| 泾河流域多沙河流浮游植物群落变化特征及驱动因子 |
| 摘要点击 894 全文点击 97 投稿时间：2024-05-21 修订日期：2024-07-22 |
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| 中文关键词 泾河流域 多沙河流 浮游植物 群落特征 土地利用 结构方程模型 |
| 英文关键词 Jinghe River Basin sediment-laden river phytoplankton community characteristics land use structural equation model |
| DOI 10.13227/j.hjkx.20250607 |
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| 中文摘要 |
| 为探究泾河流域多沙河流浮游植物群落特征及其对环境因子变化的响应关系，于2021年11月（秋季）和2022年5月（春季）对泾河流域干流及8条典型支流开展系统调查.共鉴定浮游植物7门72属209种，2021年秋季（126种）低于2022年春季（179种），硅藻门和绿藻门均为两季浮游植物优势门类；2021年秋季浮游植物密度和生物量均值为89.21×104 cells·L-1和1.48 mg·L-1，2022年春季浮游植物密度和生物量均值为265.92×104 cells·L-1和4.80 mg·L-1；2022年春季浮游植物的Shannon-Wiener多样性指数和Margalef丰富度指数整体高于2021年秋季，Pielou均匀度指数无显著性季节差异.相关性分析结果表明：氮磷营养盐、化学需氧量、溶解氧和浊度是影响两季浮游植物优势种密度的主要环境因子，且大多数优势种密度与浊度呈显著负相关.变差分解和结构方程模型结果表明：水体理化参数对两季浮游植物密度和叶绿素a浓度的解释率较大；1 000 m河岸带缓冲区的土地利用（主要为林地和耕地）通过作用于水体理化参数中的总氮、总磷、亚硝酸盐氮、化学需氧量和浊度间接影响两季浮游植物密度和叶绿素a浓度，其中物理因子（浊度）对两季浮游植物密度和叶绿素a浓度均产生显著影响. |
| 英文摘要 |
| In order to explore the characteristics of phytoplankton communities in the sediment-laden rivers of the Jinghe River Basin and their response to changes in environmental factors， this study systematically investigated the main stream and eight typical tributaries of the Jinghe River Basin in November 2021 （autumn） and May 2022 （spring）. A total of 209 species of phytoplankton were identified in seven phyla and 72 genera， with that in autumn of 2021 （126 species） being lower than that in spring of 2022 （179 species）. Bacillariophyta and Chlorophyta were the dominant phyla of phytoplankton in the two seasons. In the autumn of 2021， the average density and biomass of phytoplankton were 89.21×104 cells·L-1 and 1.48 mg·L-1， while in the spring of 2022， the average density and biomass of phytoplankton were 265.92×104 cells·L-1 and 4.80 mg·L-1. The Shannon-Wiener diversity index and Margalef richness index of phytoplankton in spring 2022 were higher than those in autumn 2021， while the Pielou evenness index had no significant seasonal difference. The results of correlation analysis showed that nitrogen and phosphorus nutrients， chemical oxygen demand， dissolved oxygen， and turbidity were the main environmental factors affecting the density of dominant species of phytoplankton in the two seasons， and the density of most dominant species was significantly negatively correlated with turbidity. The results of variation decomposition and the structural equation model showed that the physical and chemical parameters of the water body had a greater relative contribution to the phytoplankton density and Chl-a concentration in the two seasons. The land use （mainly forest land and cultivated land） in the 1 000 m riparian buffer zone indirectly affected the phytoplankton density and Chl-a concentration in the two seasons by acting on the total nitrogen， total phosphorus， nitrite nitrogen， chemical oxygen demand， and turbidity in the physical and chemical parameters of the water body， and the physical factor （turbidity） had a significant effect on the phytoplankton density and Chl-a concentration in the two seasons. |
