摘要
针对元谋干热河谷植被变化问题,选择多种遥感数据提取NDVI,基于DEM生成地形因子,应用GIS叠加分析其变化特征。结果表明:近30a来,元谋干热河谷植被变化经历先剧烈退化后缓慢恢复过程;而且恢复期内,中山区、中高山区、平坡和无坡向恢复效果显著且持续稳定,平坝区、缓坡、斜坡、半阴坡和阴坡强烈的恢复过程伴随有强烈的退化过程,低山丘陵区、中低山区、陡坡、险坡、阳坡和半阳坡均又出现退化趋势,中高山区、险坡和阴坡对植被破坏与恢复重建响应最迅速;植被恢复的空间差异和可持续性差异显著。
Choosing Yuanmou dry-hot valley as a study area,MSS,TM,ETM and CBERS-2CCD images as data source,we extracted apparent reflectance,NDVI,three topographic factors from DEM,and applied GIS overlay method to analyze vegetation change process.Results showed that over the past 30years,vegetation change of Yuanmou dry-hot valley went through a slow recovery after severe degradation.During this peri-od,recovery results of such elevation zones as 1 600～2 000m,≥2 000m,slope zone as≤5°,and aspect zone as-1were obvious and continuous stability.While in the elevation zone of≤1 100m,slope zones of 5～10°and 10～25°,and aspect zones of 292.5～337.5°,67.5～112.5°,337.5～22.5°and 22.5～67.5°,a strong recovery process was accompanied by a strong degradation process.Those elevation zones of 1 100～ 1 350mand 1 350～1 600m,slope zones of 25～35°and≥35°,and aspect zones of 157.5～202.5°,202.5～ 247.5°,247.5～292.5°,and 112.5～157.5°showed degradation trends after 1999.Response rate of vegetation destroy or recovery in the elevation zone of≥2 000m,slope zone of≥35°,and aspect zones of 337.5～ 22.5°and 22.5～67.5°were the highest.On the whole,differences of vegetation restoration spatial pattern and sustainability in different topographic conditions are significant,and adjustments and optimizations of restoration countermeasures should be targeted in time.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2010年第11期1309-1313,共5页
Resources and Environment in the Yangtze Basin
基金
国家支撑计划项目(2006BAC01A11)
国家重点基础研究发展计划(973)项目(2007CB407206)
