不同类型土壤有机碳分解速率的比较

通过室内培育实验研究了黑土、潮土和红壤有机碳的分解速率.结果表明:不同类型土壤有机碳的分解速率常数存在显著差异(P<0.05),黑土、潮土和红壤有机碳的分解速率常数分别为2.2×10-4.d-1、6.0×10-4.d-1和3.4×10-4.d-1.回归分析发现,土壤pH与有机碳分解速率常数呈极显著相关关系,pH<5.5或>8.0时,分解速率常数均大幅提高.土壤中粘粒 粉粒含量与3种类型土壤有机碳的分解速率常数呈极显著负相关,表明粘粒 粉粒含量是3类土壤有机碳分解速率存在差异的主导因子.

Organic carbon decomposition rate in different soil types

With incubation experiment, this paper studied the decomposition rate of organic carbon in black soil, fluvo-aquic soil, and red soil. It was shown that these three soil types had significantly different decomposition rate constant of organic carbon (P < 0.05 ), with the corresponding value being 2.2 x 10(-4) x d(-1), 6.0 x 10(-4) x d(-1), and 3.4 x 10(-4) x d(-1), respectively. The decomposition rate constant had a significant correlation with soil pH, which was increased greatly when the soil pH was < 5.5 or > 8.0, and a significant negative correlation with the contents of soil clay and silt, indicating that soil clay and silt content was one of the dominant factors affecting the decomposition rate of organic carbon in these soil types.