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《Journal of Anhui Agricultural Sciences》 2009-23
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Simulation of Hydro-thermal Factors of Soil Respiration and Discussion on the Temperature Sensitivity

DENG Ai-juan et al(College of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing,Jiangsu 210044)  
[Objective] The research aimed to study the effects of hydro-thermal factors to soil respiration.[Method] Experiments were conducted in North China Plain during winter wheat's jointing stage by LICOR-8100 to investigate the relationship between soil CO2 emission and hydro-thermal factors.[Result] Significant power function can be obtained to express soil respiration rate increases with air temperature or soil temperature in 5 cm depth,and it was better with the latter.The influence of temperature was more conspicuous at lower temperature whether air or soil temperature.If it was divided based on different temperature,it showed significant positive relationship between soil water content in 5 cm depth and soil respiration rate,and a remarkable response can be found with higher temperature.[Conclusion] The relationship between soil respiration rate R and air temperature,soil temperature and soil moisture in 5 cm depth can be described by a multiple regression equation: R=0.180×T0.878s×T0.088a×θ0.147(R2= 0.836,P0.000 1).Temperature sensitivity of soil respiration Q10 showed a significant negative correlation with soil temperature and air temperature,but positive with soil moisture.
【Fund】: 国家自然科学基金项目(40675067);; 中国科学院生态系统网络观测与模拟重点实验室开放基金课题(LENOM07YC-02);; 江苏省普通高校研究生创新计划项目(CX08B-019Z)
【CateGory Index】: S154.2
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