基于InVEST模型的河南省农田氮素面源污染时空模拟OA北大核心CSTPCD

[Objective]The objective of this study is to simulate nitrogen non-point source pollution in farmland,unraveling its spatio-temporal distribution characteristics and influencing factors.The ulti-mate aim is to enable efficient control of non-point source pollution and foster agricultural ecological protection.[Method]The research meticulously categorizes land use units in Henan Province,consid-ering factors like agricultural zoning,terrain,planting patterns,cropping systems,and land cover.Le-veraging the In VEST model,a temporal and spatial simulation of nitrogen non-point source pollution in farmland across Henan Province is conducted for the years 2000,2010,and 2020.The analysis then extends to both output loads and influencing factors.[Result]The total nitrogen output load and nitro-gen emission intensity in the majority of cities within Henan Province exhibited a consistent pattern,characterized by an initial increase followed by a subsequent decrease.Notable disparities were evident among different cities,with Nanyang,Xinyang,and Zhumadian identified as regions manifesting high nitrogen emission intensity.A significant correlation was established between nitrogen output intensity and several factors including average nitrogen application,digital elevation model(DEM),rainfall,proportion of farmland,and slope.Partial correlation analysis underscored a close association between nitrogen output intensity,nitrogen application per site,and rainfall.The outcomes of nitrogen emission intensity classification delineated specific medium and high-intensity emission zones within the cities of Nanyang,Xinyang,and Zhumadian.[Conclusion]The identification of regions with high emission in-tensity in farmland non-point source pollution within Henan Province,alongside the influential factors discovered,offers critical insights to enhance strategies for preventing and controlling nitrogen non-point source pollution in these areas.