Study On The Temporal And Spatial Evolution Characteristics Of Grey Water Footprint In Ganjiang River Basin

In the context of the world’s great development of the “Belt and Road” initiative,the economies of various countries have developed rapidly.Dependence on and demand for water resources have greatly increased.my country is a country with a very rich total amount of water resources and a country with a considerable shortage of water resources per capita.The acceleration of urbanization has continuously aggravated the contradiction between the supply and demand of water resources in my country.Poyang Lake is the largest freshwater lake in my country,but non-point source pollution has intensified in recent years.The concentration of nitrogen and phosphorus in the lake has been high for a long time,and the eutrophication status has continued to increase.The Ganjiang River Basin is the largest secondary basin in the Poyang Lake Basin,and its water quality will directly affect the water quality of Poyang Lake.Based on the related theories of water footprint and grey water footprint,explore the temporal and spatial evolution characteristics of grey water footprint in Ganjiang River Basin.In-depth analysis of water resources utilization status and existing problems in the Ganjiang River Basin and Poyang Lake Basin,sewage and wastewater discharge,and economic output efficiency,etc.,explore the relationship between water resources development and utilization and water environmental pollution,and analyze the utilization of water resources and gray water Footprint output efficiency relationship and driving factors.Get the following conclusions:(1)From 2008 to 2018,the overall water footprint of the Ganjiang River Basin increased first and then decreased.It shows that with the continuous development of the industrial economy in the Ganjiang River Basin,the continuous optimization of the industrial structure,the rapid development of industrial scale and other factors.The society continues to develop and progress,the level of technology such as watersaving facilities is constantly improved,and people’s awareness of environmental protection and water-saving is continuously strengthened.(2)The gray water footprint and per capita gray water footprint of the Ganjiang River Basin generally show a fluctuating state of first decline,then rise and fall.Affected by factors such as rainfall and total water consumption,the construction of water conservancy projects should be improved to give full play to the comprehensive advantages of water conservancy facilities in water storage and water transfer.(3)From the perspective of the geographical spatial distribution and composition characteristics of the gray water footprint in the Ganjiang River Basin,during the study period,the agricultural gray water footprint value of Ganzhou City and Yichun City was relatively large,while the agricultural gray water footprint value of Xinyu City and Pingxiang City was the smallest,and that of Ji’an City,Nanchang City’s agricultural grey water footprint value is in the middle position.Therefore,it is necessary to strengthen the training and guidance on the application of pesticides,fertilizers and other chemical substances in the agricultural production process to improve agricultural production efficiency,input-output rate and organic fertilizer application rate.(4)Economic factors and technical factors are the two most significant driving factors affecting the changes in the gray water footprint of the Ganjiang River Basin.Therefore,while developing the social economy,we must continue to upgrade the industrial revolution,optimize the industrial structure,develop green and efficient,and improve water use efficiency.