摘要
利用1982-2006年的GIMMS/NDVI资料,分析柴达木盆地植被的空间分异规律,并结合盆地的地形、降水、水系、土地利用和植被分布图等资料,通过叠加分析,进一步研究了植被空间分异的影响因素。结果表明:柴达木盆地的植被覆盖总体偏低,由东南向西北呈明显的三层半环状结构;在局部地区由于河流、湖泊和地下水等水文条件的影响,上述半环状结构成非连续状态而形成突出亮斑和线状特征;柴达木盆地植被覆盖的影响因素主要包括降水、地表地下水文条件、海拔高度和人类活动4个方面;降水和海拔有一定的关联性,从总体上决定了盆地植被分布的基本格局;水体和人类活动对植被分布的作用主要体现在局部地区,并且往往打破降水和海拔作用下的植被分布格局。
Vegetation is a natural bridge that links soil,air,water and other elements of the nature,and also an important direct factor of ecological environment.Because satellite remote sensing has advantages of simultaneous and time-intensive observations,data comparability,etc.,it provides a powerful tool for dynamic detection of vegetation in large areas.In a variety of surface parameters,NDVI（normalized difference vegetation index） is especially sensitive to vegetation growth and can represent the change of vegetation coverage to some extent,so NDVI is regarded as the best instructing factor of surface vegetation.There have been a lot of studies using NDVI,but most of the previous studies focused on the relationships between climatic factors and vegetation indices or explored the dynamic change of vegetation in some specific regions by analyzing the dynamic change of NDVI.It is believed that the multi-year average of vegetation index reflects a normal state of vegetation coverage,so another important application of NDVI is to use the average value to study the spatial distribution of regional vegetation and its affecting factors.The Qaidam Basin is characterized by the diverse terrains,significant vertical differentiation and quite inhomogeneous spatial distribution of vegetation.Because of its special geographical location and climatic characteristics,its ecological environment is relatively vulnerable.Therefore,the study on the spatial distribution of vegetation coverage and its affecting factors in the Qaidam Basin using data series of NDVI is of great significance both for the expansion of NDVI application and the ecological conservation in the Qaidam Basin.In this paper,the spatial distribution of vegetation coverage in the Qaidam Basin is analyzed using GIMMS（global inventory modeling and mapping studies） /NDVI data set from January 1982 to December 2006.The factors affecting the spatial distribution of vegetation coverage in the Qaidam Basin are also analyzed based on the data of precipitation,terrain,s
出处
《干旱区研究》
CSCD
北大核心
2010年第5期691-698,共8页
Arid Zone Research
基金
国家自然科学基金(90302009
40801216)
水利部公益性项目"柴达木盆地主要生态系统生态耗水规律研究"共同资助
关键词
NDVI
植被覆盖
空间格局
水文条件
柴达木盆地
NDVI
vegetation coverage
spatial differentiation
hydrological conditions
Qaidam Basin.
