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Hongyu Liu
School of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China

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Journal article
Published: 26 July 2021 in Sustainability
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Ditch networks play crucial roles in regulating water fluxes with their surroundings. The connectivity of ditches can have great impacts on nutrient migration and transformations. However, connectivity patterns related to ditch networks have rarely been studied, especially the relationships with water quality assessed through spatial analysis. This paper considered ditch connectivity and water quality indicators comprehensively, using spatial autocorrelation and geographically weighted regression (GWR) models, to analyze the impact of ditch connectivity on water quality from urban to rural gradients. The results suggested that water quality in rural areas and towns was better than in suburbs and transition zones, and the different areas exhibited variable spatial ditch connectivity. The Moran’s I index of the connectivity indicators showed the clustering state of spatial distribution, with ditch connectivity explaining 61.06% of changes in water quality. The circularity and network connectivity of the ditches had the most influence on water quality. However, the degree of influence varied with region. Circularity had the greatest impact on water quality in urban areas, and network connectivity had the greatest impact on water quality in township areas. Therefore, future water improvement projects, based on ditch optimization and management, need to consider the more related influencing factors and their spatial differences.

ACS Style

Chunqi Qiu; Yufeng Li; Alan Wright; Cheng Wang; Jiayi Xu; Shiwei Zhou; Wanchun Huang; Yanhui Wu; Yinglei Zhang; Hongyu Liu. Spatial Effects of Urban-Rural Ditch Connectivity Gradient Changes on Water Quality to Support Ditch Optimization and Management. Sustainability 2021, 13, 8329 .

AMA Style

Chunqi Qiu, Yufeng Li, Alan Wright, Cheng Wang, Jiayi Xu, Shiwei Zhou, Wanchun Huang, Yanhui Wu, Yinglei Zhang, Hongyu Liu. Spatial Effects of Urban-Rural Ditch Connectivity Gradient Changes on Water Quality to Support Ditch Optimization and Management. Sustainability. 2021; 13 (15):8329.

Chicago/Turabian Style

Chunqi Qiu; Yufeng Li; Alan Wright; Cheng Wang; Jiayi Xu; Shiwei Zhou; Wanchun Huang; Yanhui Wu; Yinglei Zhang; Hongyu Liu. 2021. "Spatial Effects of Urban-Rural Ditch Connectivity Gradient Changes on Water Quality to Support Ditch Optimization and Management." Sustainability 13, no. 15: 8329.

Journal article
Published: 24 April 2021 in Science of The Total Environment
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The conservation level of rare waterbirds reflects the quality of the regional ecological environment and wetlands, and suitable habitat patches and good environmental conditions are bases to support the activities of rare species in habitats. Establishing these conditions is also an important goal of habitat landscape and functional restoration. However, lack of these conditions limits population protection and habitat restoration of rare species. Based on the random forest (RF) algorithm and threshold indicator taxa analysis (TITAN), this paper performed habitat suitability assessment and environmental variable threshold analysis of rare waterbird species in Yancheng coastal wetlands. The results showed that the suitable area proportion of three waterbird species at different habitat sites was less than 20%. The unsuitable area proportions of red-crowned cranes and oriental storks at the CA habitat site were the highest, reaching 86.73% and 85.17%, respectively. In addition, analysis of the importance of environmental variables showed that the main influencing variables affecting the suitable habitat distribution of the three rare waterbirds were habitat type (T_hab), habitat area (A_hab), vegetation coverage (P_fvc), distance to farmland (D_far), distance to reeds (D_ree), ponds density (Ponds), distance to water surface (D_wat) and distance to main roads or seawalls (D_swa). These variables covered the type, area, coverage and distance indicators. With the exception of D_far, Ponds and D_swa, rare waterbirds had response thresholds to each environmental indicator, and these results supported the restoration of landscape structure and function of each habitat site. This study emphasized the importance of foods, water resources and hidden conditions for habitat selection in rare waterbirds. Finally, we proposed the maintenance and restoration patterns of the landscape structure and function of rare waterbird habitats, which are available for other coastal tidal wetlands.

ACS Style

Cheng Wang; Hongyu Liu; Yufeng Li; Bin Dong; Chunqi Qiu; Jialing Yang; Ying Zong; Hao Chen; Yongqiang Zhao; Yanan Zhang. Study on habitat suitability and environmental variable thresholds of rare waterbirds. Science of The Total Environment 2021, 785, 147316 .

AMA Style

Cheng Wang, Hongyu Liu, Yufeng Li, Bin Dong, Chunqi Qiu, Jialing Yang, Ying Zong, Hao Chen, Yongqiang Zhao, Yanan Zhang. Study on habitat suitability and environmental variable thresholds of rare waterbirds. Science of The Total Environment. 2021; 785 ():147316.

