Abstract
Taking the Dadu River Basin in the Danba area of Ganzi Prefecture, Sichuan Province as the research area, based on the 2013 and 2016 Landsat8 remote sensing images, the temperature vegetation drought index (TVDI) method is used to divide the Dadu River dry valley into 6 arid gradient regions. Using ArcGIS10.5 software and Fragstats4.2 software to calculate the landscape pattern index of different arid gradient areas in different years, combined with the survey results of agricultural policies, development models, and agricultural landscape patterns in key regions, analyze the evolution of agricultural landscape patterns under different drought gradients. The results show that, except for other forestlands, the degree of landscape fragmentation is decreasing year by year on the gradient of light and moderate drought, and the degree of spatial heterogeneity is higher. On the gradient of extreme drought, the degree of landscape fragmentation is higher, and the degree of spatial heterogeneity is lower.
Highlights
Dry valleys are a special type of mountainous regions in southwest China
Study data came from two periods of Landsat 8 remote sensing data images in 2013 and 2016 (Spatial resolution 30M), which were pretreated by atmospheric correction and radiation calibration with ENVI software to calculate the temperature vegetation drought index (TVDI) [2] which was divided into three gradients and six grades (1-6)
The results show that under different drought gradients, the distribution index dominance of most land use types decreases with the increase of drought degree
Summary
Dry valleys are a special type of mountainous regions in southwest China. They belong to the fragile ecological environment and are one of the hotspots of ecological research [1]. Studying the mechanism of an agricultural landscape pattern change in arid valleys, analyzing and discussing the influencing factors of changes in the range of local arid valleys, can provide the theoretical and scientific basis for preventing the destruction of river basin biodiversity and the degradation of ecological functions, and maintaining regional ecological security. There have been many domestic and foreign researches on dry valleys and agricultural environmental changes, but they mainly focus on case studies for some large-scale and wide-range ecological fragile areas, high-intensity land-use areas and special areas. Two research years of 2013 and 2016 are selected to try to reveal the factors affecting the changes in the agricultural landscape pattern and to promote the maintenance of the ecological security and sustainable development of agriculture in Pakistan provide a reference
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