32a来气候扰动下中国沙质荒漠化动态变化  

Dynamics of Sandy Desertification Under Climate Disturbance in China from 1975 to 2007

作　　者：崔瀚文[1] 姜琦刚[1] 邢宇[1] 徐驰[1] 林楠[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2013年第2期582-591,共10页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局专项资助项目(1212010911084)

摘　　要：借助遥感、GIS技术,利用1975年MSS、2000年ETM和2007年CBERS数据、气温和降水数据,采用基于像元的灰色关联度方法,研究1975—2007年气候因素扰动下中国沙质荒漠化时空变化规律。研究结果表明,中国沙质荒漠化虽然在2000—2007年面积减少、程度减轻,但在1975—2007年面积依然呈小幅增加趋势(增加面积为6 179.8km2,其中重度沙质荒漠化增加面积最大),程度加重。通过对内蒙古、新疆2个典型区的灰色关联度分析,进而研究全国范围可知,气温对沙质荒漠化变化的作用(沙质荒漠化减轻/加重与气温的相关系数分别为0.973,0.976)大于降水(沙质荒漠化减轻/加重与降水的相关系数分别为0.884,0.882)。气候因素扰动下,沙质荒漠化变化的总体趋势为,沙质荒漠化与气温变化呈正比,与降水呈反比。该趋势以甘肃、陕西为界,界线以西较为明显,而最显著区集中在新疆北部、东部,西藏北部。Based on desertification in China u during the recent 32 yea RS and GIS technologies, the temporal and spatial dynamics of sandy nder climate disturbance were studied by pixel based grey correlation method rs. The data used in this paper incorporated MSS imageries in 1975, ETM imageries in 2000, CBERS imageries in 2007, temperature, and precipitation data. The results showed that the area and degree of sandy desertification reduced from 2000 to 2007, but, still showed slightly increasing trend from 1975 to 2007. Over the past 32 years, the whole area increased 6 179.8 km2 , and the greatest increased area occurred in heavy desertification. With the application in Inner Mongolia and Xinjiang, the grey correlation analysis in China indicated that, compared with precipitation（0. 884, 0. 882）, temperature played a more important role （0. 973, 0. 976） in sandy desertification change. Under the disturbance of climate factors, the general tendency of sandy desertification was positively correlated with temperature and negatively related to precipitation. The tendency was more distinct in the west of Gansu and Shaanxi. The most obvious area concentrated in the north and east of Xinjiang, and the north of Tibet.

关 键 词：沙质荒漠化 气候变化 遥感 GIS 空间相关分析法 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] X171.1[自动化与计算机技术—控制科学与工程]