2000～2011年毛乌素沙地植被生长状况时空变化特征  

Spatial and Temporal Variations of Vegetation Growth Status in Mu Us Sandy Land in 2000-2011

作　　者：闫峰[1] 吴波[1] 王艳姣[2] 

机构地区：[1]中国林业科学研究院荒漠化研究所,北京100091 [2]中国气象局国家气候中心,北京100081

出　　处：《地理科学》2013年第5期602-608,共7页Scientia Geographica Sinica

基　　金：林业公益性行业科研专项(201004010);中央级公益性科研院所基本科研业务费专项(CAFYBB2011003)资助

摘　　要：采用2000～2011年MOD13Q1数据构建EVI时间序列谱，对毛乌素沙地植被生长状况的时空特征进行了研究。主要得出以下结论：①2000～2011年毛乌素沙地EVl年最大值以轻微波动为主，植被生长状况在2001年最差，2010年最好。②全区EVl年最大值按O．0025／a的速度递增，植被生长状况趋于改善的面积占总面积的81．916％，主要分布在中部、东部和南部等地区；生长状况呈变差趋势的面积占总面积的18．084％，主要分布在北部、西部和中南部。③植被生长状况以轻度和中度波动改善为主，主要分布在西南、中部和东部；重度波动改善区主要分布在西南部和东南部，轻度和中度波动退化区主要分布在西南部、西部和中南部。Mu Us Sandy Land lies in the farming-pastoral ecotone of northern China, whose ecological environment shows great sensitivity and vulnerability. In this article, temporal series of MOD13Q1 productions, which derived from moderate resolution imaging spectroradiometer （MODIS） sensor in 2000-2011, were used to establish temporal sequence of annual enhanced vegetation index （EVI） maximum. Departure, slope, standard deviation and coefficient of variance of EVI were calculated to study the spatial and temporal characteristics of vegetation growth status in Mu Us Sandy Land. Results show that： 1） in 2000-2011, annual maximum of EVI value mainly fluctuates slightly in Mu Us Sandy Land and area whose EVI departure range is -0.1 ≤ AEBw≤ 0.1, occupies more than 98.467% of the total area. Area with -0.2≤ AEEw〈-0.1 is the largest in 2001 （1.341%） and the smallest is in 2009 （0.074%）. Area with 0.1 〈AEEvI~〈0.2 is the largest in 2002 （1.050%） and is the smallest.in 2001 （0.138%）. In the whole region, the average EVI departure values in 2000, 2001, 2003, 2005 and 2006 are negative while the values in 2002, 2004, 2007, 2008, 2009, 2010 and 2011 are positive. Vegetation growth status is the worst in 2001 and the second worst is in 2000. Conversely, the best vegetation growth status is in 2010 and the second best in 2002.2） Annual maximum of EVI in the whole region increases by 0.002 5/a. Area with increasing trend occupies 81.916% of the whole area, which mainly distributes in the middle, eastern and southern parts of Sandy Land. Area with decreasing trend occupies 18.084% of the whole area, which mainly distributes in the northern, westem, southern and middle parts of Mu Us Sandy Land. 3） Vegetation grow status mainly improves with slight and moderate fluctuations, whose areas occupie 35.878% and 34.697% of the total area respectively, which locate in the southwest, middle and eastern parts of Mu Us Sandy Land. Area of vegetation with severe fluctuated improving growth status occupies 8

关 键 词：植被指数 生长状况 时空特征 毛乌素沙地 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]