澜沧江流域植被覆盖变化特征及其与气候因子的关系  

Characteristics of Vegetation Cover Changes in Lantsang Basin Based on MODIS Vegetation Index Products (MOD13)

作　　者：李亚飞[1,2] 刘高焕[2] 

机构地区：[1]中国民航大学,天津300300 [2]中国科学院地理科学与资源研究所资源环境与信息系统国家重点实验室,北京100101

出　　处：《资源科学》2012年第7期1214-1221,共8页Resources Science

基　　金：国家科技基础性工作专项项目计划:“澜沧江及大香格里拉地区科学考察”(编号:2008FY110300)

摘　　要：通过比较MODIS植被指数产品NDVI和EVI的差异,选择利用2000年-2009年的NDVI产品来分析澜沧江流域植被覆盖变化特征。分析了澜沧江流域NDVI的时间和空间变化规律,同时,研究了该流域NDVI与主要气候因子(气温、降水、相对湿度、日照时间)之间的相关关系。结果显示:从2000年到2009年的10年间,澜沧江流域的植被覆盖状况整体较好,年均NDVI都大于0.45,年际变化呈波动增加趋势,生态环境有改善的趋势。但流域平均NDVI季节性变化明显,呈典型的单峰分布,NDVI最低值在3月,5月份开始迅速上升,最高值在8月。NDVI在0.35至0.6之间波动。澜沧江流域月均NDVI与气温、降水量、相对湿度和日照时数关系密切,相关系数分别为0.619,0.691,0.801和-0.601,气温的升高有利于流域生态环境的改善。在空间上,流域平均NDVI表现出明显的纬度地带性特征,最高值出现在流域最南部,最低值出现在最北部。10年来NDVI值变小的区域集中在上游和下游,NDVI值变大的区域主要集中在中游。Vegetation is the important indication of regional eco-environmental characteristics. Its distribution, community structure and productivity can reflect the climate change and indicate the range of climate change. Changes of vegetation cover are mainly caused by climate change and human activities. In this paper, by comparing data characteristics of MODIS NDVI with MODIS EVI, MODIS NDVI vegetation index from 2000 to 2009 was selected to analyze characteristics of vegetation change in the Lantsang Basin. The temporal and spatial variation characteristics of NDVI and its correlation with four major climate factors （temperature, precipitation, relative humidity and sunshine duration） were analyzed. The results show that the annual average NDVI of the basin is greater than 0.45, showing a fluctuately increasing trend during 2000 and 2009; the ecological environment of the basin shows a trend of improving. Within the year, seasonal change of the average NDVI of the basin is obvious, presenting a typical unimodal distribution. The NDVI reaches the minimum value in March, begins to rise rapidly in May and reaches the maximum value in August, ranging from 0.35 to 0.60. Therefore, we know that the situation of vegetation cover also shows a trend of unimodal change in the Lantsang Basin. From June to August, the situation of vegetation cover is the best, while from February to April it is the worst. Besides, it has typical seasonal distribution characteristics, which is consistent with vegetation growth rule. The linear correlation coefficients between NDVI and the four major climate factors are 0.619,0.691, 0.801 and -0.601 respectively. In the space, the average NDVI in the basin shows a latitudinal zonal characteristic, with the maximum value appearing in the southmost basin and the minimum value appearing in the northmost basin. During the past 10 years, the average NDVI decreased in the headstream and downstream, which mainly include Apline meadow and Typical and subtropical broad-leaved forest and increased in th

关 键 词：澜沧江流域 MODISNDVI 气候 植被 时空变化 

分 类 号：P461.7[天文地球—大气科学及气象学]