中文摘要：

基于14年的SPOT NDVI影像,分析了内蒙古1998-2011年生长季NDVI变化,在大尺度上对退耕还林（草）工程效果进行了初步检验。结果表明：（1）在内蒙古东南部的通辽市东南部及赤峰南部,中西部的土默特平原、河套地区和鄂尔多斯东部等区域的退耕还林（草）工程区,植被持续增加,植被恢复显著;（2）植被显著恢复的主要是农用地/自然植被镶嵌、草地和稀疏灌丛和稀疏植被区,工程使局部生态环境得到改善;（3）在内蒙古东南部的赤峰和通辽南部、土默特平原、鄂尔多斯市和河套地区等工程区,植被的改善与生态工程建设有关,规模和效益成正比,在中西部的乌兰察布市效果不明显,整体上植被没有较大的改善。研究在较大尺度上证明了内蒙古部分旗县实施退耕还林（草）工程后局部生态环境得到改善。

英文摘要：

Vegetation restoration through time series SPOT NDVI （Normalized Differential Vegetation Index） in Green-for- grain Project areas of Inner Mongolia in 1998-2011 was analyzed by linear regression. The results showed that in Green-forgrain Project areas, including the southeast （southeast of Tongliao and south of Chifeng） and the midwest （Tumote Plain, Hetao Plain and the eastern Erdos） of Inner Mongolia, the sum of NDVI during growing seasons grew significantly. Statistically significant vegetation growth was found in regions of Green-for-grain Project located in areas identified as cropland/natural vegetation mosaic, grasslands, open shrublands and barren or sparsely vegetated, and regional degraded eco-environment was benefited from the Project. The Project, carried out in the southeast （southeast of Tongliao and south of Chifeng） and the midwest （Tumote Plain, Hetao Plain and the eastern Erdos） of Inner Mongolia, brought out ecological benefits directly proportional to their magnitudes;while the Project was not so successful in Ulanqab, where vegetation covers were not improved. This study showed that Green-for-grain Project improved macro-scale eco-environment in some counties （banners）.