorption was the predominant mechanism involved in Cd(II) removal by red mud heat-treated at 500 °C (RM500). The strength of specific sorption following heat treatment likely contributed to the increase in sorption stability due to the formation of inner-sphere complex (–OCdOH). Metal-metal ion exchange was identified as another sorption mechanism, which, however, likely had only a limited effect on Cd(II) sorption performance. As the final pH (6.57) of the sorption system was typically lower than the pHPZC (about 10.6) of RM500, positive charges would develop on the red mud surface and impede the retention of Cd(II) cations, resulting in weak electrostatic attraction between Cd(II) cations and red mud. In summary, heat treatment at 500 °C considerably enhanced the capacity, rate and stability of Cd(II) sorption by red mud, suggesting red mud could be optimized by heat treatment as a more effective sorbent for Cd(II) removal. These findings represent the first mechanistic characterization of Cd(II) sorption by heat-treated red mud, providing much needed insights into the potential strategies to enhance the effectiveness of red mud in the sorptive removal of toxic heavy metals.
Tianxue Yang; Yongfeng Wang; Lianxi Sheng; Chunguang He; Wei Sun; Qiang He. Enhancing Cd(II) sorption by red mud with heat treatment: Performance and mechanisms of sorption. Journal of Environmental Management 2019, 255, 109866 .
AMA StyleTianxue Yang, Yongfeng Wang, Lianxi Sheng, Chunguang He, Wei Sun, Qiang He. Enhancing Cd(II) sorption by red mud with heat treatment: Performance and mechanisms of sorption. Journal of Environmental Management. 2019; 255 ():109866.
Chicago/Turabian StyleTianxue Yang; Yongfeng Wang; Lianxi Sheng; Chunguang He; Wei Sun; Qiang He. 2019. "Enhancing Cd(II) sorption by red mud with heat treatment: Performance and mechanisms of sorption." Journal of Environmental Management 255, no. : 109866.
Anaerobic digestion (AD) is an important technology for the treatment of livestock and poultry manure. The optimal experimental conditions were studied, with deer manure as a fermentation material and mushroom residue as an inoculum. At the same time, methane production was increased by adding zeolite and changing the magnetic field conditions. The results showed that a 6% solid content was the best condition for producing methane. The optimal conditions for methane production were obtained by adding 35 g of mushroom residue to 80 g of deer manure at 35 °C. The addition of organic wastewater (OW) improved methane production. The result of improving the methane production factor showed that adding zeolite during the reaction process could increase the methane production rate. When the amount of zeolite was over 8% total solids (TSes), methane production could improve, but the rate decreased. Setting a different magnetic field strength in the AD environment showed that when the distance between the magnetic field and the reactor was 50 mm and the magnetic field strength was 10–50 mT, the methane production increment and the content of methane in the mixed gases increased.
Hanxi Wang; Jianling Xu; Lianxi Sheng; Xuejun Liu; Meihan Zong; Difu Yao; Wang; Xu; Liu; Zong; Yao. Anaerobic Digestion Technology for Methane Production Using Deer Manure Under Different Experimental Conditions. Energies 2019, 12, 1819 .
AMA StyleHanxi Wang, Jianling Xu, Lianxi Sheng, Xuejun Liu, Meihan Zong, Difu Yao, Wang, Xu, Liu, Zong, Yao. Anaerobic Digestion Technology for Methane Production Using Deer Manure Under Different Experimental Conditions. Energies. 2019; 12 (9):1819.
Chicago/Turabian StyleHanxi Wang; Jianling Xu; Lianxi Sheng; Xuejun Liu; Meihan Zong; Difu Yao; Wang; Xu; Liu; Zong; Yao. 2019. "Anaerobic Digestion Technology for Methane Production Using Deer Manure Under Different Experimental Conditions." Energies 12, no. 9: 1819.
