摘要
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.
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 2.2×10^-4 · d-1, 6.0×10^-4 · d^-1, and 3.4×10^-4· d^-1, respectively. The decomposi- tion 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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第10期2251-2255,共5页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目(2005CB121101)
中国博士后科学基金资助项目(20060400735).
关键词
培育实验
土壤类型
有机碳
分解速率
incubation experiment
soil type
organic carbon
decomposition rate.
