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《Acta Prataculturae Sinica》 2011-04
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Spatial-temporal dynamics simulation of grassland net primary productivity using a satellite data-driven CASA model in Gannan prefecture

WANG Ying,XIA Wen-tao,LIANG Tian-gang(College of Pastoral Agriculture Science and Technology,Lanzhou University,Key Laboratory of Grassland Agro-ecology System,Ministry of Agriculture,Lanzhou 730020,China)  
Net primary productivity(NPP) and its responses to global change are one of the focuses of global change research.Based on GIS technology and remote sensing imagery,the grassland NPP and its spatial-temporal dynamics in Gannan prefecture during 2001 to 2008 were estimated with the Carnegie-Ames-Stanford Approach(CASA) model.Average annual NPP from 2001 to 2008 was 483.41 g C/(m2·a) in the study area.There was obvious seasonal change in the grasslands of Gannan,and the main growth period lasts from 177 to 240 days.There was a rising trend in the grassland NPP of the eight years.Between different grassland types,the trend of rising NPP on lowland meadow was the largest while that on marsh was smallest.Analysis of the temperature and precipitation of the eight years showed that the temporal variation of NPP was mainly influenced by changes of annual precipitation.
【Fund】: 国家高技术研究发展专项(2007AA10Z232);; 教育部科技创新工程重大项目培育资金项目(708089);; 国家科技支撑计划项目(2009BAC53B01)资助
【CateGory Index】: S127
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