| 沙漠与沙漠化 |
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| Effects of Vegetation Change on Wind-sand Activity in Northwestern China |
| 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 is -0.437(99% confidence level), -0.338(95% confidence level), and -0.251(90% confidence level), respectively. The correlation between NDVI and wind-sand activity index varies with different seasons and with terrains. The correlation is most significant in hill-lowland-valley.
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Received: 28 July 2009
Published: 20 March 2010
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zhangcaixia06@mails.gucas.ac.cnP461.7
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2010, Vol. 30 