Land use change (LUC) driven by human activities and natural factors has resulted in the global loss of native biodiversity and the alteration of ecological processes and services across different ecosystems. It is thus necessary to analyze the trends and driving factors that influence land use changes. In this study, moderate resolution Landsat images were freely downloaded from the United States Geological Survey (USGS) archives, analyzed using the random forest (RF) algorithm and mapped in ArcGIS 10.2 software to examine the LUC trends from 1990 to 2016 in the Kilombero valley floodplain (KVFP), Tanzania. Participatory rural appraisals (PRA) and household questionnaire surveys were used to assess the potential drivers of LUC. The results show that, from 1990 to 2016, the agricultural land and grassland increased by 11.3% and 13.3%, respectively, while the floodplain wetland area decreased from 4.6% in 1990 to 0.9% in 2016. Based on a questionnaire survey, the intensification of human activities was identified as the proximate driver while population growth, a growing market demand and price incentives for agricultural and forest products coupled with improved infrastructure and biophysical factors such as soil properties, climate variability and terrain characteristics were identified as the underlying drivers of LUC. However, there is interplay among these factors acting simultaneously as well as differently that influence land use changes. Based on these findings, future sustainable land management strategies should include the introduction of the alternative environmentally friendly sources of livelihood, such as beekeeping, the promotion of community participation and education on the importance of sustainable wetland management.
Nangware Msofe; Lianxi Sheng; James Lyimo. Land Use Change Trends and Their Driving Forces in the Kilombero Valley Floodplain, Southeastern Tanzania. Sustainability 2019, 11, 505 .
AMA StyleNangware Msofe, Lianxi Sheng, James Lyimo. Land Use Change Trends and Their Driving Forces in the Kilombero Valley Floodplain, Southeastern Tanzania. Sustainability. 2019; 11 (2):505.
Chicago/Turabian StyleNangware Msofe; Lianxi Sheng; James Lyimo. 2019. "Land Use Change Trends and Their Driving Forces in the Kilombero Valley Floodplain, Southeastern Tanzania." Sustainability 11, no. 2: 505.
Soil carbon and nutrients play vital roles in ecosystem services. Many previous studies documented carbon or nutrient accumulation and the relevant impacting factors, and emphasized the soil physical structure, especially soil aggregates, that might play a key role in grasslands or farmlands. Unfortunately, there is little known about the relationship between soil aggregates and nutrient sequestration in fens and which soil aggregate type contributes most strongly to the soil nutrient cycle in fens. In this study, we collected 180 soil samples from 3 sites and then tested the changes in soil nutrient contents and carbon sequestration rates based on soil aggregate fractions from a fen that has critical implications for temperate wetland ecosystems in Northeast China. This fen soil is obviously characterized with macroaggregate and microaggregate structures. For this soil, the mean weight diameter (MWD) ranged from 0.42 to 0.61 mm and the geometric mean diameter (GMD) ranged from 0.82 to 0.90 mm, and there were fluctuations for both MWD and GMD along with soil depth. The correlation analysis showed that macroaggregates were more closely related to carbon sequestration (p < 0.01) and stable soil microaggregates were important for nutrient conservation (p < 0.01) in this fen. The sequestration rates of carbon, nitrogen and phosphorus were 87.64 ± 10.88 gC m−2 yr−1, 3.43 ± 0.54 gN m−2 yr−1, and 0.17 ± 0.02 gP m−2 yr−1, respectively. Additionally, the characteristic stoichiometric balance was related to the aggregate size and there were four distinct intervals for both the C/N ratio and C/P ratio; three intervals were located in similar ranges for the C/N ratio and C/P ratio (12–14 cm, 20–22 cm, and 28–30 cm) which means three of these areas coincided with the C/P ratio that characterizes the phosphorus conversion intensity index. The findings indicate that soil aggregates play key roles in soil carbon sequestration and nutrient cycling within wetlands.
Mingzhi Lu; Mengyao Yang; Yurong Yang; Deli Wang; Lianxi Sheng. Soil carbon and nutrient sequestration linking to soil aggregate in a temperate fen in Northeast China. Ecological Indicators 2018, 98, 869 -878.
AMA StyleMingzhi Lu, Mengyao Yang, Yurong Yang, Deli Wang, Lianxi Sheng. Soil carbon and nutrient sequestration linking to soil aggregate in a temperate fen in Northeast China. Ecological Indicators. 2018; 98 ():869-878.
