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为了评价土壤性质对土壤有机碳含量的影响,运用通径分析方法研究了江西大岗山杉木人工林下土壤有机碳含量与土壤性质的关系。结果表明:在杉木人工林的整个发育过程中,土壤有机碳含量和土壤各性质表现出明显的规律性变化;土壤性质通过直接作用和间接作用共同影响着土壤有机碳的含量和分解转化方向,但不同土壤性质的影响机理不同。在土壤系统中,碱解氮量、细菌数量和真菌数量以及它们的共同作用决定了土壤有机碳含量的大部分变异,是影响土壤有机碳含量变化的主导因素,有效磷含量和放线菌数量由于直接正效应和间接负效应相抵,因而对土壤有机碳含量的决定程度较小,总孔隙度和速效钾含量对有机碳含量虽也表现出一定的直接效应影响,但影响程度较低;和简单相关或多元回归分析方法相比,通径分析能更加客观和全面地评价土壤性质对土壤有机碳含量的影响作用。
In order to evaluate the impact of soil properties on soil organic carbon content, the relationship between soil organic carbon content and soil properties under Cunninghamia lanceolata plantation in Dagangshan, Jiangxi was studied by using the path analysis method. The results showed that soil organic C content and soil properties showed regular changes throughout the development of Cunninghamia lanceolata plantation. Soil properties affected soil organic carbon content and decomposition direction through both direct and indirect effects, However, different soil properties have different mechanisms of action. In the soil system, the amount of available nitrogen, the amount of bacteria, the number of fungi and their interaction determine most of the variation of soil organic carbon, which is the dominant factor affecting the change of soil organic carbon. The content of available phosphorus and actinomyces Due to the direct positive effect and indirect negative effect offset, the degree of soil organic carbon is less decided. The total porosity and available potassium content also have a direct effect on the organic carbon content, but the degree of influence is low. Compared with simple correlation or multiple regression analysis, path analysis can evaluate the effect of soil properties on soil organic carbon more objectively and comprehensively.