西北地区植被变化对风沙活动的影响分析  

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

作　　者：张彩霞[1] 王训明[1] 郭坚[1] 

机构地区：[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

出　　处：《中国沙漠》2010年第2期254-259,共6页Journal of Desert Research

基　　金："三北"防护林工程生态环境效应遥感监测与评估研究项目(KZCX1-YW-08-02-4)资助

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。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.

关 键 词：NDVI 风沙活动 沙尘暴 Kendall相关系数 

分 类 号：P461.7[天文地球—大气科学及气象学]