Chicago/Turabian Style

Cheng Wang; Hongyu Liu; Yufeng Li; Bin Dong; Chunqi Qiu; Jialing Yang; Ying Zong; Hao Chen; Yongqiang Zhao; Yanan Zhang. 2021. "Study on habitat suitability and environmental variable thresholds of rare waterbirds." Science of The Total Environment 785, no. : 147316.

Journal article
Published: 15 December 2020 in Ecological Indicators
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In recent years, due to human activities and global climate change, the number and area of waterbird habitats in Yancheng coastal wetlands, a newly established world natural heritage site, have been shrinking, the function of the waterbird habitats has been degraded to varying degrees, and the safety of waterbird populations and habitats has been threatened. Therefore, in this study, waterbird habitat functions at the regional scale were assessed by using spatial principal component analysis (SPCA). According to the load matrix of principal components and the Redundancy analysis (RDA) method, the driving force of habitat function change and the mechanisms of their effects on waterbird guilds and diversity were revealed. The results showed that the areas of the highest and high habitat function grades continued to decline from 1987 to 2019, and the areas of the lowest and low grades of habitat function continued to increase. The overall habitat functions in the waterbird distribution areas were high, but the functional grades within different habitat sites were obviously decreasing. The main driving factors affecting habitat function change in Yancheng coastal wetlands from 1987 to 2019 were habitat types, habitat area, habitat diversity, habitat fragmentation, number of residential areas and reclamation intensity. The effects of these driving factors on the population diversity and distribution of waterbird guilds were different. Finally, countermeasures and suggestions for the functional maintenance and key node restoration of waterbird habitats in Yancheng coastal wetlands were proposed.

ACS Style

Cheng Wang; Gang Wang; Lingjun Dai; Hongyu Liu; Yufeng Li; Chunqi Qiu; Yi Zhou; Hao Chen; Bin Dong; Yongqiang Zhao; Yanan Zhang. Study on the effect of habitat function change on waterbird diversity and guilds in Yancheng coastal wetlands based on structure–function coupling. Ecological Indicators 2020, 122, 107223 .

AMA Style

Cheng Wang, Gang Wang, Lingjun Dai, Hongyu Liu, Yufeng Li, Chunqi Qiu, Yi Zhou, Hao Chen, Bin Dong, Yongqiang Zhao, Yanan Zhang. Study on the effect of habitat function change on waterbird diversity and guilds in Yancheng coastal wetlands based on structure–function coupling. Ecological Indicators. 2020; 122 ():107223.

Chicago/Turabian Style

Cheng Wang; Gang Wang; Lingjun Dai; Hongyu Liu; Yufeng Li; Chunqi Qiu; Yi Zhou; Hao Chen; Bin Dong; Yongqiang Zhao; Yanan Zhang. 2020. "Study on the effect of habitat function change on waterbird diversity and guilds in Yancheng coastal wetlands based on structure–function coupling." Ecological Indicators 122, no. : 107223.

Journal article
Published: 24 November 2020 in PeerJ
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Background The Yancheng coastal natural wetlands (YCNR) are well-preserved silty tidal flat wetlands in China. Due to the severe invasion of Spartina alterniflora, the native ecosystem has undergone great changes. The successful invasion of S. alterniflora reduced the biodiversity of the YCNR, changed the structure and function of the local ecosystem, and eventually led to the degradation of the ecosystem and the loss of ecosystem function and service. Fully understanding the impact of an alien species invasion on YCNR succession is an important prerequisite for protecting and restoring the wetlands. Methods In this study, remote sensing, GIS technology, and a cellular-automaton Markov model were used to simulate the natural succession process of native ecosystems without being affected by alien species. By comparing the landscape of the YCNR with the model simulation results, we gained a better understanding of how alien species affect native landscape-scale ecosystems. Results During the natural succession of the coastal native wetland ecosystem in the YCNR, the pioneer species S. alterniflora occupied the mudflats and expanded seaward. The whole area expanded and moved seaward with an average annual movement of 58.23 m. Phragmites australis seemed to dominate the competition with S. salsa communities, and the area gradually expanded with an average annual movement of 39.89 m. The invasion of S. alterniflora changed the native ecosystem’s spatial succession process, causing the S. salsa ecosystem to be stressed by ecosystems on the side of the sea (S. alterniflora) and that of land (P. australis). The area of the seaward-expanding P. australis ecosystem has been declining. Under a reasonable protected area policy, human activities have enhanced the succession rate of the P. australis ecosystem and have had a small impact on the ecological spatial succession of S. salsa and S. alterniflora.

