Remote sensing monitoring of water erosion desertification and spatio-temporal differentiation of its influencing factors in the Yunnan-Guizhou Plateau in recent 30 years

doi:10.13474/j.cnki.11-2246.2021.317

Abstract

Abstract: The Yunnan-Guizhou Plateau (YGP) is a typical seasonal arid ecological fragile area, and water erosion desertification (WED) that is caused by water flow has become one of the important ecological and environmental problems in the region. In this paper, long-term Landsat datasets are used to monitor the temporal and spatial variation trend of WED for the past 30 years in the YGP, and the spatial and temporal differentiation of its influencing factors is analyzed. A multi-index rule classification algorithm is proposed for remote sensing monitoring of WED in the YGP, and three key influencing factors (such as vegetation area, GDP and precipitation) are selected to analyze the spatio-temporal differentiation of the WED influencing factors using geographic weighted regression (GWR) model in the YGP. The experimental results are shown as following:① the main area of WED in YGP can be divided into Dian-Gui-Qian area, Sichuan-Yunnan border area, Dianxi area and Mengzi region. ② the WED expansion in the YGP can be divided into three stages as follows:a slow increase from 1989 to 2010, rapid expansion from 2010 to 2013, and a slight increase from 2013 to 2016. ③ The relationship between the three key infulencing factors and water-erosion desertification presents different spatial size in different numbers, positive and negative effects and the spatial distribution difference of factor combination effects. The local economic development and climate change exacerbate water-erosion desertification in local areas. The research results will provide theoretical basis and support for the fine prevention, control and treatment of water erosion and desertification in the YGP.

Key words: the Yunnan-Guizhou Plateau, water-erosion desertification, remote sensing monitoring, multi-index rule classification, spatial-temporal differentiation, geographic weighted regression (GWR)

CLC Number:

P237

GAO Zhaozhong, HUANG Yajun, WEI Haixia, ZHANG Jinlan. Remote sensing monitoring of water erosion desertification and spatio-temporal differentiation of its influencing factors in the Yunnan-Guizhou Plateau in recent 30 years[J]. Bulletin of Surveying and Mapping, 2021, 0(10): 117-122.

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