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Position: Home > Articles > Analysis of Vegetation Coverage Change in Typical Oasis Area in Recent 20 Years Based on Dimidiate Pixel Model Water Saving Irrigation 2019 (1) 96-101

基于像元二分模型的典型绿洲区近20年植被覆盖变化及分析

作  者：
王金强;李俊峰;王昭阳;杨广;何新林
单  位：
石河子大学水利建筑工程学院
关键词：
石河子地区;植被覆盖度;像元二分模型;转移矩阵
摘  要：
随着城市化和规模化节水灌溉的推广,西北干旱内陆绿洲区的地表植被覆盖发生了很大的变化。研究利用遥感技术,选取新疆石河子地区1998年,2007年和2017年的TM/OLI影像数据,基于像元二分模型,分析了三个不同时段的植被覆盖度和植被变化情况。结果表明:1998年,2007年和2017年植被覆盖度分别为52%,60%和48%,呈先增加后降低的趋势;Ⅱ级和Ⅲ级植被覆盖区分别以平均每年1.17%和1.56%的速率递增;Ⅰ级、Ⅳ级和Ⅴ级植被覆盖区分别以平均每年0.05%,0.26%和0.75%的速率递减,总体而言,该地区近20年植被退化面积大于恢复面积。结合土地、气象、水文等资料分析,认为地下水的过度开采和城市化的扩大等人为原因是该地区植被发生退化的主要原因。
译  名：
Analysis of Vegetation Coverage Change in Typical Oasis Area in Recent 20 Years Based on Dimidiate Pixel Model
作  者：
WANG Jin-qiang;LI Jun-feng;WANG Zhao-yang;YANG Guang;HE Xin-lin;College of Water Conservancy & Architectural Engineering,Shihezi University;Key Laboratory of Modern Water-Saving Irrigation of the Xinjiang Production and Construction Corps;
单  位：
WANG Jin-qiang%LI Jun-feng%WANG Zhao-yang%YANG Guang%HE Xin-lin%College of Water Conservancy & Architectural Engineering,Shihezi University%Key Laboratory of Modern Water-Saving Irrigation of the Xinjiang Production and Construction Corps
关键词：
Shihezi;;vegetation coverage;;Dimidiate Pixel model;;transfer matrix
摘  要：
Since the promotion of urbanization and large-scale water-saving irrigation,great changes have taken place in the Northwest Inland Oasis of China.Using Remote Sensing earth observation technology,the year of 1998,2007 and 2017 image data(TM/OLI) in the Shihezi region of Xinjiang were selected and combined with Dimidiate Pixel model to estimate the vegetation coverage and vegetation changes,and the transition matrix of vegetation cover area change in each year was calculated.The results showed that vegetation coverage in the study area in 1998,2007 and 2017 were 52%,60%,and 48%,respectively,which indicated a trend of firstly increasing and then decreasing;the vegetation coverage areas of grade II and III were increased 1.17% and 1.56% per year,respectively;the vegetation cover areas of grades I,IV and V decreased at an average rate of 0.05%,0.26% and 0.75% per year,respectively;the area of vegetation degradation in this region was larger than that in the restoration area in the past 20 years.Based on the analysis of land,meteorological and hydrological data,it is concluded that the large-scale use of water-saving irrigation,over-exploitation of groundwater and the expansion of urbanization are the main reasons for vegetation degradation in the area.

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