摘要
青海湖环湖区是青藏高原土地沙漠化最为严重的区域之一。基于RS和GIS技术,选取1976、1987、1995年和2006年4期遥感影像,利用ERDAS的图像和信息处理功能对环湖区1.43万km2的土地进行专题信息提取,采用室内解译和野外检验修正的方法重建了环湖区近30a来的沙漠化土地时空动态变化和分异格局,并在此基础上预测了未来20a沙漠化土地的发展趋势。研究结果表明,近30a来本区沙漠化在时间上表现为快速增加-缓慢上升-快速增加的持续扩展过程;在空间上由少成片分布或多零星分布向以4大沙区为主、滨湖沙堤为连线的环湖带状分异格局演变。受气候变化、人类活动和人工治理的综合影响,未来20a该区沙漠化面积在前15a呈增长趋势,后增长缓慢并出现逆转。
The area around Qinghai Lake is one of the most serious desertification regions in Qinghai Plateau.In this paper,landsat remote sensing imageries and GIS analysis are used to obtain spatial-temporal changes and differentiation pattern data of aeolian desertification lands around Qinghai Lake of about 14 300 km2 in 1976,1987,1995 and 2004.Meanwhile,we forecast the development trend of aeolian desertification lands in next 20 years.Results show that the area of aeolian desertification lands around Qinghai Lake has experienced a sustained expansion process of three phases,which are rapid development→slow development→fast development in order;the spatial pattern of desertification land evolved from little patchy pattern or scattered distribution to zonal differentiation pattern which includes four main sandy dune regions connected by lakeshore sand.Due to climate change,human activities and artificial control effect,the desertification land area around Qinghai Lake will still show an upward trend in the next 15 years,but the area of desertification lands around Qinghai Lak will reduced after 2021.
出处
《中国沙漠》
CSCD
北大核心
2012年第4期901-909,共9页
Journal of Desert Research
基金
国家自然科学基金项目(40761026
41161036)
国家科技支撑项目(2007BAC30B03)
甘肃省自然科学基金项目(1010RJZA016)共同资助
关键词
青海湖
土地沙漠化
动态变化
遥感
GIS
Qinghai Lake
aeolian desertification
dynamic change
remote sensing
GIS
