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中国沙漠 ›› 2010, Vol. 30 ›› Issue (2): 254-259.

• 沙漠与沙漠化 • 上一篇    下一篇

西北地区植被变化对风沙活动的影响分析

张彩霞, 王训明, 郭 坚   

  1. 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
  • 收稿日期:2009-07-28 修回日期:2009-08-15 出版日期:2010-03-20 发布日期:2010-03-20

Effects of Vegetation Change on Wind-sand Activity in Northwestern China

ZHANG Cai-xia, WANG Xun-ming, GUO Jian   

  1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2009-07-28 Revised:2009-08-15 Online:2010-03-20 Published:2010-03-20

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。

关键词: NDVI, 风沙活动, 沙尘暴, Kendall相关系数

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.

Key words: NDVI, wind-sand activity, dust storm, Kendall correlation

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