亚热带常绿阔叶林62种木本植物凋落叶碳氮磷化学计量特征  

C,N,and P stoichiometry for leaf litter of 62 woody species in a subtropical evergreen broadleaved forest

作　　者：李澳归 蔡世锋 罗素珍 王小红[1,2] 曹丽荣 王雪 林成芳 陈光水[1,2] LI Aogui;CAI Shifeng;LUO Suzhen;WANG Xiaohong;CAO Lirong;WANG Xue;LIN Cheng-fang;CHEN Guangshui(School of Geographical Sciences,Fujian Normal University/Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology,Fuzhou 350007,China;Sanming Forest Ecosystem and Global Change National Observation and Research Station of Fujian Province,Sanming 365000,Fujian,China;Youxi State-owned Forest Farm of Fujian Province,Youxi 365100,Fujian,China)

机构地区：[1]福建师范大学地理科学学院/湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建三明森林生态系统与全球变化国家野外科学观测研究站,福建三明365000 [3]福建省尤溪国有林场,福建尤溪365100

出　　处：《应用生态学报》2023年第5期1153-1160,共8页Chinese Journal of Applied Ecology

基　　金：福建省科技厅对外合作项目(2021I0011);国家自然科学基金项目(31770663)资助。

摘　　要：为揭示亚热带常绿阔叶林凋落叶碳(C)、氮(N)和磷(P)化学计量特征,本研究测定了福建省三明格氏栲自然保护区天然林内62种主要木本植物凋落叶C、N和P含量,分析叶习性(常绿、落叶)、生活型(乔木、小乔木或灌木)以及主要科之间凋落叶化学计量的差异,通过Blomberg’s K衡量系统发育信号,分析了科水平分化时间与凋落叶化学计量之间的相关性。结果表明:62种木本植物凋落物C、N、P含量分别为405.97~512.16、4.45~27.11和0.21~2.53 g·kg^(-1),C/N、C/P和N/P分别为18.6~106.2、195.9~2146.8和3.5~68.9。常绿树种凋落叶P含量显著低于落叶树种,C/P和N/P显著高于落叶树种,二者之间的C、N含量和C/N无显著差异;乔木与小乔木或灌木之间的化学计量均无显著性差异。系统发育对凋落叶C、N含量和C/N有显著影响,对P含量、C/P和N/P无显著影响。科水平分化时间与N含量呈显著负相关,与C/N呈显著正相关。壳斗科凋落叶倾向于高C、N含量、C/P和N/P,低P含量和C/N;无患子科则表现出相反的趋势。与全球尺度相比,亚热带地区凋落物具有高C、N含量和N/P,以及低P含量、C/N和C/P的特征;受系统发育的影响,进化较古老的树种凋落叶具有较低的N含量和较高的C/N;凋落叶之间的化学计量差异不受生活型的影响;不同叶习性树种之间的P含量、C/P和N/P差异显著,但整体表现出一定的趋同效应。To understand leaf litter stoichiometry in a subtropical evergreen broadleaved forest,we measured the contents of carbon(C),nitrogen(N)and phosphorus(P)in leaf litters of 62 main woody species in a natural for⁃est of C.kawakamii Nature Reserve in Sanming,Fujian Province.Differences in leaf litter stoichiometry were ana⁃lyzed across leaf forms(evergreen,deciduous),life forms(tree,semi⁃tree or shrub),and main families.Additionally,the phylogenetic signal was measured by Blomberg’s K to explore the correlation between family level differentiation time and litter stoichiometry.Our results showed that the contents of C,N and P in the litter of 62 woody species were 405.97-512.16,4.45-27.11,and 0.21-2.53 g·kg^(-1),respectively.C/N,C/P and N/P were 18.6-106.2,195.9-2146.8,and 3.5-68.9,respectively.Leaf litter P content of evergreen tree species was signifi⁃cantly lower than that of deciduous tree species,and C/P and N/P of evergreen tree species were significantly higher than those of deciduous tree species.There was no significant difference in C,N content and C/N between the two leaf forms.There was no significant difference in litter stoichiometry among trees,semi⁃trees and shrubs.Effects of phylogeny on C,N content and C/N in leaf litter was significant,but not on P content,C/P and N/P.Family differentiation time was negatively correlated with leaf litter N content,and positively correlated with C/N.Leaf litter of Fagaceae had high C and N contents,C/P and N/P,and low P content and C/N,with an opposite trend for Sapidaceae.Our findings indicated that litter in subtropical forest had high C,N content and N/P,but low P content,C/N,and C/P,compared with the global scale average value.Litter of tree species in older sequence of evolutionary development had lower N content but higher C/N.There was no difference of leaf litter stoichiometry among life forms.There were significant differences in P content,C/P,and N/P between different leaf forms,with a characteristic of convergence.

关 键 词：亚热带森林 木本植物 凋落叶 化学计量 系统发育 

分 类 号：S718.5[农业科学—林学]