生态学报2026，Vol.46Issue(6)：2830-2845,16.DOI:10.20103/j.stxb.202505301347
华北落叶松人工林土壤细菌群落纬度分布特征及其影响因素
The latitudinal distribution characteristics of soil bacterial communities in Larix gmelinii var.principis-rupprechtii plantations and the influencing factors
摘要
Abstract
To elucidate the spatial distribution patterns and environmental drivers of soil bacterial communities in Larix gmelinii var.principis-rupprechtii plantations across different latitudinal gradients,eight representative plantation sites spanning the species' main distribution range were selected.Soil bacterial community composition was characterized using high-throughput sequencing technology.The patterns of community structure and diversity along the latitudinal gradient were analyzed via one-way ANOVA,Pearson correlation analysis,and redundancy analysis(RDA)so as to provide a scientific basis for rational management of forest ecosystems and soil quality.The results showed that:(1)Proteobacteria,Acidobacteriota,and Actinobacteriota were the dominant bacterial phyla.At the genus level,Candidatus_Udaeobacter and RB41 were widely distributed dominant taxa,whereas Delftia was identified as a site-specific dominant genus in the Taibai plot.(2)The relative abundances of Proteobacteria and Methylomirabilota significantly decreased with increasing latitude,whereas Actinobacteriota and Verrucomicrobiota showed significant increasing trends(P＜0.05).Alpha diversity of soil bacteria did not vary significantly along the latitudinal gradient(P＞0.05),whereas Beta diversity differed significantly among latitudinal zones(P＜0.01),showing an overall fluctuating pattern characterized by an initial increase,followed by a decrease,a subsequent increase,and a slight decline.(3)Microbial biomass carbon(MBC)and microbial biomass nitrogen(MBN)contents did not show significant variation along the latitudinal gradient.(4)Soil bacterial community structure was significantly influenced by soil bulk density,soil mass moisture content,mean annual precipitation,MBC,MBN,soil readily available potassium,and canopy closure(P＜0.05).Alpha diversity indices were primarily affected by canopy closure,elevation,MBC,and cation exchange capacity(CEC)(P＜0.05).The relative abundances of major bacterial phyla exhibited distinct trends across the latitudinal gradient,whereas Alpha diversity,MBC,and MBN showed no significant latitudinal patterns.Overall,soil bulk density,soil mass moisture content,mean annual precipitation,MBC,MBN,clay content,CEC,elevation,slope,and canopy closure were identified as key environmental factors shaping the spatial distribution of bacterial communities,and serve as important drivers of their variation along the latitudinal gradient.These findings provide a theoretical support for a deeper understanding of the responses of soil bacterial community structure and diversity to latitudinal changes in L.gmelinii var.principis-rupprechtii plantations.关键词
土壤微生物/纬度梯度/华北落叶松人工林/环境因子Key words
soil microorganism/latitudinal gradient/Larix gmelinii var.principis-rupprechtii plantation/environmental factor引用本文复制引用
卢佞,高文强,王海燕,杨跃辉,刘雨薇,郭初泠,张亦凡,张广月..华北落叶松人工林土壤细菌群落纬度分布特征及其影响因素[J].生态学报,2026,46(6):2830-2845,16.基金项目
"十四五"重点研发项目课题(2022YFD2200501) （2022YFD2200501）
