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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。
Based on the 14-year SPOT NDVI images, the NDVI changes in Inner Mongolia during the growing season from 1998 to 2011 were analyzed, and the effects of returning farmland to forest project on a large scale were preliminary tested. The results show that: (1) In the area of returning farmland to forest (grassland) in southeastern Tongliao City, south of Chifeng, the central and western Tumote Plain, Hetao area and eastern part of Ordos, vegetation continues to increase and vegetation recovery Significant; (2) The main restoration of vegetation was farmland / natural vegetation mosaic, grassland and sparse shrubs and sparse vegetation area, the project to improve the local ecological environment; (3) in the southeastern Inner Mongolia Chifeng and southern part of Tongliao Merter Plain, Ordos and Hetao areas and other engineering areas, the improvement of vegetation is related to the construction of ecological engineering. The scale and benefit are directly proportional. The effect of Wulanchabu is not obvious in the central and western parts of China. There is not much improvement on vegetation as a whole. The research proves on a large scale that the local ecological environment has been improved after the project of returning farmland to forestry and grassland has been implemented in some prefectures and counties in Inner Mongolia.