帽儿山5种林型土壤碳氮磷化学计量关系的垂直变化  

Vertical variation in stoichiometric relationships of soil carbon,nitrogen and phosphorus in five forest types in the Maoershan region,Northeast China

作　　者：张泰东 王传宽[1] 张全智[1] ZHANG Tai-dong WANG Chuan-kuan ZHANG Quan-zhi(Center for Ecological Research, Northeast Forestry University, Harbin 150040, China）.)

机构地区：[1]东北林业大学生态研究中心,哈尔滨150040

出　　处：《应用生态学报》2017年第10期3135-3143,共9页Chinese Journal of Applied Ecology

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~~

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.Five forests under diverse site conditions but under identical climate in the Maoershan region of Northeast China were sampled for measuring contents of soil carbon（ C）,nitrogen（ N）,and phosphorus（ P）,soil bulk density,and soil thickness by soil profile horizons. The stands included two plantations（ i.e.,Pinus koraiensis and Larix gmelinii plantations） and three broadleaved forests（ i. e.,Quercus mongolica stand,Populus davidiana-Betula platyphylla mixed stand,and hardwood stand）. Our aim was to examine vertical distribution of the content,density,and stoichiometry of soil C,N and P for the five forest types. The results showed that the contents and densities of soil C,N and P differed significantly among the forest types,with the maxima of the soil C and N at both O-and A-horizons occurring in the hardwood stand. The contents of C and N decreased significantly with increasing soil depth in all the stands. P content decreased significantly only in the broadleaved stands,and P content had no significant difference among different soil layers in the coniferous stands. The soil C/N at the A-horizon,N/P at the O-horizon,and the C/P at A-and Bhorizons were significantly different among the forest types. The soil C and N linearly correlated significantly across all the forest types without significant differences in the slopes and intercepts,and the soil N and P,or the soil C and P correlated significantly only in the broadleaved stands. This result suggested that the C-N coupling relationship tended to converge across the forest types,and the N-P and C-P relationships varied with forest types.

关 键 词：温带森林 土壤发生层 生物地球化学 

分 类 号：S714.2[农业科学—林学]