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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.

Research article
Published: 06 July 2020 in Environmental Science and Pollution Research
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Small geographically isolated ponds provide a multitude of ecological functions and services, but water table fluctuations alter the magnitude of these services. Understanding temporal and spatial changes of surface water levels in the watershed, and their spatial variability, is critical for restoration and protection of small ponds. A biweight spatial consistency test was employed to quantify the seasonal variability of surface water tables for 50 ponds and hydrological connectivity models, and land use metrics, topographic characteristics, and irrigation needs, for groundwater, were introduced into the model to identify influencing factors. The spatial difference of water level changes in the rice season was greater than the wheat season while water table increased in the wheat season and declined in the rice season. Continuous runoff with complete surface hydrological connectivity of ponds, which was strongly related to precipitation, occurred only one time during the study period. Water level dynamics were largely uncorrelated to surface hydrological connectivity but were linked to watershed and pond size. By evaluating irrigation water requirements, irrigation was a primary human management factor affecting the water table changes in ponds. Groundwater also enriched influence factors that estimated water level variation in ponds, and these results will provide support for improved water resource management and ponds protection purposes.

ACS Style

Yufeng Li; Yuqin Wu; Alan Wright; Jiayi Xu; Hongyu Liu; Gang Wang; Cheng Wang. Integrated factor analysis of water level variation in geographically isolated ponds. Environmental Science and Pollution Research 2020, 27, 38861 -38870.

AMA Style

Yufeng Li, Yuqin Wu, Alan Wright, Jiayi Xu, Hongyu Liu, Gang Wang, Cheng Wang. Integrated factor analysis of water level variation in geographically isolated ponds. Environmental Science and Pollution Research. 2020; 27 (31):38861-38870.

Chicago/Turabian Style

Yufeng Li; Yuqin Wu; Alan Wright; Jiayi Xu; Hongyu Liu; Gang Wang; Cheng Wang. 2020. "Integrated factor analysis of water level variation in geographically isolated ponds." Environmental Science and Pollution Research 27, no. 31: 38861-38870.

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: 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: 30 November 2018 in Agriculture, Ecosystems & Environment
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Revealing the relationship beween land use patterns and pond water quality is helpful to make water resource management decisions and improve agricultural pollution at the watershed scale. However, there is uncertainty about how irrigation and fertilization affect land use-water relationships. This study used a self-organizing map method to classify 51 created ponds and examined how land use pattern indices relateto pond water quality by identifying the variables in different clusters. The influence of irrigation and fertilization on water-land use associations were further explored. The self-organizing map classified ponds into five clusters, from least to most nutrient rich, with different variables of land use in clusters. Water quality improved as the percentage of pond surface area in the watershed increased, and decreased as farmland proportion increased. Land use patterns, such as patch density and ditch density, actually affected concentrations of chlorophyll a in pond water. Regardless of wheat or rice season, the weakening effects of fertilization and irrigation on land use-water relationships occurred among most ponds clusters. Irrigation and fertilization in the wheat season had more influence on water and land use relationships than in the rice season. Based on these results, water resource protection regulations should consider similar pond conditions within land use of watersheds to optimize mitigation strategies for different land-use characteristics and seasonal variation.

ACS Style

Yufeng Li; Alan Wright; Hongyu Liu; Juan Wang; Gang Wang; Yuqing Wu; Lingjun Dai. Land use pattern, irrigation, and fertilization effects of rice-wheat rotation on water quality of ponds by using self-organizing map in agricultural watersheds. Agriculture, Ecosystems & Environment 2018, 272, 155 -164.

AMA Style

Yufeng Li, Alan Wright, Hongyu Liu, Juan Wang, Gang Wang, Yuqing Wu, Lingjun Dai. Land use pattern, irrigation, and fertilization effects of rice-wheat rotation on water quality of ponds by using self-organizing map in agricultural watersheds. Agriculture, Ecosystems & Environment. 2018; 272 ():155-164.

Chicago/Turabian Style

Yufeng Li; Alan Wright; Hongyu Liu; Juan Wang; Gang Wang; Yuqing Wu; Lingjun Dai. 2018. "Land use pattern, irrigation, and fertilization effects of rice-wheat rotation on water quality of ponds by using self-organizing map in agricultural watersheds." Agriculture, Ecosystems & Environment 272, no. : 155-164.

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: 31 December 2010 in Procedia Environmental Sciences
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An ecological survey was carried out to determine the water body concentrations of nutrients and its factors in Xixi National Wetland Park, China. According to the intensities of human activities, water body was classified into natural ponds, ornamental ponds, natural creeks and sight-seeing creeks. Based on calculated Trophic State Index (TSI), we can get conclusion that the trophic status of different water body types all exceeded the eutrophic level in the Xixi National Wetland Park. The natural creeks showed the highest TSI, followed by ornamental ponds, sight-seeing creeks and natural ponds, suggesting that natural creeks should be considered as priority sites for the implementation of water quality improvement. The main factors for trophic status in Xixi Wetland Park were discussed using canonical correspondence analysis (CCA) and multiple linear regression analysis (MLR). As a result, the trophic states in ponds were mainly controlled by hydrophyte cover. The trophic states in creeks made great relation to creek width and water quality of inflows. So we can find that human management can improve water quality by planting macrophytes of wetlands and controlling sewage water inflows from surrounding areas.

ACS Style

Yufeng Li; Hongyu Liu; Nan Zheng; Xiao Cao. Analysis of Trophic Status and its Influence Factors of Different Water Body Types in Xixi National Wetland Park, China. Procedia Environmental Sciences 2010, 2, 768 -780.

AMA Style

Yufeng Li, Hongyu Liu, Nan Zheng, Xiao Cao. Analysis of Trophic Status and its Influence Factors of Different Water Body Types in Xixi National Wetland Park, China. Procedia Environmental Sciences. 2010; 2 ():768-780.

Chicago/Turabian Style

Yufeng Li; Hongyu Liu; Nan Zheng; Xiao Cao. 2010. "Analysis of Trophic Status and its Influence Factors of Different Water Body Types in Xixi National Wetland Park, China." Procedia Environmental Sciences 2, no. : 768-780.