水生生物学报2024，Vol.48Issue(12)：2042-2054,13.DOI:10.7541/2024.2024.0161
贵州草海沉水植物现状调查与影响因素分析
Investigation of submerged macrophytes current situation and analysis of influence factors in Caohai,Guizhou
摘要
Abstract
As the main primary producer in freshwater lake ecosystem,submerged macrophytes organically connect lake water bodies and sediments,playing an important role in maintaining the health of these ecosystems.In order to understand the current degradation and causes of submerged macrophytes in Caohai Lake,Guizhou,we investigated the macrophyte community and sediment physiochemical properties.The spatial and temporal distribution patterns of submerged macrophytes and sediment nutrient characteristics were estimated using grid point and belt transect me-thods,and key factors impacting submerged macrophytes were identified.In addition,seed bank germination experi-ments were conducted to estimate the restoration potentia of submerged macrophytes in Caohai.Results showed the presence of 10 submerged macrophyte species:Charophyte sp.,Myriophyllum spicatum,Stuckenia pectinata,Najas marina,Potamogeton lucens,Hydrilla verticillate,Potamogeton perfoliatus,Ceratophyllum demersum,Potamogeton maackianus,Polygonum amphibium,and Potamogeton acutifolius.The coverage and biomass of these macrophytes exhibited significant seasonal and spatial variations.A significant negative correlation between the total coverage of submerged macrophytes and nutrient salts in the water and sediment indicated that these plants play an ecological role in reducing nutrient levels,while excessive nutrients negatively affect the growth.At present,nutrient release from sediments in Caohai appears to be the main factor affecting submerged macrophyte growth.Compared to other lakes,surface sediment of Caohai is characterized by loosen and high moisture content,making it difficult for macrophytes to plant and germinate.Meanwhile,the loosen sediment also easily releases soluble nutrients into the water.Furthermore,the photosynthesis of submerged macrophytes is impacted by reduced water transparency caused by excessive phyto-plankton growth and shading from suspended plant residues.Despite these challenges,Caohai has good potential for the natural restoration of submerged macrophytes.However,the current high nutrient concentrations and the loose nature of the sediment limit this restoration.This study provides a theoretical basis and technical reference for future implementation of stable-state transformation control,water quality improvement,and aquatic plant restoration strate-gies in Caohai.关键词
草海/生态系统/富营养化/沉水植物/沉积物/总氮Key words
Caohai/Ecosystem/Eutrophication/Submerged macrophytes/Sediment/Total nitrogen分类
农业科技引用本文复制引用
李贝宁,马思怡,刘懿,白国梁,唐亚东,吴振斌,张义..贵州草海沉水植物现状调查与影响因素分析[J].水生生物学报,2024,48(12):2042-2054,13.基金项目
国家自然科学基金(42307336) （42307336）
中国博士后面上基金项目(2023M743723) （2023M743723）
贵州省生态环境厅环境科技项目 （）
武汉市重点研发项目(2023020402010623)资助[National Natural Science Foundation of China(42307336) （2023020402010623）
China Postdoctoral Science Founda-tion(2023M743723) （2023M743723）
Environmental science and technology project of Guizhou Department of Ecological Environment （）
Wuhan Science and Technology Plan Project(2023020402010623).] （2023020402010623）
