摘要
基于1981～2004年多年遥感监测数据和气象数据以及其它相关数据,采用CASA(Carnegie-Ames-Stanford Approach)模型估算藏北地区草地植被净第一性生产力(NPP),分析草地植被NPP变化趋势的空间格局及其对人类活动强度的响应。结果表明:近24a以来,藏北绝大部分区域(约占草地总面积的88.61%)草地植被NPP变化趋势不明显;而草地植被NPP变化趋势显著的区域仅占草地总面积的11.39%,其中显著降低约占11.30%,显著增高仅占0.09%。在藏北地区,高海拔区域有较大比例(大于26%)的草地NPP显著降低;坡度在15～30°之间区域的草地NPP变化幅度较大;而坡向对草地NPP变化趋势的影响不大。藏北地区居民点对草地NPP变化趋势的负面影响小于道路影响;从综合影响来看,离道路和居民点越近、人类活动强度及其对草地NPP变化趋势的影响越大,尤其是草地NPP显著增高区域只分布在人类活动强度最大的第一个缓冲区内。
According to remote sensing data climatic data and other related data in Northern Tibet from 1981 to 2004, using CASA （ Carnegie-Ames-Stanford Approach） model estimated the NPP of alpine grassland in the Northern Tibet and analyzed the spatial pattern of changing tendency for the alpine grassland NPP and its response to human activity intensity based on GIS technique. We found that the change tendency of alpine grassland in most area of Northern Tibet was not obvious, which occupied approximately 88.61% of total grassland area; while that changing remarkable region only accounts for 11.39% , and among these 11.30% decreased significantly, while and 0.09% increased. In Northern Tibet, the alpine grassland NPP for high elevation region has a greater proportion （ bigger than 26% ） to fall down, that in the region of slope between 15- 30° change bigger, and aspect has little influence on change tendency of the alpine grassland NPP. The negative effect of local residential area to the grassland NPP change tendency is smaller than that of road. From synthesis affects that, the intensity of human activity in the region near to road and the residential area are strong and influence on grassland NPP change tendency are bigger also. The grassland NPP remarkably increased region the the onlydistributed in first buffer outside where the human activity intensity is biggest particularly.
出处
《生态学报》
CAS
CSCD
北大核心
2007年第11期4612-4619,共8页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(40775062)
国家重点基础研究发展规划资助项目(2002CB412508)
西藏那曲地区与中国农业科学院合作资助项目~~
