摘要
以秦岭典型林地土壤为对象,分析了夏、秋两季锐齿栎、油松、华山松、云杉4种典型林分下林地不同土层土壤的生态化学计量学特征。结果表明：5个林地腐殖质层（O层）、表层（A层）土壤有机碳含量分别在76.23-260.70,26.60-44.81g/kg之间;全氮含量在4.19-8.76,1.46-3.29g/kg之间;全磷含量分别在0.38-0.61,0.33-0.63g/kg之间。5个林地O层、A层C/N范围分别为16.48-29.76,12.31-19.39;C/P范围分别为144.93-465.52,44.63-107.42;N/P范围分别为7.97-18.37,2.58-6.23。土壤有机碳和全氮及C/N,C/P,N/P均表现为O层大于A层,且O层碳氮含量动态变化较大。阔叶林地土层间差异小于针叶林地。华山松林地土壤碳氮磷含量及C/N、C/P均高于其他林地。土壤C/P和N/P的空间变异性较大,C/N相对稳定。土壤碳氮磷含量及化学计量比值大多表现为夏季高于秋季。
Qingling typical forest lands were chosen as the research subjects to analyze the characteristics of ecological stoichiometry in different soil layers in the forest lands of 4 typical forest stands （tooth oak, chinese pine, armand pine, and spruce） in summer and autumn. The results showed that the contents of C in humus layer （O） and in topsoil （A） of 5 forest lands were 76.23 g/kg to 260.70 g/kg and 26.60 g/kg to 44.81 g/kg, respectively. The contents of N in humus layer and in topsoil were 4.19 g/kg to 8.76 g/kg and 1.46 g/kg to 3.29 g/kg, respectively. The contents of P in humus layer and in topsoil were 0.38 g/kg to 0.61 g/kg and 0.33 g/kg to 0.63 g/kg, respectively. The ratios of C/N were 16.48 to 29.76 in O layer and 12.31 to 19.39 in A layer. The ratios of C/P were 144.93 to 465.52 in O layer and 44.63 to 107.42 in A layer. The ratios of N/P were 7.97 to 18.37 in O layer and 2.58 to 6.23 in A layer. The soil organic C and total N contents, and the stoichiometry ratios （C/N, C/P, N/P） in O layer were higher than those in A layer, with more significant variations of C and N contents in O layer. The differences between soil layers in broad--leaved forest land were smaller than those in coniferous forest land. The C, N and P contents and the ratios of C/N and C/P in China Armand pine forest land were higher than those in other forest lands. The ratios of C/P and N/P had more significant spatial variation, but the ratio of C/N was relatively stable. The C, N and P nutrients and stoichiometry ratios in the soils in summer were usually higher than those in autumn.
出处
《水土保持学报》
CSCD
北大核心
2016年第4期194-198,248,共6页
Journal of Soil and Water Conservation
基金
国家林业公益性行业科研专项(201304307)
国家自然科学基金项目(41571245)
西北农林科技大学基本科研业务费科研创新重点项目(ZD2013012)
关键词
秦岭
生态化学计量学
腐殖质层
表土层
Qinling Mountain
ecological stoichiometry
humus layer
topsoil
