中文摘要：

利用2000-2014年MODIS NDVI产品,基于像元二分模型计算重庆市近15年来的植被覆盖度,并对其变化强度以及变化趋势进行了分析。结果表明,重庆市植被状况良好,2000-2014年平均植被覆盖度为65.24%,其中2014年为67.48%;渝东北、中部偏东和偏南地区植被覆盖度相对较高,渝西地区较低,主城区最低。尽管气象条件的年际变化造成植被覆盖度的起伏波动,但自2000年以来,全市植被覆盖度总体呈波动上升趋势,共增长了5.88%,平均年变化率为0.42%;境内91.03%的区域植被覆盖度有不同程度改善,其中,中度以上改善的区域占64.30%。以各区县为监测空间单位,各地植被覆盖度的变化趋势虽然不尽相同,但基本都保持增长的变化趋势,年平均增长率最高的区县为渝中区、长寿区、巴南区、合川区等。

英文摘要：

Vegetation,as one of the most important part of terrestrial ecosystems,has a great impact on the global climate change and hydrological cycles. A useful indicator to evaluate the vegetation condition in land surface is the fractional vegetation coverage（ FVC）. In this research,the MODIS data from 2000 to 2014 year was employed to derive FVC basing on dimidiate pixel model,and then its change trend and intensity were analyzed using unitary linear recursive analysis and standard deviation. The result showed that：（ 1） The average FVC in Chongqing was 65. 24% over the past 15 years and it was 67. 48% in2014 a.（ 2） The FVC was highest in northeast,middle slanting east and south,and followed by that in the west of Chongqing,while the lowest was found in main urban city.（ 3） The quantity of FVC fluctuated but was with an increasing trend of 5. 88%in total since 2000 a,and the average rate of change was 0. 42% per year. Besides,the FVC in 91. 03% of the study areas improved with varying degree,and the regions occupied by moderate improvements accounted for 64. 30%.（ 4） Taking each district as an observational cell,it displayed a different change trend of FVC. However,all trends maintained upward,and the highest average annual rate of growth was the Yuzhong district,Changshou District,Banan District,and Hechuan district.