Spatial-temporal characteristics and influencing factors of non-point source pollution of chemical fertilizers in China:based on provincial panel data from 1997 to 2020
The problem of non-point source pollution of chemical fertilizers is related to the green development of ag-riculture and the revitalization of rural ecology.Based on the provincial panel data from 1997 to 2020,the emission intensity of non-point source pollution of chemical fertilizers was measured.The Kernel density estimation,Markov chain analysis,Theil index,two-way fixed effect model and other methods were adopted to explore the spatial-tempo-ral characteristics and influencing factors of non-point source pollution of chemical fertilizers in China.The results showed that,the emission intensity of non-point source pollution of chemical fertilizers in China was increasing at first and then decreasing.Taking the year of 2015 as the dividing point,the trend of emission intensity of non-point source pollution of chemical fertilizer shifting to a low level gradually appeared,but it was still stable to maintain the original level,and it was difficult to achieve leapfrog reduction.During the sample period,the emission intensity of non-point source pollution of chemical fertilizers showed a spatial distribution pattern of"high in the east and low in the west,high in the south and low in the north".The intra-regional difference was the main source of the overall difference.Nine factors,such as the level of financial support for agriculture,the level of agricultural economic growth and rural human capital,affected the emission intensity of non-point source pollution of chemical fertilizers.Therefore,it is necessary not only to formulate differentiated pollution control measures,but also to strengthen coop-eration in pollution control among provincial administrative regions.Meanwhile,it is important to expand the path of fertilizer reduction and efficiency increase in order to promote greener agricultural development in all respects.
non-point source pollution of chemical fertilizeremission intensityspatial-temporal characteristicin-fluencing factorpollution control
NETL
NSTL
万方数据
