摘要
土地利用/覆被是全球变化和可持续发展研究中的重要问题之一。若尔盖位于青藏高原东北边缘,是全球变化的敏感响应地带,近年来因其沙化、湿地变化而受到广泛关注。以若尔盖地区土地覆被变化为研究对象,分别选取了1987、1996和2001年的Landsat5 TM影像,根据野外标志解译出土地覆被类型,并采用Moran I指数揭示其空间分布特征。结论表明,在研究时段中各种土地覆被类型具有不同程度变化,其中沼泽和沙地的变化范围分别为31.86km2,7.83km2,增长比较显著的是沙地、居民点及建设用地、撂荒地;不同时段的Moran I指数均为0.05,表明若尔盖近期土地覆被的分布属于随机类型的。在降水没有明显增加的背景下,气温渐次升高是若尔盖土地覆被变化的主要自然因子。研究结果揭示了整个若尔盖地区的土地覆被类型及其变化;讨论了沙化现象及其防治,对全球变化的区域响应和区域环境保护具有积极意义。
Land use/cover is a pivotal problem in the study of global changes and sustainable development.Roige locates at the northeast front of Tibet Plateau,sensitive to global changes,and recognized by its sandy desertification and wetland changes.Based on field work,concentrated on land cover changes in Roige and using Landsat 5 images in 1987,1996 and 2001,this paper provides Roige land cover categories and their distribution by Moran I index.The results indicates that land cover change obviously in study period while wetland has an extent of 31.86 km2,sandy land 7.83 km2,and great changes are prominent in growing up of sandy land,inhabitant land and waste land.Moran I is 0.05 in each period and it shows land cover categories distribute stochastically.Because precipitation quantity increases inconspicuously,gradually growing of temperature becomes the major factor of land cover changes in Roige.This paper studies land cover changes in whole Roige,discusses sandy desertification and its countermeasures,and is positive to global change research and regional environmental protection.
出处
《山地学报》
CSCD
北大核心
2008年第4期496-502,共7页
Mountain Research
基金
四川师范大学重点课题"川西北若尔盖湿地近期土地利用变化的水文效应研究"
四川省教育厅重点项目(2005A091)资助~~
关键词
若尔盖
土地覆被
变化
驱动力
退化防治
Roige region
land cover
changes
driving force
degeneration prevention