ACS Style

Lingjun Dai; Hongyu Liu; Gang Wang; Cheng Wang; Ziru Guo; Yi Zhou; Yufeng Li. Modelling the effects of Spartina alterniflora invasion on the landscape succession of Yancheng coastal natural wetlands, China. PeerJ 2020, 8, e10400 .

AMA Style

Lingjun Dai, Hongyu Liu, Gang Wang, Cheng Wang, Ziru Guo, Yi Zhou, Yufeng Li. Modelling the effects of Spartina alterniflora invasion on the landscape succession of Yancheng coastal natural wetlands, China. PeerJ. 2020; 8 ():e10400.

Chicago/Turabian Style

Lingjun Dai; Hongyu Liu; Gang Wang; Cheng Wang; Ziru Guo; Yi Zhou; Yufeng Li. 2020. "Modelling the effects of Spartina alterniflora invasion on the landscape succession of Yancheng coastal natural wetlands, China." PeerJ 8, no. : e10400.

Journal article
Published: 07 June 2020 in Ecological Indicators
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In recent years, the suitable habitat for waterbirds in the Yancheng coastal wetlands has shown continuous degradation and decreasing dimensions. In this paper, the spatial distribution differences and main environmental variables of the suitable habitats for waterbird guilds were analyzed based on the field survey data and a random forest (RF) model. In addition, landscape indicators were adopted to study the structural differences in the landscape that were associated with suitable habitats for waterbird guilds. The results showed that the suitable habitats of low-sensitivity waterbirds were widely distributed, and suggested strong adaptive capacity to the environment. The area of suitable habitat for the four kinds of low-sensitivity waterbirds was obviously larger than that of high-sensitivity waterbirds. Among them, the area of heron habitat was the largest, covering 60% of the total area. From the perspective of the main environmental variables, habitat types (T_hab) and vegetation coverage (P_fvc) were the main variables affecting the spatial distribution of the eight waterbird guilds. There was a negative impact on the guilds when the coverage exceeded 70% (p < 0.05). From the perspective of landscape structure, the high-sensitivity waterbirds selected habitats with concentrated patch and strong connectivity, and the low-sensitivity waterbirds selected habitats with fragmented patches and diverse types. Based on the above analysis, spatial management patterns were proposed for the waterbird habitats.

ACS Style

Cheng Wang; Gang Wang; Lingjun Dai; Hongyu Liu; Yufeng Li; Yi Zhou; Hao Chen; Bin Dong; Shicheng Lv; Yongqiang Zhao. Diverse usage of waterbird habitats and spatial management in Yancheng coastal wetlands. Ecological Indicators 2020, 117, 106583 .

AMA Style

Cheng Wang, Gang Wang, Lingjun Dai, Hongyu Liu, Yufeng Li, Yi Zhou, Hao Chen, Bin Dong, Shicheng Lv, Yongqiang Zhao. Diverse usage of waterbird habitats and spatial management in Yancheng coastal wetlands. Ecological Indicators. 2020; 117 ():106583.

Chicago/Turabian Style

Cheng Wang; Gang Wang; Lingjun Dai; Hongyu Liu; Yufeng Li; Yi Zhou; Hao Chen; Bin Dong; Shicheng Lv; Yongqiang Zhao. 2020. "Diverse usage of waterbird habitats and spatial management in Yancheng coastal wetlands." Ecological Indicators 117, no. : 106583.

Journal article
Published: 06 June 2020 in Science of The Total Environment
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Effective conservation measures largely depend on knowledge of habitat selection of target species. Little is known about the scale characteristics and temporal rhythm of habitat selection of the endangered red-crowned crane, limiting the habitat conservation. Here, two red-crowned cranes were tracked with Global position system (GPS) for two years in Yancheng National Nature Reserve (YNNR). A multiscale approach was developed to identify the spatiotemporal pattern of habitat selection of red-crowned cranes. The results revealed that Red-crowned cranes preferred to select Scirpus mariqueter, ponds, Suaeda salsa, and Phragmites australis, and avoid Spartina alterniflora. In each season, habitat selection ratio for Scirpus mariqueter and ponds was the highest during the day and night, respectively. Further multiscale analysis showed that the percent coverage of Scirpus mariqueter at the 200-m to 500-m scale was the most important predictor for all habitat selection modeling, emphasizing the importance of restoring a large area of Scirpus mariqueter habitat for red-crowned crane population restoration. Additionally, other variables affect habitat selection at different scales, and their contributions vary with seasonal and circadian rhythm. Furthermore, habitat suitability was mapped to provide a direct basis for habitat management. The suitable area of daytime and nighttime habitat accounted for 5.4%–19.0% and 4.6%–10.2% of the study area, respectively, implying the urgency of restoration. The study highlighted the scale and temporal rhythms of habitat selection for various endangered species that depend on small habitats. The proposed multiscale approach applies to the restoration and management of habitats of various endangered species.