Chicago/Turabian StyleMingzhi Lu; Mengyao Yang; Yurong Yang; Deli Wang; Lianxi Sheng. 2018. "Soil carbon and nutrient sequestration linking to soil aggregate in a temperate fen in Northeast China." Ecological Indicators 98, no. : 869-878.
Habitat loss is a key factor affecting Siberian crane stopovers. The accurate calculation of water supply and effective water resource management schemes plays an important role in stopover habitat restoration for the Siberian crane. In this paper, the ecological water demand was calculated and corrected by developing a three-dimensional model. The results indicated that the calculated minimum and optimum ecological water demand values for the Siberian crane were 2.47 × 108 m3~3.66 × 108 m3 and 4.96 × 108 m3~10.36 × 108 m3, respectively, in the study area. After correction with the three-dimensional model, the minimum and optimum ecological water demand values were 3.75 × 108 m3 and 5.21 × 108 m3, respectively. A water resource management scheme was established to restore Siberian crane habitat. Continuous, area-specific and simulated flood water supply options based on water diversions were used to supply water. The autumn is the best season for area-specific and simulating flood water supply. These results can serve as a reference for protecting other waterbirds and restoring wetlands in semi-arid areas.
Haibo Jiang; Chunguang He; Wenbo Luo; Haijun Yang; Lianxi Sheng; Hongfeng Bian; Changlin Zou. Hydrological Restoration and Water Resource Management of Siberian Crane (Grus leucogeranus) Stopover Wetlands. Water 2018, 10, 1714 .
AMA StyleHaibo Jiang, Chunguang He, Wenbo Luo, Haijun Yang, Lianxi Sheng, Hongfeng Bian, Changlin Zou. Hydrological Restoration and Water Resource Management of Siberian Crane (Grus leucogeranus) Stopover Wetlands. Water. 2018; 10 (12):1714.
Chicago/Turabian StyleHaibo Jiang; Chunguang He; Wenbo Luo; Haijun Yang; Lianxi Sheng; Hongfeng Bian; Changlin Zou. 2018. "Hydrological Restoration and Water Resource Management of Siberian Crane (Grus leucogeranus) Stopover Wetlands." Water 10, no. 12: 1714.
Red mud as a waste material is produced in large quantities by the aluminum industry. Heat activation has been used to enhance sorption capacity of red mud for its beneficial reuse as an effective sorbent. In this study, heat-activated red mud (HARM) was investigated for its Cd(II) sorption capacity under various process conditions (Cd concentration, pH and contact time) using response surface methodology (RSM). Analysis with RSM identified pH as the most important process parameter. The positive correlation between higher pH and greater Cd(II) sorption was likely due to: (i) decreased proton competition with Cd(II) for sorption sites at higher pH; (ii) enhanced sorption via ion exchange by monovalent Cd species from hydrolysis at higher pH; and (iii) improved thermodynamics of sorption at higher pH as protons are being released as products. Further analysis indicated the sorption process was thermodynamically favorable with a negative change in Gibbs free energy. Additionally, the sorption process exhibited a positive change in enthalpy, indicative of endothermic nature of sorption; this is consistent with sorption increase at higher temperature. These findings provide needed insight into the mechanisms underlying Cd(II) sorption by HARM for more effective applications of heat-activated red mud as sorbents for Cd(II) removal.
Tianxue Yang; Lianxi Sheng; Yongfeng Wang; Kristen N. Wyckoff; Chunguang He; Qiang He. Characteristics of Cadmium Sorption by Heat-Activated Red Mud in Aqueous Solution. Scientific Reports 2018, 8, 13558 .
AMA StyleTianxue Yang, Lianxi Sheng, Yongfeng Wang, Kristen N. Wyckoff, Chunguang He, Qiang He. Characteristics of Cadmium Sorption by Heat-Activated Red Mud in Aqueous Solution. Scientific Reports. 2018; 8 (1):13558.
