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当前位置: 首页 > 文章 > 基于NDVI的藏北地区草地退化时空分布特征分析 草业学报 2016,25 (3) 1-8
Position: Home > Articles > Temporal and spatial distribution of grassland degradation in northern Tibet based on NDVI Acta Prataculturae Sinica 2016,25 (3) 1-8

基于NDVI的藏北地区草地退化时空分布特征分析

作  者：
曹旭娟;干珠扎布;梁艳;高清竹;张勇;李玉娥;万运帆;旦久罗布
单  位：
中国农业科学院农业环境与可持续发展研究所;北京师范大学环境学院;西藏自治区那曲地区草原站
关键词：
草地退化;NDVI;植被盖度;藏北地区
摘  要：
本文以藏北地区为研究区域,基于归一化植被指数(NDVI)反演草地植被盖度,以植被盖度作为判断草地退化的标准,综合计算藏北地区2000-2010年逐年草地退化指数(grassland degradation index),定量揭示藏北地区草地退化的时空分布规律。结果表明,截至2010年,藏北地区草地退化现状仍然较为严重,退化草地的面积占全区面积的58.2%。其中,重度退化和极重度退化草地面积的比例分别为19.0%和6.5%,区域草地退化指数为1.97,接近中等退化水平。分区结果显示,藏北地区中部、东部、北部草地退化情况较为严重,均处于中等退化等级,西部地区的退化情况最轻,处于轻度退化等级。分析2000-2010年藏北地区全区及各个分区的草地退化趋势表明,只有北部地区有减缓趋势;2000-2010年间与1981-1985年间对比结果显示,重度退化及极重度退化草地面积比例上升幅度较大。2000-2010年间藏北地区平均草地退化指数为1.84,草地退化等级在轻度退化到中度退化之间波动。
译  名：
Temporal and spatial distribution of grassland degradation in northern Tibet based on NDVI
作  者：
CAO Xu-Juan;Ganjurjav H;LIANG Yan;GAO Qing-Zhu;ZHANG Yong;LI Yu-E;WAN Yun-Fan;DANJIU-Luobu;Institude of Environment and Sustainable Development in Agriculture,Chinese Academy of Agriculture Science;Key Laboratory for Agro-Environment & Climate Change,Ministry of Agriculture;School of Environment,Beijing Normal University;Naqu Grassland Station,Tibet Autonomous Region;
关键词：
grassland degradation;;NDVI;;vegetation cover;;northern Tibet
摘  要：
An expansive alpine grassland ecosystem dominates the landscape in Northern Tibet,and the status of this grassland has significant implications for the major Asian rivers,and for the climate and eco-environment of Tibet and the wider region.The harsh natural environment and fragile ecosystem,together with increasing frequency and intensity of human activities such as pastoralism,and climate change,have resulted in increasing reports of degradation of the grassland ecosystem.We used vegetation cover as main indicator of ecosystem health,and with remote sensing monitoring,calculated the grassland degradation index(GDI)and evaluated grassland degradation in Northern Tibet from 2000 to 2010.The analysis was based on the Normalized Differential Vegetation Index(NDVI)data from the Advanced Very High-Resolution Radiometer(AVHRR)with a spatial resolution of 8km from 1981 to 1985and from Moderate Resolution Imaging Spectroradiometer(MODIS)with a spatial resolution of 0.25 km of 2000-2010.Then,we have analyzed the temporal and spatial distribution of grassland degradation in Northern Tibet from 2000 to 2010.It was found that grassland degradation in Northern Tibet was still severe.The GDI was 1.97 in 2010,near to seriously degraded status.The extremely seriously degraded and seriously degraded categories occupied 6.5% and 19.0% of the study area,respectively.The moderately and slightly degraded grassland categories accounted for 15.1% and 12.1%,respectively.Undegraded grassland occupied 41.8% of the total grassland area in 2010.The extent of extremely seriously degraded and seriously degraded categories was greatly increased in the data from 2000-2010,compared with the period from 1981-1985.However,the increase in grassland degradation in Northern Tibet from 2000 to 2010was slight,with the mean value of the GDI being 1.84 in 2010,representing a change from light degradation to moderate degradation in Northern Tibet from 2000 to 2010.

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