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干燥和重新湿润过程引起土壤CO_2激发释放的模拟研究

Keywords: 短期培养,土壤干燥和重新湿润,CO_2激发释放,动力学

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Abstract:

应用短期培养实验研究了干燥和重新湿润引起的土壤CO2激发释放及其动力学过程。结果表明,不经干燥和重新湿润处理土壤CO2释放速率基本不随时间变化,其CO2释放过程可以用零级反应动力学方程(Y=k0t)描述;干燥和重新湿润处理过程能够引起明显的土壤CO2激发释放,这是干燥和重新湿润引起的土壤呼吸激发效应(一级反应)和土壤基本呼吸(零级反应)相互叠加的结果,可以用两库叠加模型Y=at+A0(1-e-kt)很好描述。本实验条件下扰动、干燥和重新湿润引起的土CO2净激发释放量为23.05~59.90mgCO2-C·kg-1,主要与不同培肥措施长期实施造成的土壤性质和肥力差异,特别是有机质数量和质量的差异有密切关系。

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