Study on soil erosion Simulation in Tianshui Maiji district based on InVEST-SDR model with GIS and RS

Abstract

The Maiji district of Tianshui city locates in the transition regions of semi-arid and semi-humid with fragile ecosystems, so it is of great scientific and practical significance to analyse and study its characteristics and influencing factors of soil erosion. Based on GIS, RS and InVEST-SDR model, this paper simulates the soil erosion in 2015 and analyses the effect of different influencing factors on soil erosion. The results showed that: 1) In 2015, the soil erosion in the study area was mainly slight and light erosion, in spatially, the north-western part of the study area was more eroded than other regions; 2) The effect of vegetation cover on soil erosion presented bimodal pattern mode; 3) The effects of elevation and slope on soil erosion had a critical value of 1300 m and 30 degree; 4) Forestland was the main type of land use that produced the largest amount of soil erosion in the region, followed by cropland and grassland.