| 以植被指数0.12为指标看我国的荒漠化与草原界限的变化 |
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| 引用本文： | 王澄海,惠小英.以植被指数0.12为指标看我国的荒漠化与草原界限的变化[J].中国沙漠,2005,25(1):88-92. |
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| 作者姓名： | 王澄海 惠小英 |
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| 作者单位： | 1. 兰州大学,资源环境学院,甘肃,兰州,730000;中国气象局,乌鲁木齐沙漠气象研究所,新疆,乌鲁木齐,830000
2. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 |
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| 基金项目： | 国家重点基础研究发展规划项目(G1999043408)，国家自然科学基金重点项目(90202014)，亚洲季风区海陆气相互作用对我国气候变化的影响(KCX2 SW 210)共同资助 |
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| 摘 要： | 通过对荒漠化描述指标和方法的讨论,最后用植被指数(NDVI)作为描述荒漠化的指标,定性讨论了我国荒漠化和干草原区域近10 a的变化。结果表明,NDVI可以用来作为荒漠化特征的指标,NDVI的0.12线大致与200 mm降水量相对应。近10 a,我国的荒漠化在1998年以后有所扩大。
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| 关 键 词： | NDVI 荒漠化 降水量 |
| 文章编号： | 1000-694X(2005)01-0088-05 |
| 修稿时间： | 2003年9月15日 |
Borderline Variations of Desertification and Grassland over China Viewed from NDVI 0.12 |
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| WANG Cheng-hai.Borderline Variations of Desertification and Grassland over China Viewed from NDVI 0.12[J].Journal of Desert Research,2005,25(1):88-92. |
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| Authors: | WANG Cheng-hai |
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| Institution: | WANG Cheng-hai~ |
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| Abstract: | After discussing and comparing desertification index and rainfall, the NDVI index 0\^12 was used as the dividing borderline between desertification and degenerated grassland. The changes of the borderline in China were qualitatively discussed in recent 20 years. Results showed that NDVI was a perfect index that used to divide the desertification and degenerated grassland area. The 200 mm isohyet corresponds to the \{isoline\} of NDVI 0\^12. The desertification area has been extended since 1998 in the north area from the Yellow River, and the most change locates in the transition zone between agriculture and pasture. |
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| Keywords: | NDVI desertification isohyte |
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