ACS Style

Gang Wang; Cheng Wang; Ziru Guo; Lingjun Dai; Yuqin Wu; Hongyu Liu; Yufeng Li; Hao Chen; Yanan Zhang; Yongxiang Zhao; Hai Cheng; Tianwu Ma; Fei Xue. A multiscale approach to identifying spatiotemporal pattern of habitat selection for red-crowned cranes. Science of The Total Environment 2020, 739, 139980 .

AMA Style

Gang Wang, Cheng Wang, Ziru Guo, Lingjun Dai, Yuqin Wu, Hongyu Liu, Yufeng Li, Hao Chen, Yanan Zhang, Yongxiang Zhao, Hai Cheng, Tianwu Ma, Fei Xue. A multiscale approach to identifying spatiotemporal pattern of habitat selection for red-crowned cranes. Science of The Total Environment. 2020; 739 ():139980.

Chicago/Turabian Style

Gang Wang; Cheng Wang; Ziru Guo; Lingjun Dai; Yuqin Wu; Hongyu Liu; Yufeng Li; Hao Chen; Yanan Zhang; Yongxiang Zhao; Hai Cheng; Tianwu Ma; Fei Xue. 2020. "A multiscale approach to identifying spatiotemporal pattern of habitat selection for red-crowned cranes." Science of The Total Environment 739, no. : 139980.

Journal article
Published: 15 May 2020 in Ecological Indicators
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Numerous studies have been conducted on current distribution and future changes of habitats by researchers from a range of disciplines such as ecology, biology, geography, environmental science, and agricultural science, among others. However, there is a lack of detailed studies on historical spatiotemporal dynamics of habitat, which can provide useful information for the conservation and management of endangered species habitats. Thus, we proposed an integrated framework to assess historical changes of habitat across space and time, as well as to analyze the driving mechanism based on Maxent model and landscape theory. Here, we collected Red-crowned crane records and environmental variables including climate, elevation, wind farm disturbance, land use and land cover (LULC) type and disturbance, and road disturbance at regional scale from 1984 to 2017. Our results suggested that there was a dramatic decline in habitat area, habitat suitability and habitat connectivity. LULC disturbance was the major driving factor leading to the decline, followed by LULC type and wind farm disturbance. Importantly, our results quantified LULC disturbance threshold, LULC type suitability, and range of wind farm impact, which served to propose specific recommendations for habitat restoration. Our approach highlighted the importance of integrating species distribution models and landscape ecology theory for conservation, hence was widely applicable to endangered species in the context of increasing human activities.

ACS Style

Gang Wang; Cheng Wang; Ziru Guo; Lingjun Dai; Yuqin Wu; Hongyu Liu; Yufeng Li; Hao Chen; Yanan Zhang; Yongxiang Zhao; Hai Cheng; Tianwu Ma; Fei Xue. Integrating Maxent model and landscape ecology theory for studying spatiotemporal dynamics of habitat: Suggestions for conservation of endangered Red-crowned crane. Ecological Indicators 2020, 116, 106472 .

AMA Style

Gang Wang, Cheng Wang, Ziru Guo, Lingjun Dai, Yuqin Wu, Hongyu Liu, Yufeng Li, Hao Chen, Yanan Zhang, Yongxiang Zhao, Hai Cheng, Tianwu Ma, Fei Xue. Integrating Maxent model and landscape ecology theory for studying spatiotemporal dynamics of habitat: Suggestions for conservation of endangered Red-crowned crane. Ecological Indicators. 2020; 116 ():106472.

Chicago/Turabian Style

Gang Wang; Cheng Wang; Ziru Guo; Lingjun Dai; Yuqin Wu; Hongyu Liu; Yufeng Li; Hao Chen; Yanan Zhang; Yongxiang Zhao; Hai Cheng; Tianwu Ma; Fei Xue. 2020. "Integrating Maxent model and landscape ecology theory for studying spatiotemporal dynamics of habitat: Suggestions for conservation of endangered Red-crowned crane." Ecological Indicators 116, no. : 106472.

