青藏高原地区不同植被类型MODIS植被指数与海拔高度的关系研究  

The relationships between MODIS vegetation indices and altitude in the Tibetan plateau

作　　者：万红[1] 李希灿[1] 万剑华[2] 郭鹏[2] 

机构地区：[1]山东农业大学信息科学与工程学院,泰安271018 [2]中国石油大学(华东)地球科学与技术学院,青岛266555

出　　处：《干旱区资源与环境》2013年第11期39-44,共6页Journal of Arid Land Resources and Environment

基　　金：国家科技计划项目(2011BAD21B0601)资助

摘　　要：高原地区的植被除了对温度、降水等气候因素响应敏感外,还受到海拔高度的影响。文中利用2006年和2008年8月份青藏高原地区的MODIS-NDVI和MODIS-EVI,结合DEM数据,分析了研究区内林地、灌丛、草甸、草原、高山植被、荒漠6种植被类型与海拔高度的相关关系。结果表明:林地和高山植被的ND-VI和EVI值随海拔高度上升而下降,其相关系数的绝对值的最小值分别为0.96和0.86,呈现显著的负相关关系;草原、灌丛的NDVI和EVI与海拔的负相关性较强,其相关系数的绝对值的最小值分别0.70和0.56。荒漠的NDVI和EVI与海拔高度基本不相关,无植被覆盖区则与海拔有较强的相关性;草甸的植被指数随海拔高度的增高呈现出先增高后减小的分段变化趋势。研究结果对青藏高原地区的植被分布及其变化监测具有借鉴意义。In plateau area,vegetation is impacted by altitude in addition to climate factors,such as temperature and precipitation.In this study,MODIS-NDVI and MODIS-EVI of 2006 and 2008 of the Tibetan plateau were combined with the DEM data to analyze the correlation between vegetation indices of forest,shrub,meadow,grassland,alpine vegetation,desert,bare land and altitude.The results indicated that different land cover showed specific trend with altitude increased.The MODIS-NDVI and MODIS-EVI of forest and alpine vegetation had a significant negative correlation with the altitude,and the absolute values of correlation coefficients were greater than 0.96 and 0.86,respectively.The correlation between shrub,grass land and altitude were strongly negative with minimum absolute value with correlation coefficients about 0.7 and 0.56,respectively.Bare land region,NDVI and EVI showed a strong positive correlation with altitude,and the correlation coefficient was over 0.70.The MODIS-NDVI and MODIS-EVI of the desert were almost independent on altitude;the meadow showed a piecewise significant correlation with altitude.The results are of significance for researching the distribution and change of vegetation in the Tibetan plateau.

关 键 词：植被指数 MODIS-NDVI MODIS-EVI 海拔高度 青藏高原 

分 类 号：Q948[生物学—植物学]