| 藏北申扎县植被退化的遥感分析 |
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| 引用本文： | 徐瑶,何政伟,陈涛. 藏北申扎县植被退化的遥感分析[J]. 贵州农业科学, 2012, 40(4): 76-78 |
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| 作者姓名： | 徐瑶 何政伟 陈涛 |
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| 作者单位： | 1. 成都理工大学地球科学学院,四川成都610059;西华师范大学国土资源学院,四川南充637002
2. 成都理工大学地球科学学院,四川成都,610059 |
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| 基金项目： | 西藏自治区科技厅重点项目 |
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| 摘 要： | 为了监测和分析申扎县草地退化的空间特征及其退化趋势,利用两个时相的遥感数据,分别提取申扎县的植被指数,根据植被指数转化模型,计算植被覆盖度,按植被覆盖度将植被划分为4个不同退化等级,并分析了申扎县植被退化的时空变化特征。结果表明:1989-2009年申扎县植被覆盖发生了很大的变化,总体变化趋势是植被退化面积不断增加,中度、重度退化面积在总退化面积中所占比例呈增加趋势。1989年植被退化以中东部地区最严重,2009年申扎县的北部植被退化最严重。
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| 关 键 词： | 植被退化 遥感 藏北 |
Remote Sensing Analysis on Vegetation Degradation in Shenzha County of Northern Tibet |
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| XU Yao , HE Zheng-wei , CHEN Tao. Remote Sensing Analysis on Vegetation Degradation in Shenzha County of Northern Tibet[J]. Guizhou Agricultural Sciences, 2012, 40(4): 76-78 |
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| Authors: | XU Yao HE Zheng-wei CHEN Tao |
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| Affiliation: | 1,2(1.College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059;2.Land and Resources College,China West Normal University,Nanchong,Sichuan 637002,China) |
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| Abstract: | In order to monitor and analyze the spatial characteristics and degradation tendency of grassland in Shenzha County,the vegetation index of Shenzha County was extracted with remote sensing images of two periods and according to vegetation index transformation model,the vegetation coverage fraction was calculated with vegetation index.The vegetation degradation was divided into four different degree according to vegetation coverage fraction.The spatio-temporal characteristics of change of vegetation degradation was analyzed.The results show that vegetation coverage has changed very greatly during 1989-2009 in Shenzha County,the tends of vegetation degradation is more and more serious,and the medium-degraded and seriously degraded vegetation are increasing.The degree of vegetation degradation in the mideast area is the most serious in 1989 and it is the most serious in north area in 2009. |
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| Keywords: | vegetation degradation remote sensing Northern Tibet |
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