Gmgda 2019
Published: 03 December 2019 in Arabian Journal of Geosciences
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Ecological niche modeling is particularly valuable for predicting the true and potential distribution of wild birds. The core zone of the Yancheng National Nature Reserve (YNNR) is the largest overwintering habitat of red-crowned cranes in the world. Based on a GF-2 image in 2015 and field data related to micro-habitats of cranes, five functional factors were selected and analyzed with maximum entropy (MaxEnt) and boosted regression tree (BRT) models. The prediction results of the MaxEnt and BRT algorithms reached outstanding levels. Landscape type was the most important environmental factor affecting the habitat quality of overwintering cranes, while distance to water sources was the least contributing factors in both models. The response curve of the BRT was more reasonable than the MaxEnt at explaining habitat selection and utilization by cranes. It revealed that superior habitats are principally distributed in Suaeda salsa in natural wetlands. This habitat currently faces serious fragmentation and islandization. This study evaluates the quality of overwintering habitat for red-crowned cranes based on ecological niche modeling. The results provide a scientific basis for the protection of the overwintering habitat of this species of crane, and it is critical for species protection and management planning of nature reserves.

ACS Style

Juan Wang; Hongyu Liu; Yufeng Li; Huabing Zhang. Habitat quality of overwintering red-crowned cranes based on ecological niche modeling. Arabian Journal of Geosciences 2019, 12, 750 .

AMA Style

Juan Wang, Hongyu Liu, Yufeng Li, Huabing Zhang. Habitat quality of overwintering red-crowned cranes based on ecological niche modeling. Arabian Journal of Geosciences. 2019; 12 (24):750.

Chicago/Turabian Style

Juan Wang; Hongyu Liu; Yufeng Li; Huabing Zhang. 2019. "Habitat quality of overwintering red-crowned cranes based on ecological niche modeling." Arabian Journal of Geosciences 12, no. 24: 750.

Journal article
Published: 15 October 2019 in Land Use Policy
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The coastal area of northern Jiangsu (CNJ) is the largest silt coastal zone along the western Pacific Coast. This area is a newly established world natural heritage site and is also the largest winter habitat for the red-crowned crane in the world. However, rapid economic development in the study area has led to great changes in the types and intensities of land-use, which has had an effect on the distribution of wintering red-crowned cranes. In this paper, we first analyzed land-use change and determined the spatiotemporal evolution of land-use types and intensities in the study area. Then, the distribution of the red-crowned cranes was analyzed over various years. Finally, a geographically weighted regression (GWR) model was adopted to study the spatial differences in the effects of land-use types and intensity changes on the distribution of the cranes. The results showed that salt marsh (p<0.01), salt field (p<0.05) and paddy field (p<0.05) were positively correlated with red-crowned cranes. Dry land (p<0.05), construction land (p<0.01) and aquaculture pond (p<0.05) were negatively correlated with red-crowned cranes. There was a strongly negative correlation between land-use intensity and the red-crowned cranes (p<0.01). These positive and negative factors had significant spatial heterogeneity. Given these differences and the current local economic and land policies, we proposed the concrete countermeasures for red-crowned crane habitat protection and established a “friendly” land-use pattern that is beneficial for the protection of the crane population and restoration of its habitat.

ACS Style

Cheng Wang; Gang Wang; Ziru Guo; Lingjun Dai; Hongyu Liu; Yufeng Li; Hao Chen; Yongxiang Zhao; Yanan Zhang; Hai Cheng. Effects of land-use change on the distribution of the wintering red-crowned crane (Grus japonensis) in the coastal area of northern Jiangsu Province, China. Land Use Policy 2019, 90, 104269 .

AMA Style

Cheng Wang, Gang Wang, Ziru Guo, Lingjun Dai, Hongyu Liu, Yufeng Li, Hao Chen, Yongxiang Zhao, Yanan Zhang, Hai Cheng. Effects of land-use change on the distribution of the wintering red-crowned crane (Grus japonensis) in the coastal area of northern Jiangsu Province, China. Land Use Policy. 2019; 90 ():104269.

Chicago/Turabian Style

Cheng Wang; Gang Wang; Ziru Guo; Lingjun Dai; Hongyu Liu; Yufeng Li; Hao Chen; Yongxiang Zhao; Yanan Zhang; Hai Cheng. 2019. "Effects of land-use change on the distribution of the wintering red-crowned crane (Grus japonensis) in the coastal area of northern Jiangsu Province, China." Land Use Policy 90, no. : 104269.

