【摘要】 利用2000-2013年MODIS数据、采用像元二分模型计算了延安市植被覆盖度并分析其时空变化。时间上,植被覆盖度呈北部比南部快和相似于降水量变化的增长趋势,主要得益于国家政策等人为因素;空间上,西南部和东南部高且稳定,西部、北部和东北部低且标准差大。植被覆盖度与延安自然地理特征分布一致,跟地形走势西北高东南低相反,同水资源分布显著相关,反映海拔高度、地形起伏和水资源对其影响。更多还原

【Abstract】 Because ecological environment is fragile in Yan’an region,the main objectives were to improve the vegetation coverage. This research calculated and analyzed the vegetation coverage from 2000 to 2013 in Yan’an region by the data of MODIS and two sub- pixel model. The results were as follows: Form the time scale,the vegetation coverage had a slight fluctuation growth. The peak and valley were similar to the interannual change of precipitation. The growth trend was mainly due to the factors such as national policy. For spatial scale,the areas of relatively high vegetation coverage was distributed in southwest and southeast,however,the vegetation coverage was small in west,north and northeast. The vegetation coverage was consistent with the natural geographical characteristics and contrary to the terrain trend in Yan’an region,moreover,it was also significantly correlated to the distribution of water resources. It reflected the effects of altitude,topography and water resources on the vegetation coverage.更多还原