丹江流域浮游植物群落的时空变化及驱动因子
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摘要：
浮游植物是水域生态系统中的重要指示物种，其群落的组成和分布与环境因子密切相关。丹江是丹江口水库的主要水源，研究丹江流域浮游植物的时空变化特征以及驱动因子，对丹江流域水资源保护十分重要。研究采集了2个时期（枯水期和丰水期）丹江干流和6条支流的水样及浮游植物样品，通过对浮游植物的鉴定及分析，明确不同时间和空间浮游植物群落结构对环境因子的响应。研究鉴定出丹江流域浮游植物7门62属104种，主要以硅藻门（Bacillariophyta）为主。枯水期和丰水期丹江流域优势藻均为曲壳藻（Achnanthes）。前20优势藻中11种为硅藻门。丹江流域水温（WT）与多样性指数显著相关，且在枯水期更显著。丹江流域枯水期浮游植物群落结构变化的主要影响因子为总氮（TN），丰水期浮游植物群落结构变化的主要影响因子为WT、pH、溶解氧（DO）和TN。丹江流域浮游植物群落主要受到WT、TN和总磷（TP）环境因子的调控。丰水期网络的节点、边和模块化较枯水期更高且浮游植物之间主要呈现正相关系。上游网络分为4个模块，而下游仅分为2个模块且浮游植物之间主要呈负相关 关系。研究为丹江流域水生态的保护提供了理论依据。
Phytoplankton serves as an important indicator species in aquatic ecosystem, with its community composition and distribution closely linked to environmental factors, The Daniiang River is the primary water source for the Danjiangkou Reservoir, making it crucial to study the spatial and temporal variations of phytoplankton and their driving factors to protect the water resources of the Danjiang River Basin, In this study, water and phytoplankton samples were collected from the main stream and six tributaries of the Daniang River during both dry and wet seasons, Phytoplankton species were identified and anlayzed to understand thelr community strueture's response to enyonmental factors over time and space. In the Danjiang River Basin. 104 species of phytoplankton across 7 phyla and 62 genera were identified, with diatoms being the predominant group Achmanthes was the dominant genus during both dry and wet periods, Among the top 20 dominant algae, 11 species were diatoms, Water temperature(WT) in the Danjiang Basin showed a stronger correlation with the diversity index, especially during the dry season, In the dry season, total nitrogen(TN) was the main factor influencing phytoplankton structures changes, while in the wet season, WT, pH, dissolved oxygen(D0), and TN were the primary influencing factors, The phytoplankton community in the Danjiang Basin was mainly regulated by WT, T'N, and total phosphorus(TP), Network analysis revealed that nodes, edges, and modularity were higher during the wet season compared with the dry season, indicating stronger positive relationships among phytoplanktons, The upstream network consisted of four modules, whereas the downstream network had only two, with phytoplankton predominantly negatively correlated with each other.This study provides a theoretical basis for protecting the aquatic ecosystem of the Daniiang River Basin.
作者：
李明，叶思思，李娟，薛旭东，胡恩
LiMing，YeSisi， LiJuan，Xue Xudong，HuEn
机构地区：
西北农林科技大学资源环境学院；陕西省环境调查评估中心；陕西省环境科学研究院
引用本文：
李明，叶思思，李娟，等。丹江流域浮游植物群落的时空变化及驱动因子 [J] . 学报(自然科学版) , 2025,53(2) :1-13. (Li Ming, Ye Sisi, Li Juan, et al.Temporal and spatial changes and driving factors of phytoplankton communities in the Danjiang River Basin[J] .Journal of Henan Normal University (Natural ScienceEdi- tion) ,2025,53(2) :1-13. DOI:10. 16366/j. cnki.1000-2367. 2024. 06. 14. 0002. )
基金：
国家自然科学基金
关键词：
丹江流域；浮游植物；环境因子；多样性指数；时空变化
Daniang River Basin; phytoplankton; environmental factors ; diversity index; temporal and spatial variation
分类号：
Q948. 8
