| 渭河流域浮游植物群落结构时空分异特征及其环境影响因子 |
| Spatial and Temporal Characteristics of Phytoplankton Community Structure and Environmental Factors in the Weihe River Basin |
| 投稿时间：2019-06-19 修订日期：2021-05-14 |
| DOI：10.15928/j.1674-3075.201906190156 |
| 中文关键词:渭河流域 浮游植物 群落结构 多样性指数 环境因子 |
| 英文关键词:Weihe River basin phytoplankton community structure diversity index environmental factors |
| 基金项目:国家自然科学基金（41571512，41471420）；陕西省自然科学基础研究计划项目（2019JM-282）；中央高校基本科研业务费专项（GK201903080） |
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| 中文摘要: |
| 探讨渭河流域浮游植物不同水期的群落结构时空分异特征，可为流域水生态恢复提供理论依据。于2017年10月（枯水期）和2018年6月（丰水期）分别在渭河流域的渭河、泾河及北洛河设置12个样点，调查浮游植物的群落组成，研究环境因子（海拔、河深、流速、河宽、水温、电导率、大气压、溶解氧、pH）的变化，通过Shannon-Wiener多样性指数（H’）、Pielou均匀度指数（J）和Margalef物种丰富度指数（dMa）反映浮游植物群落多样性，探究浮游植物群落结构与环境因子的关系。结果表明，渭河流域共检测到浮游植物6门、90种，其中枯水期5门、25种，丰水期6门、73种，两个时期均以绿藻门和硅藻门为主，主要优势种为绿藻门的丝藻（Ulotrix sp.）和硅藻门的舟形藻（Navicula spp.）。典范对应分析（CCA）显示，渭河水系枯水期浮游植物群落结构的主要影响因子为pH和溶解氧浓度，丰水期为流速；泾河水系枯水期为溶解氧浓度、流速和pH，丰水期为流速；北洛河水系枯水期为电导率，丰水期为电导率和水温。 |
| 英文摘要: |
| In this study, phytoplankton community structure in different water periods in Weihe River basin was investigated, and the relationship of the temporal and spatial variations of the phytoplankton community with environmental factors were analyzed. The objective was to provide data to support ecological restoration in the Weihe River basin. In October 2017 (dry season) and June 2018 (wet season), a phytoplankton community investigation was conducted at 12 sampling sites on the main stem of Weihe River and two tributaries (Jinghe River and Beiluo River), focusing on species composition, phytoplankton density and biomass, and community biodiversity indices. Environmental factors were measured synchronously, including altitude, river depth and width, water velocity, water temperature, conductivity, atmospheric pressure, dissolved oxygen and pH. A total of 90 phytoplankton species from 6 phyla were identified in the Weihe River basin: 25 species from 5 phyla in the dry season and 73 species from 6 phyla in the wet season. Chlorophyta and Bacillariophyta were the dominant taxa in both periods, and the dominant species were Ulotrix sp., a green algae, and Navicula spp., a diatom. During the dry season, the average phytoplankton density and biomass for the all sampling sites were 24.32×104 ind/L and 0.1561 mg/L, and the average phytoplankton density and biomass during the wet season were 70.21×104 ind/L and 0.1020 mg/L. Ranges for the Shannon-Wiener diversity index (H’), Pielou evenness index (J) and Margalef species richness index (dMa) were, respectively, 0.5284-1.5281, 0.2175-0.7468, 0.3311-1.0858 in dry season and 0.5553-2.6881, 0.2966-0.9999, 0.2543-1.7726 in wet season. During the study period, no significant differences were observed in phytoplankton species number, density, biomass or biodiversity indices (P＞0.05). Canonical correspond analysis (CCA) showed that the primary environmental factors influencing phytoplankton community structure in dry season were pH and dissolved oxygen for Weihe River, dissolved oxygen, velocity and pH for Jinghe River, and conductivity for Beiluo River. In the wet season the primary factors were velocity for both the Weihe and Jinghe Rivers, and conductivity and water temperature for Beiluo River. |
| 杨 涛,王 伟,陈 佳,杨艳妮,王 硕,李小平.2021.渭河流域浮游植物群落结构时空分异特征及其环境影响因子[J].水生态学杂志,42(3):63-71. |
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