生态学杂志2025，Vol.44Issue(4)：1085-1096,12.DOI:10.13292/j.1000-4890.202504.022
大兴安岭不同演替阶段天然林不对称性竞争
Asymmetric competition in natural forests at different successional stages in the Daxing'an Mountains,China
摘要
Abstract
Asymmetric competition plays a crucial role in the spatial distribution of populations,community struc-ture transitions,and stable forest succession.Based on survey data from fixed 1-hm2 plots in each of three different succession stages(Betula platyphylla forest,B.platyphylla-L.gmelinii mixed forest,and Larix gmelinii forest)in Daxing'an Mountains,we quantified the spatial distribution and competition asymmetry of different tree species(Betula platphylla and Larix gmelinii)and different size classes(saplings,medium trees,and large trees)using univariate and bivariate pair-correlation functions g(r)and univariate and bivariate mark variogram γ(r).The re-sults showed that dominant tree species exhibited significant aggregated distribution at multiple scales.Symmetric competition was mainly found within species.Significant asymmetric competition was only found at the 0-1 m scale in the Betula forest.In the mixed forest,there was a significant symmetric competition between Betula and Larix at the 2-3 m scale,with spatial negative correlation at the 0-3 m scale.As tree size increased,the spatial distribution patterns of trees in each successional stage showed a transition from clustered distribution in saplings to random dis-tribution in large trees.In Betula forest,individuals of the same and different classes mainly exhibited symmetric competition,with asymmetric competition only found between medium and large trees at the 10-12 m scale.The spatial correlation between size classes was mainly negative and uncorrelated.In the mixed Betula-Larix forest,on-ly saplings showed significant asymmetric competition at the 10 m and 20 m scales.Large trees exhibited significant symmetric competition with medium and sapling trees,with positive spatial correlations between size classes.In Larix forest,individuals within and among different classes primarily engaged in symmetric competition,with signif-icant asymmetric competition between saplings and large trees at multiple scales,and the spatial correlations be-tween classes were mainly unrelated.Svmmetric competition within the same species and size classes was an impor-tant factor influencing the spatial distribution patterns of trees in natural forest communities at different successional stages.关键词
大兴安岭/对称性竞争/不对称性竞争/标记变异函数/天然林Key words
Daxing'an Mountains/symmetric competition/asymmetric competition/mark variogram/natural forest引用本文复制引用
肖云友,董灵波..大兴安岭不同演替阶段天然林不对称性竞争[J].生态学杂志,2025,44(4):1085-1096,12.基金项目
十四五国家重点研发计划(2023YFF1304002)资助. （2023YFF1304002）
