草业科学2011，Vol.28Issue(11)：2016-2025,10.
1981-2001年内蒙古草地净初级生产力时空变化特征
Spatial and temporal variation of net primary productivity in Inner Mongolian grassland from 1981 to 2001
摘要
Abstract
With remote sensing and climatic data, CASA model was applied to simulate spatiotemporal variations of grassland net primary productivity （NPP） in Inner Mongolia from 1981 to 2001. Impacts of climatic factors and human activities on the grassland NPP were primarily distinguished via statistical analysis. The results showed that from 1981 to 2001, approxmiately 69 of the grassland NPP had no significant change, while about 30 % of the grassland obtained NPP increment and only about 1 %of the grassland experienced a process of NPP decrease. Spatially, the NPP in northeastern, southeastern and southern part of Inner Mongolia significantly increased, but in boundary areas of the desert steppe and typical steppe in the central region of Inner Mongolia, the grassland degraded in term of NPP change. For the whole region, NPP of Inner Mongolian grassland showed a slightly increasing but not statistically significant trendthe long term averaged seasonal NPP between July and August is 192.0 g/m^2 （150.5-255.5 g/m2）. There was a significant positive correlation between NPP and precipitation, but increased temperature had the effect to cause NPP decreasing. The solar radiation in this region showed no obvious correlation with the grassland NPP. Human activities had determinative impacts on grassland NPP on local scale. While grazing strength represented by livestock density intensified during the two decades in Tumote Left Banner and Tumote Right Banner, the grassland NPP there decreased rapidly and remarkably.关键词
CASA模型/草地/净初级生产力/时空变化/内蒙古Key words
CASA model/grassland/net primary productivity （NPP）/spatiotemporal variation InnerMongolia分类
农业科技引用本文复制引用
王国成,张稳,黄耀..1981-2001年内蒙古草地净初级生产力时空变化特征[J].草业科学,2011,28(11):2016-2025,10.基金项目
国家重点基础研究发展计划项目 （）