Journal article
Published: 26 March 2019 in Water
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Human use and management have a marked effect on wetland from different scales; it is necessary to develop a multi-scale integrated method to assess wetland conditions. So, this research aids the development of the wetland condition index (WCI) for humid regions of China by combining two main sub-indices: (i) the landscape development intensity index (LDI), which assesses human-dominated impacts; and (ii) the water environment index (WEI), which assesses changes in water quality and phytoplankton. We measured terrain and land use in the watersheds of wetlands using remote imaging data with geographic information systems (GIS) software. Also, we monitored the physical and chemical variables of the water bodies of 27 wetlands in urbanized and moderately urbanized areas in Nanjing City of China for this study. There were significant inconsistencies between the city’s level of development and the values of the WCI and its sub-indices. The WCI of urbanized areas was better than that for moderately urbanized areas, and the sub-indices LDI and WEI were only slightly correlated. In other words, wetlands with a low LDI value did not necessarily have a low water environment index value. Due to wetland restoration and human management activities, integrating the LDI and WEI is increasingly necessary for wetlands in urbanized areas than for moderately urbanized areas. This method could guide the design of wetlands to optimize their qualities and benefits to residents and reinforce wetland conservation.

ACS Style

Gang Wang; Yufeng Li; Hongyu Liu; Alan L. Wright. Development of the Wetland Condition Index (WCI) by Combining the Landscape Development Intensity Index (LDI) and the Water Environment Index (WEI) for Humid Regions of China. Water 2019, 11, 620 .

AMA Style

Gang Wang, Yufeng Li, Hongyu Liu, Alan L. Wright. Development of the Wetland Condition Index (WCI) by Combining the Landscape Development Intensity Index (LDI) and the Water Environment Index (WEI) for Humid Regions of China. Water. 2019; 11 (3):620.

Chicago/Turabian Style

Gang Wang; Yufeng Li; Hongyu Liu; Alan L. Wright. 2019. "Development of the Wetland Condition Index (WCI) by Combining the Landscape Development Intensity Index (LDI) and the Water Environment Index (WEI) for Humid Regions of China." Water 11, no. 3: 620.

Journal article
Published: 26 October 2018 in Eurasian Journal of Forest Science
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ACS Style

Juan Wang; Yufeng Li; Hongyu Liu. Effects of landscape evolution stages on soil properties distribution in Yancheng National Nature Reserve, China. Eurasian Journal of Forest Science 2018, 6, 15 -24.

AMA Style

Juan Wang, Yufeng Li, Hongyu Liu. Effects of landscape evolution stages on soil properties distribution in Yancheng National Nature Reserve, China. Eurasian Journal of Forest Science. 2018; 6 (3):15-24.

Chicago/Turabian Style

Juan Wang; Yufeng Li; Hongyu Liu. 2018. "Effects of landscape evolution stages on soil properties distribution in Yancheng National Nature Reserve, China." Eurasian Journal of Forest Science 6, no. 3: 15-24.

Article
Published: 23 October 2017 in Environmental Monitoring and Assessment
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Severe particulate matter (PM, including PM2.5 and PM10) pollution frequently impacts many cities in the Yangtze River Delta (YRD) in China, which has aroused growing concern. In this study, we examined the associations between relative humidity (RH) and PM pollution using the equal step-size statistical method. Our results revealed that RH had an inverted U-shaped relationship with PM2.5 concentrations (peaking at RH = 45–70%), and an inverted V-shaped relationship (peaking at RH = 40 ± 5%) with PM10, SO2, and NO2. The trends of polluted-day number significantly changed at RH = 70%. The very-dry (RH < 45%), dry (RH = 45–60%) and low-humidity (RH = 60–70%) conditions positively affected PM2.5 and exerted an accumulation effect, while the mid-humidity (RH = 70–80%), high-humidity (RH = 80–90%), and extreme-humidity (RH = 90–100%) conditions played a significant role in reducing particle concentrations. For PM10, the accumulation and reduction effects of RH were split at RH = 45%. Moreover, an upward slope in the PM2.5/PM10 ratio indicated that the accumulation effects from increasing RH were more intense on PM2.5 than on PM10, while the opposite was noticed for the reduction effects. Secondary transformations from SO2 and NO2 to sulfate and nitrate were mainly responsible for PM2.5 pollution, and thus, controlling these precursors is effective in mitigating the PM pollution in the YRD, especially during winter. The conclusions in this study will be helpful for regional air-quality management.

ACS Style

Cairong Lou; Hongyu Liu; Yufeng Li; Yan Peng; Juan Wang; Lingjun Dai. Relationships of relative humidity with PM2.5 and PM10 in the Yangtze River Delta, China. Environmental Monitoring and Assessment 2017, 189, 582 .

AMA Style

Cairong Lou, Hongyu Liu, Yufeng Li, Yan Peng, Juan Wang, Lingjun Dai. Relationships of relative humidity with PM2.5 and PM10 in the Yangtze River Delta, China. Environmental Monitoring and Assessment. 2017; 189 (11):582.

