Temporal and spatial evolution of non-point source pollution of chemical fertilizer in main grain producing areas of China
In order to reveal the temporal and spatial characteristics of non-point source pollution emissions of chemical fertilizer in main grain producing areas,to ensure China's food security,and to verify the effectiveness of"action plan for zero-growth in chemical fertilizer application",based on the data of 13 main grain producing provinces in China from 2000 to 2020,the temporal and spatial evolution characteristics of non-point source pollution of chemical fertilizer in main grain production areas and driving factors were analyzed by using fertilizer loss coefficient method,standard deviation ellipse method and LMDI decomposition method.The results show that:1)During the investigation period,both the total amount and intensity of agricultural chemical fertilizer non-point source pollution in the main grain-producing provinces showed an inverted U-shaped trend,and the total amount of chemical fertilizer non-point source emissions reached a peak in 2015,at 3.7672 million tons.Major grain-producing provinces have achieved the goal of zero growth in chemical fertilizer application.2)Provinces with higher total non-point source emissions and emission intensity from chemical fertilizers are mainly distributed in the Jiangsu,Shandong provinces and surrounding provinces,and there is a certain degree of spatial aggregation characteristics.3)The concentration of total non-point source emissions of fertilizers has shifted from Jinan to Tai'an in major grain-producing provinces.The hotspots have been expanding to the northeast,while the intensity concentration of non-point source pollution has been maintained in Tai'an,the total amount and intensity of non-point source pollution were concentrated in the direction of southwest-northeast.4)The enlargement of planting scale and the output effect all aggravated the non-point source pollution of chemical fertilizer.Therefore,we should balance the relationship between economic benefits and non-point source pollution,vigorously develop green planting technology,take the control strategies such as adaptation measures to local condition,jointly preventing and controlling the excessive fertilizer application.
major grain producing provincenon-point source pollutionspatio-temporal evolutiondriving factors
NETL
NSTL
万方数据
