关键词: 长三角地区, 灰水足迹, 灰水足迹强度, 水污染程度, 经济发展, 协调发展

Abstract: Phosphorus pollution factor is added to the traditional measurement to measure the grey water footprint of each domain in the provinces(cities) of Yangtze river delta region from 2005 to 2017, and regression model is used to verify the relation between grey water footprint and GDP in the provinces (cities), in an attempt to explore a coordinated developing model of economy and water resources. Unlike the traditional measurement in which gross nitrogen and COD are the major pollution factors in agricultural grey water footprint, phosphorus has become the chief pollution source of agricultural grey water footprint in Yangtze river delta region. Grey water footprint shows a decreasing-increasing-decreasing trend in Jiangsu, Zhejiang and Anhui provinces from 2005 to 2017, continuously decreasing in Shanghai city. Water quality is generally improving in Yangtze river delta region along with an increased water resources use efficiency. There is a descending correlation curve of water quality and economic development in Shanghai, an upside-down N-shaped curve in Jiangsu and Anhui, and an upside-down U-shaped curve in Zhejiang. This study provides references for governments to adopt differentiated water pollution control measures through analysis of the relation of grey water footprint and economic development in Yangtze river delta region.

Key words: Yangtze river delta region, grey water footprint, grey water footprint intensity, water pollution degree, economic development, coordinated development