Study on the Impact of Land Use Change on Non-point Source Pollution Loads:A Case Study of the Control Area of Huazhou Station in the Jianjiang River Basin
Different land use types have great influence on the non-point source pollution load.To investigate the impact of land use changes on non-point source pollution loads,this paper takes the control area of Huazhou Station in Jianjiang Basin as the research object,the SWAT model is used for simulation research,the spatial and temporal distribution characteristics of nitrogen and phosphorus under three land use scenarios were revealed by simulating and analyzing the changes of nitrogen and phosphorus pollution loads.The results show that:① The R2 values for runoff,total nitrogen and total phosphorus were greater than 0.6,NSE was greater than 0.5,and PBIAS was less than 25%,during the calibration and validation periods,which accurately simulated the processes of runoff,total nitrogen and total phosphorus in the basin.②Compared with other scenarios,the load intensity of total nitrogen and total phosphorus in scenario 2 is the lowest,with an average annual load of 16 451.42 t and 4 642.72 t,respectively,and the annual load intensity was closely related to rainfall,indicating that agricultural land is the key area for controlling non-point source pollution in the basin,and the rainy season is the key period for control.③ In the future land use planning of this region,it is essential to minimize the occupation of forest land,and at the same time reduce the output of nitrogen and phosphorus from agricultural land by adjusting planting structure and implementing protective measures.This study can provide research ideas for land use and pollutant control,and provide theoretical support for protecting and improving the water environment and water quality in the basin.
Jianjiang River BasinSWAT modelland usenon-point source pollutionspatiotemporal distribution
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