Chicago/Turabian Style

Cairong Lou; Hongyu Liu; Yufeng Li; Yan Peng; Juan Wang; Lingjun Dai. 2017. "Relationships of relative humidity with PM2.5 and PM10 in the Yangtze River Delta, China." Environmental Monitoring and Assessment 189, no. 11: 582.

Journal article
Published: 22 September 2016 in International Journal of Environmental Research and Public Health
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Recent studies in PM2.5 sources show that anthropogenic emissions are the main contributors to haze pollution. Due to their essential roles in establishing policies for improving air quality, socioeconomic drivers of PM2.5 levels have attracted increasing attention. Unlike previous studies focusing on the annual PM2.5 concentration (Cyear), this paper focuses on the accumulation phase of PM2.5 during the pollution episode (PMAE) in the Yangtze River Delta in China. This paper mainly explores the spatial variations of PMAE and its links to the socioeconomic factors using a geographical detector and simple linear regression. The results indicated that PM2.5 was more likely to accumulate in more developed cities, such as Nanjing and Shanghai. Compared with Cyear, PMAE was more sensitive to socioeconomic impacts. Among the twelve indicators chosen for this study, population density was an especially critical factor that could affect the accumulation of PM2.5 dramatically and accounted for the regional difference. A 1% increase in population density could cause a 0.167% rise in the maximal increment and a 0.214% rise in the daily increase rate of PM2.5. Additionally, industry, energy consumption, and vehicles were also significantly associated with PM2.5 accumulation. These conclusions could serve to remediate the severe PM2.5 pollution in China.

ACS Style

Cai-Rong Lou; Hong-Yu Liu; Yu-Feng Li. Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China. International Journal of Environmental Research and Public Health 2016, 13, 928 .

AMA Style

Cai-Rong Lou, Hong-Yu Liu, Yu-Feng Li. Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China. International Journal of Environmental Research and Public Health. 2016; 13 (10):928.

Chicago/Turabian Style

Cai-Rong Lou; Hong-Yu Liu; Yu-Feng Li. 2016. "Socioeconomic Drivers of PM2.5 in the Accumulation Phase of Air Pollution Episodes in the Yangtze River Delta of China." International Journal of Environmental Research and Public Health 13, no. 10: 928.

Journal article
Published: 01 February 2013 in Huan jing ke xue= Huanjing kexue
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ACS Style

Hua-Bing Zhang; Hong-Yu Liu; Yu-Feng Li; Jing An; Xing-Yu Xue; Ming-Hang Hou. [Spatial variation of soil moisture/salinity and the relationship with vegetation under natural conditions in Yancheng coastal wetland]. Huan jing ke xue= Huanjing kexue 2013, 34, 1 .

AMA Style

Hua-Bing Zhang, Hong-Yu Liu, Yu-Feng Li, Jing An, Xing-Yu Xue, Ming-Hang Hou. [Spatial variation of soil moisture/salinity and the relationship with vegetation under natural conditions in Yancheng coastal wetland]. Huan jing ke xue= Huanjing kexue. 2013; 34 (2):1.

Chicago/Turabian Style

Hua-Bing Zhang; Hong-Yu Liu; Yu-Feng Li; Jing An; Xing-Yu Xue; Ming-Hang Hou. 2013. "[Spatial variation of soil moisture/salinity and the relationship with vegetation under natural conditions in Yancheng coastal wetland]." Huan jing ke xue= Huanjing kexue 34, no. 2: 1.

Journal article
Published: 01 January 2013 in Geo-information Science
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ACS Style

Cong Wang; Hongyu Liu; Minghang Hou; Qingmei Tan. Classification Method of Muddy Tidal Flat Wetlands Based on Remote Sensing. Geo-information Science 2013, 15, 1 .

AMA Style

Cong Wang, Hongyu Liu, Minghang Hou, Qingmei Tan. Classification Method of Muddy Tidal Flat Wetlands Based on Remote Sensing. Geo-information Science. 2013; 15 (4):1.

Chicago/Turabian Style

Cong Wang; Hongyu Liu; Minghang Hou; Qingmei Tan. 2013. "Classification Method of Muddy Tidal Flat Wetlands Based on Remote Sensing." Geo-information Science 15, no. 4: 1.

Journal article
Published: 01 December 2012 in International Journal on Smart Sensing and Intelligent Systems
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ACS Style

He-Bing Hu; Hong-Yu Liu; Jing-Feng Hao; Jing An. ANALYSIS OF LAND USE CHANGE CHARACTERISTICS BASED ON REMOTE SENSING AND GIS IN THE JIUXIANG RIVER WATERSHED. International Journal on Smart Sensing and Intelligent Systems 2012, 5, 811 -823.

