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《Acta Agrestia Sinica》 2001-03
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The Rate of Carbon Dioxide Release from Alpine Scrubby Meadow Soil Under Different Grazing Intensity

ZHANG Jin-xia, CAO Guang-min, ZHOU Dang-wei, ZHAO Xin-quan (Northwest Plateau Institute of Biology,Chinese Academy of Sciences,Xining 810001,China)  
The fields experiment was conducted at Haibei research station of alpine meadow ecosystem,Chinese Academy of Sciences.The results indicated that:The rate of CO2 release rate occurred obviously daily change,the daily released CO2 were 7.774±5.577g/m2·d(Lightly grazing)and 6.977 ±4.947g/m2d(Heavily grazing)respectively,its release peak was at 12∶00~14 ∶00 and the valley at 6∶00~8∶00 in the morning.There was significant seasonal dynamic of release rate of CO2,maximum value was in July and minimum in winter.The correlated relationship between daily change in rate of CO2 release and air temperature of soil surface temperature was very significant(P<0.01).The correlation were extreme significant(P<0.01)between seasonal dynamic of rate of CO2 release and air temperature and soil temperture(0~30cm).Heavily grazing make arte of CO2 release decreased.
【Fund】: 国家重点基础研究专项(G1998040800)资助;; 中国科学院知识创新工程项目(KSCX2-1-07);; 国家自然科学基金项目(30070147);; 中国科学院
【CateGory Index】: S155.47
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