摘要
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。
The soil organic carbon content and organic carbon density and the main factors affecting the organic carbon density of Pinus armandii plantation were studied to provide the basis for the scientific assessment of carbon sequestration capacity of Pinus armandii plantation. Sample plots were set up in the forest in the middle age,nearly mature forest and mature forests of Pinus armandii plantation in Mopan mountain which is in Yuxi,Yunnan Province. The sample plots information was recorded and soil samples of 0- 60 cm soil layer were took. The soil organic carbon content and density were quantified on laboratory. Principal component analysis was used to assess the factors of vegetation,topographic and soil physical and chemical within 3 forests. The organic carbon contents in the middle aged of Pinus armandii plantation,nearly mature of Pinus armandii plantation and mature forest of Pinus armandii plantation were 28. 76g·kg^-1,25. 70g·kg^-1,and 25. 61g·kg^-1respectively,and the carbon densities were 128. 87t·hm^-2,124. 34t·hm^-2and 117. 49t·hm^-2,respectively. Both the soil organic carbon content and density decreased gradually with the deepening of the soil in all the 3 forests. Principal component analysis indicated that the average diameter of trees,average tree height,elevation,carbon nitrogen ratio and total nitrogen content were the main factors affecting the soil organic carbon density. Soil organic carbon accumulated obviously on the soil surface. Reducing unnecessary human disturbance to some extent was favorable for more carbon fixed in soil.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第8期110-114,共5页
Journal of Arid Land Resources and Environment
基金
国家林业局林业公益性行业科研专项(201204101-10)资助
关键词
华山松人工林
土壤碳密度
主成分分析
Pinus armandii plantation
soil organic carbon content
principal component analysis
