Tree allometry responses to competition and complementarity in mixed-species plantations of Betula alnoides

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外文摘要：Tree allometry plays a crucial role in tree survival,stability,and timber quantity and quality of mixed-species plantations.However,the responses of tree allometry to resource utilisation within the framework of interspe-cific competition and complementarity remain poorly understood.Taking into consideration strong-and weak-space competition(SC and WC),as well as N2-fixing and non-N2-fixing tree species(FN and nFN),a mixed-species planting trial was conducted for Betula alnoides,a pioneer tree species,which was separately mixed with Acacia melanoxylon(SC+FN),Erythrophleum fordii(WC+FN),Eucalyptus cloeziana(SC+nFN)and Pinus kesiya var.langbianensis(WC+nFN)in southern China.Six years after planting,tree growth,total nitrogen(N)and carbon(C)contents,and the natural abundances of 15N and 13C in the leaves were measured for each species,and the mycorrhizal colonisation rates of B.alnoides were investigated under each treatment.Allometric varia-tions and their relationships with space competition and nutrient-related factors were analyzed.The results showed a consistent effect of space competition on the height-diameter relationship of B.alnoides in mixtures with FN or nFN.The tree height growth of B.alnoides was significantly promoted under high space competition,and growth in diameter at breast height(DBH),tree height and crown size were all expedited in mixtures with FN.The symbiotic relationship between ectomycorrhizal fungi and B.alnoides was significantly influenced by both space competition and N2 fixation by the accompanying tree species,whereas such significant effects were absent for arbuscular mycorrhizal fungi.Furthermore,high space competition significantly decreased the water use effi-ciency(WUE)of B.alnoides,and its N use efficiency(NUE)was much lower in the FN mixtures.Structural equation modeling further demonstrated that the stem allometry of B.alnoides was affected by its NUE and WUE via changes in its height growth,and crown allometry was influenced by the mycorrhizal symbiotic relationship.Our findings provide new insights into the mechanisms driving tree allometric responses to above-and below-ground resource competition and complementarity in mixed-species plantations,which are instructive for the establishment of mixed-species plantations.

外文关键词：

Allometric relationshipResources competition and complementarityMixed-species forestTree-fungal symbiotic relationshipN2-fixing tree speciesResource utilisation strategies

作者：

Boyao Chen、Kaili Liu、Chunsheng Wang、Junjie Guo、Junkun Lu、Lin Chen、Zhigang Zhao、Jie Zeng

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作者单位：

Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou,510520,China

Nanjing Forestry University,Nanjing,210037,China

Central South University of Forestry & Technology,Changsha,410004,China

Experimental Center of Tropical Forestry,Chinese Academy of Forestry,Pingxiang,532600,China

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基金：

National Natural Science Foundation of ChinaNational Nonprofit Institute Research Grant of Chinese Academy of Forestry,China

项目编号：

31972949CAFYBB2023MB006

出版年：

2024

DOI：

10.1016/j.fecs.2024.100207

森林生态系统(英文版)

北京林业大学

森林生态系统(英文版)

CSTPCD

影响因子：0.09

ISSN：2095-6355

年,卷(期)：2024.11(4)