太行山区不同林龄油松叶片-枝条-土壤生态化学计量特征  

Ecological stoichiometry in leaves,branches,and soils of Pinus tabuliformis at different stand ages in the Taihang Mountains,China

作　　者：张佳鑫 李一萱 曹建生[2] 李炜 王楠 张瑜[1,4,5] ZHANG Jiaxin;LI Yixuan;CAO Jiansheng;LI Wei;WANG Nan;ZHANG Yu(School of Geographic Scienes,Hebei Normal University,Shijiazhuang 050024,China;Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050022,China;School of Land Science and Spatial Planning,Hebei GEO University,Shjiazhuang 050031,China;Hebei Key Laboratory of Environmental Change and Ecological Construction,Shjiazhuang 050024,China;Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change,Shijiazhuang 050024,China)

机构地区：[1]河北师范大学地理科学学院,石家庄050024 [2]中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄050022 [3]河北地质大学土地科学与空间规划学院,石家庄050031 [4]河北省环境演变与生态建设重点实验室,石家庄050024 [5]河北省环境变化遥感识别技术创新中心,石家庄050024

出　　处：《应用生态学报》2024年第11期2966-2974,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(42101019,42371048);河北省教育厅科学研究项目青年拔尖人才计划项目(BJK202202);河北省自然科学基金项目(D2024205037)资助。

摘　　要：为揭示油松植物-土壤生态化学计量特征随林龄的变化规律及其内在联系,以太行山区不同林龄(10、23、39、47年生)油松人工林为研究对象,分析叶片、枝条、土壤不同土层碳(C)、氮(N)、磷(P)含量及其化学计量比的差异,探究土壤理化性质对叶片、枝条生态化学计量特征的影响。结果表明:随林龄增加,土壤C、N含量先增后减,39年生时达到最大值,P含量在47年生时达到最大值;23年生林龄土壤C∶P、N∶P显著高于其他林地,油松生长受P限制显著。随土层加深,不同林龄土壤C、N、P、C∶P、N∶P均降低,而C∶N升高,N限制作用增强。各土层土壤化学计量特征在不同林龄间差异显著,在浅层土壤(0~20 cm)最为明显。油松叶片与枝条N随林龄增加先升后降,而P变化呈相反趋势;叶片C∶P、N∶P均在23年生较高,叶片与枝条养分有趋同效应。土壤C与叶片N,土壤C∶N与枝条C∶N均呈显著正相关,且深层土壤(20~60 cm)相关性大于浅层土壤。土壤砂粒含量与N∶P是影响叶片养分的关键因子,土壤P、C含量是影响枝条养分的主控因子,土壤含水量、土壤N、C∶N共同调控叶片与枝条养分变化。与浅层土壤相比,深层土壤N对叶片、枝条养分制约更明显,而土壤含水量影响较小。油松林土壤C∶N(17.0)高于全国平均水平,叶片N∶P(8.2)与枝条N∶P(8.3)均低于14,表明随年限增长N制约加剧。建议在油松林发育中、后期补充P肥和N肥,保证人工林正常发育,并促进植物与土壤的良性养分循环。To understand the changes and relationship of plant-soil eco-stoichiometric characteristics of Pinus tabuliformis plantations with stand ages,we investigated P.tabuliformis plantations of different stand ages(10,23,39,and 47 years old)in the Taihang Mountains.We measured the concentration and stoichiometry of carbon(C),nitrogen(N),and phosphorus(P)in leaves,branches,and soils at different layers.We analyzed the relationship between leaf,branch nutrient characteristics and soil physicochemical properties.The results showed that soil C and N contents decreased after an initial increase with increasing stand ages,being the maximum at the 39 years old stand,while P content was the maximum at 47 years old stand.Soil C:P and N:P of the 23 years old stand were significantly higher than that of other stand ages,indicating that P was the limiting factor for P.tabuliformis growth.With increasing soil depth,the concentration of C,N,P,C:P and N:P in soils of different stand ages decreased,while the C:N increased,suggesting an enhanced N limitation.The stoichiometric characteristics of soils at different depths varied significantly among different stand ages,particularly in the upper soil layers(0-20 cm).The N content in leaves and branches increased first and then decreased,while the P content decreased first and then increased.The C:P and N:P in leaves and branches were higher at 23 years old,indicating a synergistic effect of nutrient acquisition between leaves and branches.Soil C concentration was significantly positively correlated with leaf N,while soil C:N was significantly positively correlated with branch C:N.There was a stronger correlation in the deeper soil layers(20-60 cm)than the upper soil layers.Soil sand content and N:P were key factors influencing nutrients in leaves,while soil P and C contents were the main factors influencing nutrients in branches.Soil water content(SWC),soil N content,and soil C:N jointly regulated nutrient variations in leaves and branches.Compared to the upper soil layers,the deeper soi

关 键 词：化学计量 林龄 油松人工林 土壤理化性质 土壤深度 

分 类 号：S791.254[农业科学—林木遗传育种]