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[1]LI Lei,LAN Anjun,ZHONG Jiusheng.Changes in Vegetation Cover and Their Response to Topography and Geomorphology in Qianzhong Water Conservancy Hub Engineering Areas[J].Research of Soil and Water Conservation,2022,29(04):176-183.

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Changes in Vegetation Cover and Their Response to Topography and Geomorphology in Qianzhong Water Conservancy Hub Engineering Areas

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 04 Page number: 176-183 Column: Public date: 2022-06-20

Title:: Changes in Vegetation Cover and Their Response to Topography and Geomorphology in Qianzhong Water Conservancy Hub Engineering Areas

Author(s):: LI Lei, LAN Anjun, ZHONG Jiusheng; (School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China)

Keywords:: topography; landform; vegetation coverage change type; distribution index; differential characteristic; Qianzhong Water Conservancy Project

CLC:: TP79; Q948

DOI:: -

Abstract:: In order to explore the changes of vegetation cover in major water conservancy project areas in karst mountainous areas and their response to topography and landforms, and to facilitate the scientific implementation as well as sustainable development of regional rocky desertification control and large-scale water transfer projects, taking Qianzhong Water Conservancy Project in Guizhou Province as example, based on MODIS-NDVI Database and Pixel Dichotomy, we calculated overall vegetation coverage degree in the research area from 2001 to 2020. And based on the graded data, with combination of the extract models coverage distribution indexes and vegetation-coverage-change types, the changes in vegetation cover in research area and their response to topography and geomorphology were analyzed. The results turn out the following 4 conclusions. Firstly, the entire research area was dominated by high and relatively high coverage degrees. In the past 20 years, along with constantly increasing vegetation coverage area by average annual growth rate of 0.46%, overall vegetation restoration achieved better result. Secondly, the changes of vegetation cover were mainly improved and stable. Among the totally 28 districts(counties), the vegetation degradation areas separately in Baiyun District, Guanshanhu District and Xiuwen County were greater than corresponding vegetation improvement areas with greater ecological-degradation risks, so ecological protection should be strengthened. Thirdly, from the perspective of geomorphology, the improvement level of vegetation coverage in non-karst areas were relatively significant than the counterparts in pure-karst areas and sub-karst ones. Fourthly, from the view of topography, along with the increasing altitude and slope, total distribution advantage of vegetation coverage-degradation type decreased, dominated by stable type. From the angle of slope change, overall degradation of flat-land vegetation coverage appeared apparent. And degradation of vegetation coverage in the rest areas was not obvious. Therefore, the vegetation-coverage dominant range and change types in Qianzhong Water Conservancy Project have significant spatial differential characteristics.

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Last Update: 2022-06-20