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《Acta Prataculturae Sinica》 2017-01
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Spatio-temporal dynamics of grassland net primary productivity and its response to climate change in the Temperate Eurasian Steppe 1982-2008

CHEN Yi-Zhao;LI Jian-Long;SUN Zheng-Guo;GANG Cheng-Cheng;Joint Innovation Center for Modern Forestry Studies;College of Biology and the Environment,Nanjing Forestry University;School of Life Science,Nanjing University;College of Prataculture Science,Nanjing Agriculture University;Institute of Soil and Water Conservation,Northwest Agriculture & Foresty University;  
The Temperate Eurasian Steppe(TES)is the world's largest continuous vegetation transition zone.Made up mainly of the Kazakh and Mongol Steppe.TES is a typical arid/semi-arid zone and sensitive to climate change.However,little is known about its net primary productivity(NPP),especially for the Kazakh Steppe.In this study,an improved boreal ecosystem productivity simulator(BEPS)model was used to simulate NPP inTES from 1982 to 2008.The BEPS algorithms for maximum carboxylation efficiency and autotrophic respiration were improved to make them more applicable to arid/semi-arid regions and then validated by long-term field observations in Kazakhstan,Inner Mongolia and Xinjiang.Results indicated that the improved model could enhance NPP simulation.Over the 27-year period from 1982 to 2008,the average TES NPP was 120 g C/m~2,of which 116.9g C/m~2 was located in the Mongol Steppe and 122 g C/m~2 in the Kazakh Steppe.In a context of a regional"warming and drying"trend,the Mongol Steppe exhibited an obvious increasing NPP trend for the entire study period,while NPP in the Kazakh Steppe increased before 1991 and then decreased.The regional NPP showed a significant positive correlation with precipitation but was weakly correlated with temperature,suggesting that precipitation is the primary climatic factor that impacts regional grassland growth.
【Fund】: APN全球变化基金项目(ARCP2015-03CMY-Li&CAF2015-RR14-NMY-Odeh);; 江苏省农业三新工程项目(SXGC[2014]287);; 江苏省自然科学基金项目(BK20140413);; 国家重点基础研究发展计划(973计划)项目(2010CB950702);; 江苏高校优势学科建设工程资助项目(PAPD);; 国家重点研发计划(2016YFA0600202)资助
【CateGory Index】: Q948.1
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