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当前位置: 首页 > 文章 > 基于SPOT NDVI的阿尔金山自然保护区植被动态变化研究 干旱区研究 2014,31 (5) 51-56
Position: Home > Articles > Dynamic of Vegetation in the Altun Mountain Nature Reserve Based on SPOT NDVI Arid Zone Research 2014,31 (5) 51-56

基于SPOT NDVI的阿尔金山自然保护区植被动态变化研究

作  者：
刘世梁;赵海迪;董世魁;苏旭坤;刘琦;邓丽;张翔
单  位：
阿尔金山国家级自然保护区管理局;北京师范大学环境学院水环境模拟国家重点实验室
关键词：
NDVI;时空分布;气候变化;植被变化;自然保护区;阿尔金山
摘  要：
气候变化对陆地生态系统,特别是高寒地区植被的影响是全球变化研究的重要方面。利用1998—2008年SPOT-VGT NDVI植被指数,分析了阿尔金山NDVI时空变化特征及其与主要气候因子(气温、降水)的相关关系。结果表明:保护区平均NDVI年内季节变化明显,DN变化幅度在33~53,5月开始较快上升,最高值出现在9月,其多年平均值为40,总体上呈先下降后上升的趋势。从空间分布上看,NDVI的高值主要集中在阿雅克湖流域,特别是卡尔敦检查站附近。趋势分析表明,除河流、湖泊附近的植被有所退化外,保护区内部植被总体上有所改善,气温和降水与NDVI线性相关显著;而保护区边缘植被有不同程度的退化,人类活动或许是植被退化的诱导因素。
译  名：
Dynamic of Vegetation in the Altun Mountain Nature Reserve Based on SPOT NDVI
作  者：
LIU Shi-liang;ZHAO Hai-di;DONG Shi-kui;SU Xu-kun;LIU Qi;DENG Li;ZHANG Xiang;State Key Laboratory of Water Environment Simulation,College of Environment,Beijing Normal University;Administration of Altun Mountain National Nature Reserve;
关键词：
NDVI;;spatiotemporal distribution;;climate change;;vegetation change;;nature reserve;;Altun Mountain
摘  要：
Historical climate change affects significantly the current biogeography and the ongoing change will remain one of the major drivers of biodiversity patterns in the future. The impact of climate change on terrestrial ecosystems,especially on alpine vegetation,is of great importance in global change research. Situated in a closed basin surrounded by high mountains at an altitude of 4 500 m a. s. l.,the Altun Mountain Nature Reserve is currently the largest comprehensive nature reserve in China. The vegetation change will affect the habitats of wild animals including the poephagus mutus,Equus kiang and Pantholops hodgsonii in the nature reserve. Based on the values of SPOT-VGT NDVI vegetation index during the period of 1998- 2008,the spatiotemporal variation of NDVI in the Altun Mountain Nature Reserve and its relationship with climatic factors including temperature and precipitation were studied. Using ArcGIS spatial analyst,the distribution of vegetation degeneration or improvement was lucubrated based on the linear regression analysis. The results showed that there was a distinct seasonal change of NDVI at the watershed scale,the DN value varied in a range from 33 to 53,it was rapidly increased in May,and its highest value occurred in September. The multi-year average value was about 40,it was decreased in 2001 and then increased. Spatially,the high values of NDVI occurred mainly in the Ayak Lake Basin,especially near the Kardun Checkpoint. Trend analysis using linear regression showed that the vegetation was holistically improved in the nature reserve except that near the rivers and lakes was degenerated to some extent. There was a significant linear correlation between the NDVI and the temperature and precipitation. A vegetation degeneration occurred in the marginal zone of the nature reserve possibly due to human activities.

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