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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.
Two soil layers of coniferous forests (Pinus koraiensis and Larix gmelinii forest) and three natural deciduous broad-leaved forests (Quercus mongolica Forests) under the same climatic conditions in Maoershan area were determined by soil stratified sampling method. , Populus euphratica forest and hard broad-leaved forest), soil nitrogen (C) content, phosphorus (P) content, soil bulk density and soil thickness were studied to study the relationship between C, N, P content and density and stoichiometry The results showed that the content and density of soil C, N, P in different types of forest were significantly different, in which the C and N contents and densities of layer O and layer A in hardwood forest were significantly higher than those in other forest types The content of C and N in forest soil decreased with the deepening of soil depth. The content of P in deciduous broad-leaved forest decreased significantly with the deepening of soil layer, but there was no significant difference in P content among different soil layers. Soil C / N, soil O / N and soil C / P in soil layers A and B. Soil CN in different forest types had a significant linear relationship, and the slope and intercept differed between different forest types However, the relationship between NP and CP in soil was only significant in broad-leaved forest, which indicated that between different forest types Soil with a C-N coupling relationship Convergence, the Soil N-P, and C-P relationship with the forest type and the variant.