土壤碳氮磷生态化学计量比对针阔人工混交林及其纯林的差异响应  

Differential Responses of Soil Carbon,Nitrogen and PhosphorusEco-stoichiometric Ratio to Monoculture andMixed Coniferous-Broadleaved Plantations

作　　者：肖指柔 滕金倩 秦佳琪 梁泽丽 何江 覃林[1] XIAO Zhirou;TENG Jinqian;QIN Jiaqi;LIANG Zeli;HE Jiang;QIN Lin(Guangxi Key Laboratory of Forest Ecology and Conservation,Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation,College of Forestry,Guangxi University,Nanning Guangxi 530004,P.R.China)

机构地区：[1]广西大学林学院,广西森林生态与保育重点实验室/广西高校亚热带人工林培育与利用重点实验室,广西南宁530004

出　　处：《西部林业科学》2024年第2期56-63,共8页Journal of West China Forestry Science

基　　金：国家自然科学基金项目(31560109)。

摘　　要：为了阐明针阔人工混交林及其纯林对土壤碳(C)、氮(N)、磷(P)生态化学计量比的影响,以我国南亚热带地区针叶马尾松、阔叶格木人工纯林及二者的混交林为研究对象,依据各林分土壤表层(0~20 cm)、中层(20~40 cm)和底层(40~60 cm)土壤碳氮比(C/N)、碳磷比(C/P)和氮磷比(N/P),利用方差分析检验土壤C/N、C/P、N/P在不同林分不同土层间的差异特征,进而采用直线回归分析法探究C/N、C/P、N/P与土壤理化性质因子的相关关系。结果显示:(1)土壤C、N、P生态化学计量比在不同林分间的差异依土层而异。土壤C/N在各土层的林分间无显著差异(P>0.05),而马尾松-格木混交林土壤表层的C/P显著高于马尾松林(P<0.05),土壤N/P在格木林和混交林表层和底层均显著高于马尾松林。(2)随土壤深度增加土壤C、N、P生态化学计量比变化趋势依林分而异。马尾松林土壤C/N在土壤表层显著高于中层和底层(P<0.05),而其C/P则是土壤中层显著高于表层和底层;马尾松林和混交林的土壤N/P均随土壤深度增加而降低。(3)研究区样地林分土壤C/N、C/P与SOC显著正相关(P<0.05),而土壤N/P与TN极显著正相关(P<0.01)。研究结果表明,在南亚热带地区营建格木林及马尾松-格木混交林对平衡土壤碳氮磷养分的效果优于马尾松纯林。In order to elucidate the effects of mixed coniferous broad-leaved and monoculture plantations on soil carbon(C),nitrogen(N),phosphorus(P)ecological stoichiometric ratios,coniferous tree species Pinus massoniana,broad-leaved tree Erythrophleum fordii,and their mixed plantations in south subtropical regions of China were selected as the research objects.According to soil carbon,nitrogen ratio(C/N),carbon,phosphorus ratio(C/P)and nitrogen,phosphorus ratio(N/P)in topsoil(0-20 cm),middle layer(20-40 cm)and subsoil(40-60 cm)of each stand.Used variance analysis to examine the differences of soil C/N,C/P and N/P in different stands and soil layers.The results showed that(1)The difference of soil ecological stoichiometry ratio of C,N and P in different stands varied according to soil layer.Soil C/N had no significant difference between three stands(P>0.05),and the topsoil C/P of P.massoniana-E.fordii mixed plantations was significantly higher than that of P.massoniana(P<0.05).Soil N/P was significantly higher in the topsoil and subsoil of E.fordii and mixed plantations than that in P.massoniana.(2)The trend of soil C,N and P ecological stoichiometric ratios with increasing soil depth varied according to the stand types.Soil C/N in the P.massoniana topsoil was significantly higher than middle layer and subsoil(P<0.05),but soil C/P in middle layer in was significantly higher than that of the topsoil and subsoil.Soil N/P of P.massoniana and mixed forest decreased with increasing soil depth.(3)Study plantations soil C/N and C/P were significantly positively correlated with SOC(P<0.05),and soil N/P was significantly positively correlated with TN(P<0.01).In conclusion,construction of E.fordii and mixed P.massoniana and E.fordii plantations has more obvious effects on the balance of C,N and P nutrients than that of P.massoniana in the subtropical China.

关 键 词：针阔人工混交林 人工纯林 碳 氮 磷 生态化学计量比 

分 类 号：S714[农业科学—林学]