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《Ecology and Environment》 2008-05
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Variation of net primary productivity of Grassland and its response to climate in Inner Mongolia

Li Gang1,2,3,Zhou Lei1,2,3,Wang Daolong3,Xin Xiaoping1,2,3, Yang Guixia1,2,3,Zhang Hongbin1,2,3,Chen Baorui1,2,3 1. Key Lab of Resources Remote Sensing and Digital Agriculture,Ministry of Agriculture,Beijing 100081 China;2. Hulunbeier Grassland Ecosystem Research Stat ion,Hailaer 100081 China;3. Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences,Beijing 100081,China  
Net Primary Productivity is a key indicator to evaluate the productivity of vegetation community in natural environment. The variation of NPP,which directly reflects the ecosystem response to climate,could be an indicator of the ecosystem response to climate changes. Using remote sensing data and ground meteorological station data,we estimated NPP of grassland during the grow-ing season from 1982 to 2003 in Inner Mongolia using the light use efficiency model proposed by Montieth in 1972,and calculated several climatic factors which are closely related to NPP. We analyzed the annual NPP variations of grassland in Inner Mongolia from1982 to 2003,as the climate factors,and analyzed the relations between the NPP and climate factors. The results showed that the NPP of grassland was increased fluctuations during growing season in Inner Mongolia from 1982 to 2003,and the average increase rate is 0.003 6 g C·m-2·Gr-1. The spatial correlation between NPP,Biological Temperature(BT) and Potential Evapotranspiration Rate(PER ) is significant negatively,and significant positive with rainfall(RAIN) ,moisture humid(K) and Actual Evapotranspiration(AE) .In Inner Mongolia,The NPP of grassland was most impacted by RAIN and BT,more obviously by RAIN. Different type grassland's NPP responded slightly different to climate changes in Inner Mongolia.
【Fund】: 国家高技术研究发展计划(863)项目(2007AA10Z230);; 国家科技支撑计划项目(2006BAC08B0404;2006BAD16B05-2;2006BAC01A12)
【CateGory Index】: S812.1
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