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探讨华山松人工林土壤有机碳含量和有机碳密度以及土壤有机碳密度的主要影响因子,为科学评估华山松人工林固碳能力提供依据。在云南玉溪磨盘山森林公园内选择处于中林龄、近成熟林和成熟林的华山松人工林,设置样地并记录样地信息,并取0-60cm土层土样,在实验室测定不同土层的有机碳含量及碳密度。运用主成分分析对华山松林地内的植被因子、地形因子和土壤理化因子进行评价。华山松人工林由中龄林-近熟林-成熟林的发育进程中,土壤有机碳含量和有机碳密度都表现为近成熟林(28.76g·kg-1,128.87t·hm-2)>中林龄(25.70g·kg-1,124.34t·hm-2)>成熟林(25.61g·kg-1,117.49 t·hm-2)。3种林分土壤有机碳含量和有机碳密度都是随土壤深度的增加而逐渐降低。主成分分析表明林木的平均胸径、平均树高、海拔、碳氮比和全氮含量是影响土壤有机碳密度的主导因子。华山松人工林土壤有机碳具有明显的表聚现象,减少人为的不必要干扰,在一定程度上有利于土壤固定更多的碳。
To explore the main influencing factors of soil organic carbon content, organic carbon density and soil organic carbon density in Pinus armandii plantations, and provide the basis for scientifically evaluating the carbon sequestration of Pinus armandii plantations. In the Mopanshan Forest Park of Yuxi, Yunnan Province, Pinus armandii plantations with mid-age, near-mature and mature forests were selected to set up plots and record sample plots. Soil samples from 0-60 cm soil layers were taken and measured in laboratory Soil organic carbon content and carbon density. Principal component analysis (PCA) was used to evaluate the vegetation factors, topographical factors and soil physical and chemical factors in Pinus armandii forest. In the development process of Pinus armandii plantation, the soil organic carbon content and organic carbon density in the middle-aged forest-near-mature forest-mature forest were both near-mature forest (28.76g · kg-1,128.87t · hm-2) (25.70g · kg-1,124.34t · hm-2)> mature forest (25.61g · kg-1, 117.49 t · hm-2). The soil organic carbon content and organic carbon density of three forest types all decreased with the increase of soil depth. Principal component analysis showed that the mean DBH, mean tree height, altitude, C / N ratio and total N content were the dominant factors affecting soil organic carbon density. The Pinus armandii plantation soil organic carbon has obvious phenomenon of surface aggregation, reduce human unnecessary interference, to a certain extent, help the soil to fix more carbon.