作　　者： ; ; ;

机构地区： 中国科学院东北地理与农业生态研究所

出　　处： 《土壤通报》 2011年第3期654-658,共5页

摘　　要： 通过15年长期定位试验,研究了不同施肥管理对黑土活性有机碳库的形成及碳库管理指数(CMI)的影响。结果表明,土壤有机碳、活性有机碳及CMI发生了显著的变化。与原始土壤相比,在东北黑土区经过15年的施有机肥及NPK化肥(NPKOM)与NP2K、NPK处理,土壤有机碳含量显著提高,其余处理间差异不显著。除NPKOM处理外,其余各处理土壤的CMI均呈下降趋势。不同活度的活性有机碳含量比较发现总体趋势为高活性有机碳<中等活性有机碳<惰性有机碳,各处理之间的变化趋势大体相同为NPKOM>NPK>NP≈NP2K>NK≈N2PK>PK>CK。从回归方程的分析可知,土壤中高活性有机碳的变化可以解释阳离子交换量变化的89.5%,交换性Ca含量变化的78%,交换性Mg含量变化的70.6%。从相关分析表明,作物产量,CMI和各处理的土壤中高活性有机碳含量呈极显著相关。 The effects of fertilization on black soil labile organic carbon and carbon management index（CMI） were studied through a long-term fertilization experiment.Through the 15-year long-term experiment,the results showed that soil organic carbon,active organic carbon and CMI had undergone significant changes.Compared with the original soil,in the NPKOM and NP2K,NPK treatments,soil organic carbon content was significantly increased and there was no significant difference among others treatments.Except for NPKOM treatment,the others treatments had a declining trend of the CMI in the soil.The results of different labile organic carbons showed general trend of high-labile organic carbonmiddle-labile organic carboninert labile organic carbon.The organic carbon content in different treatments arranged as NPK NOMNPKNP≈NP2KNK≈N2PKPKCK.The regression equation analysis showed that high-labile organic carbon changes could explain changes of cation exchange capacity in 89.5%,exchangeable-Ca content in 78%,and exchangeable-Mg content in the 70.6%.The correlation analysis showed that crop yields,CMI and high-labile organic carbon content had highly significant correlations.

关 键 词： 黑土 活性有机碳 碳库管理指数

领　　域： [环境科学与工程]