闽北毛竹林土壤有机碳含量特征及其影响因素

Characteristics of Soil Organic Carbon Content and Its Influencing Factors of Phyllostachys edulis Forest in North of Fujian Province

以闽北毛竹林为研究对象,通过野外调查获取林分、地形和土壤相关基础数据,分析毛竹林土壤有机碳含量与林分因子及地形因子间的关系,探讨毛竹林土壤有机碳含量的主要影响因子。结果表明:闽北毛竹林土壤有机碳含量随土层深度的增加而逐渐减小,总体均值为(25.55±12.05)g·kg^(-1),变异系数为47.16%;不同土层中,毛竹林土壤有机碳含量与立竹度和海拔呈正相关关系,与叶面积指数和坡度呈负相关关系,且下坡位大于上坡位,阴坡高于阳坡。逐步回归分析和通径分析结果表明,海拔、立竹度和叶面积指数是毛竹林土壤有机碳含量的主要影响因子,并构建利用海拔、立竹度和叶面积指数估算闽北毛竹林土壤有机碳含量的回归方程。该结果对准确估算森林碳储量具有重要意义。

The relationship between soil organic carbon content and forest factors and topographical factors was analyzed to discuss main influencing factors of soil carbon content by acquiring stand,terrain and soil related data on the basis of Phyllostachys edulis forest in the north of fujian province.The results showed that contents of soil organic carbon of Phyllostachys edulis forest in the north of Fujian decreased with increased soil depth,its whole mean was（25.55±12.05） g·kg^（-1） and coefficient was 47.16%;in different soil layers,soil organic carbon content of Phyllostachys edulis forest was positively correlated with the culm density and the elevation while negatively correlated with the leaf area index and the slope,and downslope was more than upslope while shady slope was more than sunny slope.Results of stepwise regression analysis and path analysis showed that the main influence factors of soil organic carbon content were elevation,culm density and leaf area index that were used to construct the regression equation of soil carbon content of Phyllostachys edulis forest in the north of Fujian.The results are important for estimating forest carbon stocks accurately.