| 黑河流域天然植被的面积变化研究 |
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| 引用本文： | 金晓媚.黑河流域天然植被的面积变化研究[J].地学前缘,2005,12(Z1):166-169. |
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| 作者姓名： | 金晓媚 |
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| 作者单位： | 中国地质大学,水资源与环境学院,北京,100083 |
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| 基金项目： | 国土资源部科技专项基金 |
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| 摘 要： | 植被覆盖面积的大小是反映区域性生态环境状况的重要指标之一,多年植被覆盖面积的变化则直观反映了植被生态环境随时间的变化规律。在前人研究成果的基础上,采用定量遥感技术,应用美国国家航天航空局最新的全球植被指数变化研究数据(GIMMS)作为数据源,对黑河流域1989-2002年间的植被面积变化规律进行了研究。考虑到实际的植被面积难以确定,因此采用等效面积法确定植被覆盖面积,通过统计遥感图像上植被指数(NDVI)值大于0.3的像素点值,以像素点值代表植被的面积,研究黑河流域14 a的天然植被面积变化规律。研究结果证明,黑河流域的天然植被在以每年约3%的速度减少。
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| 关 键 词： | 黑河流域 GIMMS NDVI 等效面积法 |
| 文章编号： | 1005-2321(2005)S0-0166-04 |
| 修稿时间： | 2004年10月20 |
The variability of natural vegetation area in the Heihe river basin, north-west China |
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| JIN Xiao-mei.The variability of natural vegetation area in the Heihe river basin, north-west China[J].Earth Science Frontiers,2005,12(Z1):166-169. |
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| Authors: | JIN Xiao-mei |
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| Abstract: | Vegetated areas are important indices for regional eco-environment. The temporal variation of vegetation over a period of many years directly reflects the regulatory influence of vegetation on the ecological-environment. Based on previous-research and using quantitative remote sensing, this paper examines the variability of vegetated areas from 1989 to 2002 in the Heihe river basin, north-west China from GIMMS NDVI data. Owing to the difficulty in ascertaining vegetation area in this paper, we calculate the vegetation area using equivalent area method. The pixels with NDVI value larger than 0.3 in the image are counted and the number of pixels represents the vegetation area. Results indicate that the natural vegetation areas decrease at the annual rate of 3% in the Heihe river basin. |
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| Keywords: | GIMMS NDVI |
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