土壤呼吸的水热因子模拟及温度敏感性的探讨  

Simulation of Hydro-thermal Factors of Soil Respiration and Discussion on the Temperature Sensitivity

作　　者：邓爱娟[1] 申双和[1] 张雪松[1] 李永秀[1] 谢轶嵩[1] 

机构地区：[1]南京信息工程大学应用气象学院,江苏南京210044

出　　处：《安徽农业科学》2009年第23期11133-11136,共4页Journal of Anhui Agricultural Sciences

基　　金：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)

摘　　要：[目的]研究水热因子对土壤呼吸的影响,进而对土壤呼吸温度敏感性进行探讨。[方法]利用LICOR-8100对华北平原典型冬小麦拔节期土壤呼吸进行测定,分析其与水热因子的关系并建立关系模型。[结果]土壤呼吸速率与气温、5 cm层土壤温度均呈显著正相关,且与土壤温度相关性更好,温度对土壤呼吸的影响在低温时比高温时更为显著;按不同温度条件划分的5 cm土壤相对含水量与土壤呼吸速率呈显著正相关,且温度较高时土壤呼吸对土壤含水量变化的响应更显著。[结论]土壤呼吸速率的水热因子关系模型为R=0.180×T0s.878×T0a.088×θ0.147(R2=0.836,P<0.000 1),土壤呼吸温度敏感因子Q10和土壤温度、气温呈负相关,与土壤含水量呈正相关关系。[ 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 soft 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 ×Ts^0.878×Ta^0.088×θ^0.147 （ R^2 = 0. 836,P 〈 0.000 1 ）. Temperature sensitivity of soil respiration Q10 showed a significant negative correlation with soil temperature and air temperature, but positive with soil moisture.

关 键 词：土壤呼吸 土壤温度 土壤含水量 气温 Q10 

分 类 号：S154.2[农业科学—土壤学]