摘要
浮游植物群落组成变化能有效地改变水体溶解性有机质(DOM)组成特征,研究黄河小浪底水库DOM光谱特征和浮游植物群落的响应关系,可为库区水资源管理和水生态环境保护提供科学依据。采用三维荧光光谱结合平行因子分析法,分析DOM的光谱特征及来源;探究浮游植物群落结构特征,运用多样性指数评价库区水质,利用冗余分析探讨影响浮游植物群落的关键环境因子;利用相关性分析探究DOM组成与浮游植物群落的关系。结果表明:共鉴定出浮游植物6门73属110种,库区群落结构和相对丰度以金藻门、硅藻门和绿藻门为主。空间上,相对丰度表现为中游>坝前>上游>坝后,群落特征存在明显空间异质性。多样性指数评价结果表明库区水质为中污型,其中,中游和坝前多样性指数显著高于上游和坝后,群落结构更复杂,说明筑坝拦截后浮游植物生物活性增强。冗余分析结果显示,叶绿素a、总有机碳、总氮、溶解氧和pH是影响库区浮游植物群落结构的主要驱动因子。DOM主要由紫外区类腐殖质(C1)和类色氨酸(C2)组成,受陆源输入和内源贡献的综合影响,其中,藻类和浮游植物释放等内源贡献较大。相关性分析表明,浮游植物群落结构与类蛋白物质正相关,优势种与自生源指数显著正相关,说明库区水体浮游植物对DOM具有重要贡献。
Changes in phytoplankton community composition can effectively change the composition characteristics of dissolved organic matter(DOM)in water.By studying the spectral characteristics of DOM and the response relationship of phytoplankton community in Xiaolangdi Reservoir of the Yellow River,this study aims to provide a scientific basis for water resources management and water ecological environment protection in the reservoir area.Three-dimensional fluorescence spectroscopy combined with parallel factor analysis was used to analyze the spectral characteristics and sources of DOM.To explore the structural characteristics of phytoplankton community,the diversity index was used to evaluate the water quality of the reservoir area,and the key environmental factors affecting phytoplankton community were explored by redundancy analysis.Correlation analysis was used to explore the relationship between DOM composition and phytoplankton community.The results showed that a total of 110 species of phytoplankton in 6 phyla,73 genera were identified,and the community structure and relative abundance of phytoplankton were mainly found in the phylum Chrysophyta,Bacillariophyta,and Chlorophyta.Spatially,the relative abundance showed obvious spatial heterogeneity in the community characteristics before the middle reaches>in front of the dam>in the upstream>behind the dam.There was obvious spatial heterogeneity in the community characteristics.The results of diversity index evaluation showed that the water quality in the reservoir area was medium pollution type,and the diversity index in the middle and before the dam was significantly higher than that in the upstream and behind the dam,and the community structure was more complex,indicating that the biological activity of phytoplankton was enhanced after dam construction.The results of redundancy analysis showed that chlorophyll a,total organic carbon,total nitrogen,dissolved oxygen,and pH were the main driving factors affecting phytoplankton community structure in the reservoir area.DOM is mainly composed of humus(C1)and tryptophan(C2)in the ultraviolet region,which are affected by the comprehensive influence of terrestrial input and endogenous contribution,and contribute greatly to the endogenous such as algae and phytoplankton.Correlation analysis showed that phytoplankton community structure was positively correlated with protein-like substances,and dominant species were significantly positively correlated with biological index,indicating that phytoplankton in the reservoir area had an important contribution to DOM.
作者
武俐
来梦媛
杨萌
付纪薇
赵同谦
王亮
WU Li;LAI Mengyuan;YANG Meng;FU Jiwei;ZHAO Tongqian;WANG Liang(Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China;Henan Jiyuan Ecological Environment Testing Center,Jiyuan 454650,China)
出处
《生态学报》
北大核心
2025年第4期1736-1747,共12页
Acta Ecologica Sinica
基金
国家自然科学基金(U23A2016)
河南省自然科学基金面上项目(232300421248)
河南省高等学校重点科研项目计划(22A610002)。
关键词
小浪底水库
浮游植物
溶解性有机质
群落结构
环境因子
Xiaolangdi reservoir
phytoplankton
dissolved organic matter
community structure
environmental factors
