| 西北地区植被变化对风沙活动的影响分析 |
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| 引用本文： | 张彩霞,王训明,郭坚.西北地区植被变化对风沙活动的影响分析[J].中国沙漠,2010,30(2):254-259. |
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| 作者姓名： | 张彩霞 王训明 郭坚 |
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| 作者单位： | 中国科学院,寒区旱区环境与工程研究所,沙漠与沙漠化重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 三北防护林工程生态环境效应遥感监测与评估研究项目 |
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| 摘 要： | 基于西北地区1982—2003年NDVI与扬沙日数、沙尘暴日数、大风日数等风沙活动数据,分析了植被变化对风沙活动的影响及其区域差异性。结果表明,NDVI正距平和风沙活动因子的负距平有很好的对应关系。年均NDVI和扬沙日数、沙尘暴日数和大风日数的Kendall相关系数分别为-0.437(99%置信水平)、-0.338(95%置信水平)和-0.251(90%置信水平)。NDVI和各风沙活动因子的相关性随季节发生显著变化。各地貌类型区内,低山-丘陵及洼地区NDVI和风沙活动因子相关最为显著。
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| 关 键 词： | NDVI 风沙活动 沙尘暴 Kendall相关系数 |
| 收稿时间： | 2009-7-28 |
| 修稿时间： | 2009-8-15 |
Effects of Vegetation Change on Wind-sand Activity in Northwestern China |
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| ZHANG Cai-xia,WANG Xun-ming,GUO Jian.Effects of Vegetation Change on Wind-sand Activity in Northwestern China[J].Journal of Desert Research,2010,30(2):254-259. |
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| Authors: | ZHANG Cai-xia WANG Xun-ming GUO Jian |
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| Institution: | ZHANG Cai-xia,WANG Xun-ming,GUO Jian(Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China) |
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| Abstract: | On the basis of NDVI and wind data recorded at meteorological stations in northwestern China,the effect of vegetation cover on wind-sand activity and its regional difference were discussed.The results show that vegetation cover is one of the most important inhibiting factors for wind-sand activities.There is close relation between positive NDVI anomaly and negative wind-sand index anomaly.The Kendall correlation coefficient between NDVI and frequency of sand-blowing days,dust storm days and strong wind days... |
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| Keywords: | NDVI NDVI wind-sand activity dust storm Kendall correlation coefficient |
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