中文摘要：

本 文基于2001 -2013年 MODIS NDVI多时序遥感影像,利用像元二分模型估算植被覆盖度,以湖南 省14个地州市为对象进行统计,并探讨植被覆盖度变化产生的人为原因.结果表明（1）整体上,近13年湖南省各 市州植被覆盖度水平均较高,波动幅度较小;（2）湖南省西部各市州植被覆盖度水平略高于东部各市;（3）湖南省 植被覆盖度变化大致以112°E 为界,以西呈增加趋势,以东则表现为衰减趋势;（4 ）湖南省植被覆盖度变化显著增 加的面积明显小于显著减少的面积;（5）植被覆盖度的短期变化受人类活动影响较大.

英文摘要：

Based on the multi-temporal MODIS NDVI data for the period from 2001 to 2013 , in this work, we estimated the vegetation coverage in Hunan province. Taking 14 administrative districts of the studied area as exam-ples, we systematically conduct statistic studies on vegetation coverage. Our results show that （1 ） overall, the vegetation coverage was relatively high when changes were not significant over the span of 13 years （2001 -2013）; （2） the vegetation coverage of western Prefecture-level cities and West Hunan Tujia and Miao Autonomous Prefec-ture was slightly higher than that of eastern regions; （ 3 ） the change tendency of the vegetation coverage was ap-proximately divided by 112° E , with regions located in the west of the line showed an increase whereas others dem-onstrated a reduction; （4） the area with significant increase of vegetation coverage was much smaller than that with significant reduction ; and （5 ） it is noteworthy that human activities are the major driving force behind the spatial- temporal pattern variations for the vegetation coverage in the studied area during a relative short time period.