Study on Control Countermeasures of Agricultural Non-point Source Pollution in Lakeside Belt of Poyang Lake——Taking Duchang Section in the Lower Reaches of Poyang Lake as Example

[Objective] The aim was to study the control countermeasures of agricultural non-point source pollution in lakeside belt of Poyang Lake.[Method] The current situation of water quality of Poyang Lake was analyzed firstly,then the causes of agricultural non-point source pollution in Duchang section of Poyang Lake were studied,finally corresponding control countermeasures were put forward.[Result] Agricultural non-point source pollution in Duchang section of Poyang Lake was mainly related to the rapid development of pearl industry and livestock industry,aggravated soil erosion and excessive utilization of fertilizer.Based on analysis of current environmental situation and bearing capability of resources in Poyang Lake basin,agricultural non-point source pollution would be controlled through the reduction of external source pollution load,restoration of river wetland and construction of aquatic ecosystem.After the primary implementation of agricultural non-point source pollution control project,the amount of agricultural non-point source pollution in demonstration plot was reduced,and the quality of effluent met the first Class (Class A) of state Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).Meanwhile,biodiversity index in river wetland increased by about 30%,so the pollution load entering Poyang Lake was decreased.[Conclusion] The study could provide technology integration and demonstration for the environmental remediation in lakeside belt of Poyang Lake.

GIS-Based Empirical Research on Changes of Wuhan’s Lakeside Pattern

There is often a close spatial relationship between urban development and water bodies.Functionally,the relationship can also be in many forms:from water supply for human and industrial use to purely aesthetic functions.These relationships are all,in their own way,critical elements of the sustainability of urban development,making the careful management for water bodies and riparian areas of fundamental importance.This study quantifies the historical changes of urban development pattern in lakesides of 27 lakes located in Wuhan’s main urban area.Image data from 1989-2009 is used to analyze the spatial changes in a GIS environment.The study shows how the land development,such as urban construction,transportation and agricultural development have affected the riparian areas of these water bodies.It discloses objective laws governing the historical changes of Wuhan’s lakeside pattern,and the correlations among the laws to provide strong technical support and theoretical reference for the future integrated development and protection of Wuhan’s lakes and to present decision-making support for urban construction and management.

Dynamic Evolution and Driving Forces of the Changes in Lakeside Wetlands in the Mongolian Plateau

Rapid climate change and human disturbance have caused serious damage and shrinkage of the wetlands in the Mongolian Plateau,posing severe challenges to environmental development.Based on remote sensing images and DEM data,this study established a series of datasets for lakeside wetlands in the Mongolian Plateau in 2000,2010 and 2020,and investigated the dynamic evolution of lakeside wetlands in the Mongolian Plateau through spatial and temporal analyses.The results showed that in 2000,there were 564 lakes(>1 km^(2))in the Mongolian Plateau,with a total area of about 55216.47 km^(2).Compared with 2000,the area of lakes in 2010 was significantly reduced,and there was a significant increase in the number of woody marshes and a reduction in the number of herbaceous marshes.In 2020,the lakes in the central part of the Mongolian Plateau were smaller than in 2010.The areas of lakes in the western,southern and eastern regions were increasing,and the areas of herbaceous swamps,woody marshes and meadows were increasing overall.Lakes,bare land and saline-alkali land decreased overall.The degree of salinization was reduced over the study period.There was a significant correlation between the Adaptive Palmer Drought Index(scPDSI)and lake area.In the past two decades,the climatic factors and human activities of the Mongolian Plateau have profoundly affected the evolution of the lakeside wetlands.We should prioritize the protection of lakes and wetland resources in order to achieve the dynamic balance of wetland ecology.

Lakeside Respite

Taihu Lake is reason enough to visit Wuxi when the soft breezes blow, waves roll and the hills in the distance look like an overlapping landscape painting. Taihu Lake is the third largest freshwater lake in China. With a surface area of about 2。