摘要
以野外调查和遥感影像为主要信息源,结合统计资料和基础地理信息数据,研究了20世纪80年代中期以来黄河源头地区土地覆盖格局的空间特征以及动态变化趋势,探讨了导致黄河源区生态环境变化的主要影响因素。研究结果表明,黄河源头地区土地覆盖类型的斑块密度变化差异明显;土地利用类型的镶嵌格局在空间和时间上均有变化。占据优势的草地生态系统20年来遭受不同程度破坏,黄河源区的气候呈暖干化趋势,研究区域土地覆盖类型空间结构变化明显;高寒环境和气候演化趋势对土地覆盖的变化起决定性作用。
Based on the Landsat TM/ETM＋ images and field survey data,the characteristics changes of land-cover pattern and spatial variation have been studied with the aids of 3S techniques in the source regions of the Yellow River since the mid-1980s.Then change trends of spatial pattern were analyzed in the study area.Influencing factors of ecological environment diversion in the source areas were discussed.The results indicated that patch density changes of land types were observed in the source regions of the Yellow River.The dominant grassland was destroyed to some extent in the recent 20 years.The climate in two source region has become warmer and drier in the recent 20 years due to the global warming;the regional land cover change of spatial structure is obvious.The alpine environment and trend of the climatic changes were the decisive factors affecting grassland ecosystem.
出处
《生态科学》
CSCD
北大核心
2013年第1期98-103,共6页
Ecological Science
基金
国家高分辨率对地观测系统重大专项-环境保护遥感动态监测信息服务系统先期攻关(E0203/1112-06)
高等学校学科创新引智计划(B08044)(985Ⅲ)
关键词
土地覆盖
时空变化
黄河源区
land cover
temporal and spatial variation
Yellow River headwaters region
