摘要
Abstract
[Objective]The temporal and spatial variations in the soil and water conservation service functions in Hunan Province were explored,in order to provide a scientific basis for evaluating these functions and formulating a regional ecological management plan.[Methods]Three factors of net primary productivity(NPP)of vegetation,digital elevation model elevation,and soil texture distribution were selected,and the spatial and temporal distribution characteristics of soil and water conservation service functions in Hunan Province were studied based on ArcGIS for the years 2000,2005,2010,2015,and 2020 using the NPP quantitative index evaluation model.[Results]① From 2000 to 2020,the average net primary productivity of vegetation in Hunan Province ranged from 4.39 to 334.52 g/(m2·a)(calculated by C),showing an upward trend over time.Spatially,the average net primary productivity was higher in the middle and decreasing towards the edges.The elevation varied from-12 to 2,081 m,exhibiting a trend of being high in the west and low in the east,with significant fluctuations in the west and relatively gentle terrain in the east.The slope ranged from 3.3°to 76.7°,showing a trend of being higher in the west and lower in the east.The soil erodibility values ranged from 0.011 to 1.411,indicating that soil erodibility tends to be low in the middle and high towards the edges,spreading and improving from the central area to surrounding regions.② From 2000 to 2020,the amount of soil and water conservation in Hunan Province ranged from 8.75 to 185.97 t/hm2,demonstrating an upward trend over time,primarily in general important and important regions.The area of general important region showed a downward trend over time,while the area of important region showed an upward trend,and the area of extremely important regions exhibited a downward trend.The service function of soil and water conservation transitioned from generally important and extremely important regions to important regions over time.[Conclusion]The increase in net primary productivity of vegetation is the primary reason for the enhancement of soil and water conservation service functions.关键词
GIS/植被净初级生产力/水土保持服务功能/湖南省Key words
geographic information system(GIS)/net primary productivity of vegetation/soil and water conservation service function/Hunan Province分类
农业科技