AMA Style

He-Bing Hu, Hong-Yu Liu, Jing-Feng Hao, Jing An. ANALYSIS OF LAND USE CHANGE CHARACTERISTICS BASED ON REMOTE SENSING AND GIS IN THE JIUXIANG RIVER WATERSHED. International Journal on Smart Sensing and Intelligent Systems. 2012; 5 (4):811-823.

Chicago/Turabian Style

He-Bing Hu; Hong-Yu Liu; Jing-Feng Hao; Jing An. 2012. "ANALYSIS OF LAND USE CHANGE CHARACTERISTICS BASED ON REMOTE SENSING AND GIS IN THE JIUXIANG RIVER WATERSHED." International Journal on Smart Sensing and Intelligent Systems 5, no. 4: 811-823.

Journal article
Published: 01 July 2012 in Huan jing ke xue= Huanjing kexue
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Jing-Feng Hao; Hong-Yu Liu; He-Bing Hu; Jing An; Xiao-Hong Zhang. [Responses of wetland water quality to influence the strengthness of urbanization in Nanjing, China]. Huan jing ke xue= Huanjing kexue 2012, 33, 1 .

AMA Style

Jing-Feng Hao, Hong-Yu Liu, He-Bing Hu, Jing An, Xiao-Hong Zhang. [Responses of wetland water quality to influence the strengthness of urbanization in Nanjing, China]. Huan jing ke xue= Huanjing kexue. 2012; 33 (7):1.

Chicago/Turabian Style

Jing-Feng Hao; Hong-Yu Liu; He-Bing Hu; Jing An; Xiao-Hong Zhang. 2012. "[Responses of wetland water quality to influence the strengthness of urbanization in Nanjing, China]." Huan jing ke xue= Huanjing kexue 33, no. 7: 1.

Journal article
Published: 01 March 2012 in Huan jing ke xue= Huanjing kexue
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He-Bing Hu; Hong-Yu Liu; Jing-Feng Hao; Jing An. [Influence of spatial difference on water quality in Jiuxiang River watershed, Nanjing]. Huan jing ke xue= Huanjing kexue 2012, 33, 1 .

AMA Style

He-Bing Hu, Hong-Yu Liu, Jing-Feng Hao, Jing An. [Influence of spatial difference on water quality in Jiuxiang River watershed, Nanjing]. Huan jing ke xue= Huanjing kexue. 2012; 33 (3):1.

Chicago/Turabian Style

He-Bing Hu; Hong-Yu Liu; Jing-Feng Hao; Jing An. 2012. "[Influence of spatial difference on water quality in Jiuxiang River watershed, Nanjing]." Huan jing ke xue= Huanjing kexue 33, no. 3: 1.

English abstract
Published: 01 February 2012 in Huan jing ke xue= Huanjing kexue
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Yu-Feng Li; Hong-Yu Liu; Jing-Feng Hao; Nan Zheng; Xiao Cao. [A quantitative method and case analysis for assessing water health]. Huan jing ke xue= Huanjing kexue 2012, 33, 1 .

AMA Style

Yu-Feng Li, Hong-Yu Liu, Jing-Feng Hao, Nan Zheng, Xiao Cao. [A quantitative method and case analysis for assessing water health]. Huan jing ke xue= Huanjing kexue. 2012; 33 (2):1.

Chicago/Turabian Style

Yu-Feng Li; Hong-Yu Liu; Jing-Feng Hao; Nan Zheng; Xiao Cao. 2012. "[A quantitative method and case analysis for assessing water health]." Huan jing ke xue= Huanjing kexue 33, no. 2: 1.

Journal article
Published: 01 January 2012 in Geo-information Science
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Hebing Hu; Hongyu Liu; Jingfeng Hao; Jing An. Spatial Heterogeneity of Land Use Degree in Jiuxiang River Watershed,Nanjing City,China. Geo-information Science 2012, 14, 1 .

AMA Style

Hebing Hu, Hongyu Liu, Jingfeng Hao, Jing An. Spatial Heterogeneity of Land Use Degree in Jiuxiang River Watershed,Nanjing City,China. Geo-information Science. 2012; 14 (5):1.

Chicago/Turabian Style

Hebing Hu; Hongyu Liu; Jingfeng Hao; Jing An. 2012. "Spatial Heterogeneity of Land Use Degree in Jiuxiang River Watershed,Nanjing City,China." Geo-information Science 14, no. 5: 1.