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Tree allometry responses to competition and complementarity in mixed-species plantations of Betula alnoides
Forest Ecosystems ( IF 3.8 ) Pub Date : 2024-05-29 , DOI: 10.1016/j.fecs.2024.100207 Boyao Chen , Kaili Liu , Chunsheng Wang , Junjie Guo , Junkun Lu , Lin Chen , Zhigang Zhao , Jie Zeng
Forest Ecosystems ( IF 3.8 ) Pub Date : 2024-05-29 , DOI: 10.1016/j.fecs.2024.100207 Boyao Chen , Kaili Liu , Chunsheng Wang , Junjie Guo , Junkun Lu , Lin Chen , Zhigang Zhao , Jie Zeng
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 interspecific competition and complementarity remain poorly understood. Taking into consideration strong- and weak-space competition (SC and WC), as well as N-fixing and non-N-fixing tree species (FN and nFN), a mixed-species planting trial was conducted for , a pioneer tree species, which was separately mixed with (SC + FN), (WC + FN), (SC + nFN) and var. (WC + nFN) in southern China. Six years after planting, tree growth, total nitrogen (N) and carbon (C) contents, and the natural abundances of N and C in the leaves were measured for each species, and the mycorrhizal colonisation rates of were investigated under each treatment. Allometric variations 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 in mixtures with FN or nFN. The tree height growth of 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 was significantly influenced by both space competition and N 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 efficiency (WUE) of , and its N use efficiency (NUE) was much lower in the FN mixtures. Structural equation modeling further demonstrated that the stem allometry of 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.
更新日期：2024-05-29
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