帽儿山5种林型土壤碳氮磷化学计量关系的垂直变化

发布时间：2018-02-11 14:10

本文关键词： 温带森林土壤发生层生物地球化学　出处：《应用生态学报》2017年10期 　论文类型：期刊论文

【摘要】：采用土壤分层取样法测定了帽儿山地区相同气候条件、不同立地条件下林龄相近的2种人工针叶林(红松林和兴安落叶松林)和3种天然落叶阔叶林(蒙古栎林、杨桦林、硬阔叶林)的土壤碳(C)、氮(N)、磷(P)元素含量,以及土壤容重、土壤厚度等,研究土壤C、N、P含量和密度及化学计量关系的垂直变化特征.结果表明:不同林型间土壤C、N、P含量和密度差异显著,其中硬阔叶林土壤O层和A层的C、N含量和密度均显著高于其他林型.所有林型土壤的C、N含量均随土层加深而下降;落叶阔叶林土壤P含量随土层加深而显著下降,但针叶林各土层间P含量差异不显著.不同林型间A层土壤C/N、O层土壤N/P,以及A和B层土壤C/P均存在显著差异.不同林型间土壤C-N存在显著的线性关系,且其斜率和截距在林型间差异均不显著,但土壤N-P、C-P关系只在阔叶林中存在显著相关关系.这表明不同林型间土壤C-N耦联关系有趋同现象,而土壤N-P和C-P关系随林型而变.
[Abstract]:Two artificial coniferous forests (Pinus koraiensis and Larix gmelinii) and three natural deciduous broad-leaved forests (Mongolian oak forest and poplar birch forest) and three natural deciduous broad-leaved forests (Pinus koraiensis and Larix gmelinii) and three natural deciduous broad-leaved forests (Mongolian oak forest and poplar birch forest) were determined under the same climatic conditions and. In hard broadleaved forests, the contents of C _ (C _ (N), N _ (N) N _ (N), P _ (P)), and the bulk density and thickness of the soil, etc., The vertical variation characteristics of soil C ~ (2 +) N ~ (+) P contents and densities and stoichiometric relationships were studied. The results showed that there were significant differences in soil C ~ (2 +) N ~ (+) P contents and densities among different forest types. The contents and densities of C ~ + N in O layer and A layer of hard broad-leaved forest soil were significantly higher than those in other forest types. The contents of C ~ + N in all forest soils decreased with the deepening of soil layer, and P content in deciduous broad-leaved forest soil decreased significantly with the deepening of soil layer. But there was no significant difference in P content among different soil layers in coniferous forest. There were significant differences in N / P, C / P and C / P in C / N layer and C / P of C / N layer among different forest types, and significant linear relationship existed in soil C-N among different forest types. There was no significant difference in slope and intercept between forest types, but only in broad-leaved forests, which indicated that the soil N-P and C-P relationships between different forest types tended to converge, while the soil N-P and C-P relationships varied with forest types.
【作者单位】：东北林业大学生态研究中心;
【基金】：科技部“十三五”重点研发计划项目(2016YFD0600201) 教育部长江学者和创新团队发展计划项目(IRT_15R09) 东北林业大学本科生创新项目(201310225006)资助~~
【分类号】：S714.2

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