丹江流域干支流浮游细菌群落结构特征与驱动因子
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摘要：
浮游细菌是河流生态系统中元素循环和能量流动的主要贡献者，其群落组成和多样性因其地理位置而异。干流和支流通常在水文、地形和人类活动强度方面存在差异，目前对干流和支流之间浮游细菌群落组成的差异比较及其构建机制尚不明确。通过采集丹江流域干流和支流19个样点的浮游细菌样本，进行16SrRNA基因测序和水质分析，确定了丹江流域干流和支流浮游细菌的基本分布格局及其关键环境因子。结果表明，丹江流域浮游细菌主要以变形菌门、放线菌门、拟杆菌门和蓝细菌门为主。丹江支流浮游细菌的α多样性高于干流，并且干流和支流浮游细菌在β多样性组成上存在显著差异。干流浮游细菌群落组成主要受到TOC（总有机碳）和DO（溶解氧）的影响，而支流浮游细菌则主要受TN(总氮)、NO3-N(硝态氮)和T(水温)的影响。此外，中性群落模型表明丹江干流浮游细菌主要受到确定性过程的影响，而支流主要受到随机性过程的影响。
Bacterioplankton are major contributors to elemental cycling and energy flow in riverine ecosystems, and their community composition and diversity vary by geographic location, Variations in hydrology, topography, and human activity intensity between mainstreams and tributaries cause different responses of bacterioplankton communities, However, the differences in bacterioplankton community composition and diversity between mainstems and tributaries, as well as their driving factors, are unclear. In this study, we collected bacterioplankton samples from 19 sites in the mainstem and tributaries of the Danjiang River Basin, We identified the basic distribution patterns of bacterioplankton and their key environmental factors in the Danjiang River Basin by using 16S rRNA gene sequencing and water quality analysis. The results showed that planktonic bacteria in the Daniang River Basin were mainly dominated by Proteobacteria, Bacteroidota, Actinobacteriota and Cyanobacteria.The a-diversity of bacterioplankton was higher in the tributaries compared with that in the mainstem, with a significant difference observed in β-diversity composition between them, Planktonic bacteria in the mainstem were primarily influenced by TOC(total organic carbon) and DO(dissolved oxygen), while those found in tributaries were mainly affected by TN(total nitrogen).NO3--N(nitrate nitrogen), and T( water temperature). Additionally, neutral community modeling indicated that planktonic bacteria communities within the mainstem of the Daniiang River were primarily infuenced by deterministic processes whereas those within tributaries were mainly influenced by stochastic processes, This study emphasizes the key role of drainage structure in shaping bacterioplankton communities.
作者：
李娟，薛旭东，杜豆，常朝
Li Juan，Xue Xudong，Du Dou，Chang Chao
机构地区：
陕西省环境调查评估中心；西北农林科技大学资源环境学院
引用本文：
李娟，薛旭东，杜豆，等。丹江流域干支流浮游细菌群落结构特征与驱动因子[J] . 学报（自然科学版）,2025, 53(2) : 14-23. (Li Juan, Xue Xudong, Du Dou, et al.Characterization and driving factors of bacterio-plankton community structure in the mainstream and tributaries of the Danjiang River Basin [J] .Journal of Henan Normal University(Natural Science Edition) ,2025,53(2) :14-23.DOI:10. 16366/j. cnki.1000-2367.2024.03.21.0001. )
基金：
国家自然科学基金
关键词：
丹江流域；浮游细菌；群落构建；生物地理学；驱动因子
Danjiang River Basin; bacterioplankton; community assembly; biogeography; driving factors
分类号：
Q89
