A study on the evolution mechanism of agricultural landscape pattern of Dadu River Valley in Danba Region

Taking the Dadu River Basin in Danba area of Ganzi Prefecture, Sichuan Province as research area, based on 2013 and 2016 Landsat8 remote sensing images, temperature vegetation drought index (TVDI) method is used to divide dry valley into 6 arid gradient regions. Using ArcGIS10.5 software Fragstats4.2 calculate landscape pattern different areas years, combined with survey results agricultural policies, development models, patterns key regions, analyze evolution under gradients. The show that, except for other forestlands, degree fragmentation decreasing year by light moderate drought, spatial heterogeneity higher. On extreme higher, lower.