Chicago/Turabian StyleTianxue Yang; Lianxi Sheng; Yongfeng Wang; Kristen N. Wyckoff; Chunguang He; Qiang He. 2018. "Characteristics of Cadmium Sorption by Heat-Activated Red Mud in Aqueous Solution." Scientific Reports 8, no. 1: 13558.
Clogging is the most serious problem in the operation of subsurface flow constructed wetlands (SSF CWs) and is caused by the accumulation of solids in substrates. Study of the solids accumulation process can provide a more accurate reference for the management and maintenance of SSF CWs. In this study, an experimental vertical-flow constructed wetland system was recreated in the lab, and substrates with different depth were sampled through different operation time to reveal the spatial and temporal distribution of accumulated solids. During the study, particulates mainly accumulated through adsorption along the gravel surface. Therefore, the matrix could still provide sufficient space for the particles to pass through and be intercepted or adsorbed into the system at a constant rate. At the end of the study, an increasing number of large particles had been intercepted and were accumulated in the 0–2 cm layer of the matrix, indicating a significant decrease in the pore diameter at the top substrate layer. The spatial and temporal accumulation of substrate particulates during the study period was accurately simulated by first-order kinetics models, and the simulated results were in good agreement with measured values.
Mengyao Yang; Mingzhi Lu; Lianxi Sheng; Haitao Wu. Study of the spatial and temporal distribution of accumulated solids in an experimental vertical-flow constructed wetland system. Science of The Total Environment 2018, 628-629, 509 -516.
AMA StyleMengyao Yang, Mingzhi Lu, Lianxi Sheng, Haitao Wu. Study of the spatial and temporal distribution of accumulated solids in an experimental vertical-flow constructed wetland system. Science of The Total Environment. 2018; 628-629 ():509-516.
Chicago/Turabian StyleMengyao Yang; Mingzhi Lu; Lianxi Sheng; Haitao Wu. 2018. "Study of the spatial and temporal distribution of accumulated solids in an experimental vertical-flow constructed wetland system." Science of The Total Environment 628-629, no. : 509-516.
Naphthalene has been used worldwide as a commercial insecticide for decades, which when detected in the environment can have various negative effects on non-target organism, such as hepatotoxicity. However, the molecular mechanisms of how naphthalene acts to affect the liver in zebrafish (Danio rerio) remains unknown. In this study, we evaluated the potential toxic effects of naphthalene on livers in female adult zebrafish over a 21-day subacute exposure. Global hepatic gene expression was examined by microarrays and the results indicated the regulated genes were associated significantly with vital hepatic injury pathways and GO categories upon naphthalene exposure, such as disruptions in lipid metabolism, inflammatory response, and the carcinogenic processes. According to our observations of liver histology, nuclear enlargement as a potential indicator of cancers and hepatic lipometabolic disorder precisely were supported. The 96 h acute naphthalene tests on Tg(lysC:DsRed) and LiPan lines larvae revealed recruitment of neutrophils by the liver, as well as decreased liver size, which further confirmed hepatic inflammation response to naphthalene exposure. Thus, these findings advance the field of ecotoxicology by unveiling a new role of naphthalene as a leading cause of liver damage and provide potential biomarker-genes for environmental naphthalene monitoring.
Hongshan Chen; Lianxi Sheng; Zhiyuan Gong; Shaoguo Ru; Hongfeng Bian. Investigation of the molecular mechanisms of hepatic injury upon naphthalene exposure in zebrafish (Danio rerio). Ecotoxicology 2018, 27, 650 -660.
AMA StyleHongshan Chen, Lianxi Sheng, Zhiyuan Gong, Shaoguo Ru, Hongfeng Bian. Investigation of the molecular mechanisms of hepatic injury upon naphthalene exposure in zebrafish (Danio rerio). Ecotoxicology. 2018; 27 (6):650-660.
Chicago/Turabian StyleHongshan Chen; Lianxi Sheng; Zhiyuan Gong; Shaoguo Ru; Hongfeng Bian. 2018. "Investigation of the molecular mechanisms of hepatic injury upon naphthalene exposure in zebrafish (Danio rerio)." Ecotoxicology 27, no. 6: 650-660.