摘要
【目的】分析江西武夷山南方铁杉林主要树种叶片养分含量,阐明不同生活型(落叶树种和常绿树种)树种新鲜叶和凋落叶养分化学计量特征与养分再吸收效率,为揭示南方铁杉林主要树种叶片养分含量及再吸收效率对植物生活型的响应机制提供理论依据。【方法】采集南方铁杉天然林内主要树种的新鲜叶和凋落叶,测定叶片碳(C)、氮(N)、磷(P)含量,计算其化学计量比和养分再吸收效率,采用标准化主轴回归估计方法对南方铁杉林主要树种新鲜叶与凋落叶中N、P含量的异速生长关系进行研究,分析生活型对叶片N、P含量之间关系的影响。【结果】1)南方铁杉天然混交林中,落叶和常绿两生活型树种间的新鲜叶C含量无显著差异,但落叶树种N和P含量均显著高于常绿树种(P<0.05);但两生活型树种间的凋落叶C、N、P含量均无显著差异。2)新鲜叶C∶N和C∶P均表现为落叶树种显著低于常绿树种(P<0.05),但N∶P在两生活型树种间差异不明显;凋落叶C∶N、N∶P和C∶P均显著大于新鲜叶,但其在两生活型树种间差异不明显。3)常绿树种新鲜叶N与P含量间存在显著正相关关系;常绿树种与落叶树种凋落叶N与P含量显著正相关(P<0.05),但斜率差异不显著(P=0.60),斜率为0.73;凋落叶N含量与新鲜叶N含量显著正相关(P<0.05),但凋落叶P含量与新鲜叶P含量无显著相关性。4)落叶树种与常绿树种间叶片N、P再吸收效率差异不明显,二者均有较高的P再吸收效率。【结论】落叶树种新鲜叶N、P含量显著高于常绿树种,两生活型树种间的N、P再吸收效率无显著差异。生活型对凋落叶N和P含量相关关系斜率未产生影响;不同生活型树种叶片养分含量存在显著差异;不同生活型树种具有不同的养分获取策略。
【Objective】Contents of leaf nutrients of the main tree species in Tsuga chinensis forest were investigated to illustrate stoichiometric characteristics and resorption efficiency of nutrients of fresh and litter leaves of tree species with different life forms(deciduous and evergreen tree species),in order to reveal their responses to the different life forms.【Method】The fresh and litter leaves of main tree species were collected in T.chinensis natural forest.The contents of carbon(C),nitrogen(N)and phosphorus(P)in leaves were determined,and their stoichiometric ratio and nutrient resorption efficiency were calculated.The standardized major axis estimation(SMA)method was used to study the allometric relationship among the fresh leaves of the main tree species in the T.chinensis forest.The effects of different life forms on the relationship between N and P contents in leaves were analyzed.【Result】There was no significant difference in fresh leaf C content between deciduous and evergreen tree species,but the N,and P content of deciduous tree species was significantly higher than that of evergreen tree species(P<0.05).there was no significant difference in the contents of C,N and P in litter leaves between the two life-forms in the natural mixed forest of T.chinensis in Wuyi Mountain.the C∶N and C∶P of fresh leaves in deciduous species was significantly lower than that of fresh leaves in evergreen species(P<0.05),but their N:P was not different between the two life-types,C∶N,N∶P,and C∶P of litter leaves were all significantly larger than that of the fresh leaves,but there was no difference between the two different life forms.There was a significant positive correlation between the N and P contents in the fresh leaves of evergreen tree species and a significant positive correlation of the N and P contents in the litter leaves between evergreen and deciduous tree species(P<0.05),but the slope of the correlation function was not significant(P=0.60),with a value of 0.73,and the N content of the lit
作者
武盼盼
曾利剑
雷平
胡丹丹
李锦隆
王满堂
钟全林
Wu Panpan;Zeng Lijian;Lei Ping;Hu Dandan;Li Jinlong;Wang Mantang;Zhong Quanlin(Fujian Provincial Key Laboratory of Plant Ecophysiology,Fujian Normal University,Fuzhou 350007;Administrative Bureau of Jiangxi Wuyishan National Nature Reserve,Shangrao 334500;Institute of Geography,Fujian Normal University,Fuzhou 350007;School of City and Civil Engineering,Zaozhuang University,Zaozhuang 277160)
出处
《林业科学》
EI
CAS
CSCD
北大核心
2022年第1期12-21,共10页
Scientia Silvae Sinicae
基金
国家自然科学基金项目(32071555,31971643,32001094)
福建省教育厅项目(JAT190084)。
关键词
碳
氮
磷
亚热带森林
南方铁杉
主要树种
养分再吸收效率
carbon
nitrogen
phosphorus
subtropical forest
Tsuga Chinensis
major tree species
nutrient resorption efficiency
