2001年至2010年澜沧江流域植被覆盖动态变化分析  

Spatial-Temporal Dynamic Changes of Vegetation Cover in Lancang River Basin during 2001-2010

作　　者：范娜[1,2] 谢高地[1] 张昌顺[1] 陈龙[1,2] 李文华[1] 成升魁[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《资源科学》2012年第7期1222-1231,共10页Resources Science

基　　金：科技部基础性工作专项(编号:2008FY110300);国家973课题(编号:2009CB421106);国家自然科学基金项目(编号30770410)

摘　　要：本文利用2001年-2010年MODIS09Q1数据,基于遥感和地理信息系统技术,建立近10a澜沧江流域NDVI时序数据集。并利用最大值合成法、一元线性回归方法、Hurst指数方法分析近10a澜沧江流域植被的时空变化。结果表明:①多年平均的植被指数有明显的空间差异性,随着纬度的升高而降低,在北纬27.6～29.2°存在一个明显的过渡带;且与高程和坡度均呈负相关关系,植被指数随着高程升高而降低的趋势较明显,高程大于5000m的区域NDVI平均值仅为0.18;②近10a来,澜沧江流域植被总体呈现增加趋势,但增加速率和增加幅度存在区域差异,上游地区植被覆盖增加最快且幅度最大,中游次之,下游最低;③2001年-2010年澜沧江流域植被覆盖整体得到改善的区域面积明显大于退化区域;澜沧江流域Hurst指数分析表明澜沧江流域植被变化将保持现在的趋势;综合分析slope和Hurst指数结果,表明NDVI变化趋势以良性发展为主,但NDVI强持续性的退化区和弱持续性的改善区域值得关注。Remote sensing data has been widely used to monitor the change of eco-environment and vegetation cover. Normalized Differential Vegetation Index （NDVI） is an effective way to analysis spatial-temporal dynamic change of vegetation cover .Based on RS and GIS technology, MODIS09Q1 data with spatial resolution of 250m×250m from 2001 to 2010 were used to construct NDVI time series dataset in the Lancang River basin. To furtherly remove the cloud contaminated images,the HANTS algorithm and MVC（Maximum Value Composites）method were used. Then, this paper analyzed the temporal and spatial variation of vegetation index by using the liner regression, HURST index and other methods. The results showed that： 1） The annual NDVI had an obvious spatial difference： it was found that vegetation index decreased when latitude increased from south to north ,and at the same time there was an abrupt decline at 27.6°～29.2°N where the NDVI decline rate was higher than other regions; it was also foud that NDVI showed negative correlation with DEM and slope, the trend that NDVI reduced with the rising of the elevation was more apparent, the average NDVI of the area （DEM〉 5000 m） was only 0.18; 2） The value of NDVI had a fluctuation change trend during the past 10 years ,but on the whole there still was a significant increased trend of vegetation cover in the Lancang river basin（R 2 =0.52,P=0.02）, reaching a maximum value 0.7 of the whole area in 2010. NDVI increased with 0.02/year average rate and the NDVI of 2010 was 28.57% more than NDVI of 2001.The trends of the upper basin, middle basin and lower basin were similar with the entire basin, but the rate the degree of change were not the same. In general, the rate of change in the upper basin was higher than other basins, and the degree of changes in the upper basin were most obvious; 3） During the period of 2001-2010, the vegetation cover improved area was much larger than the degraded area, which occupied 80% or more of the total basin; Based on the Hurst

关 键 词：澜沧江流域 归一化植被指数(NDVI) 时空格局 趋势分析 HURST指数 

分 类 号：Q948[生物学—植物学]