摘要
为探究菹草(Potamogeton crispus)生长、衰亡期对生态环境的效应,本文以南水北调东线源头调蓄湖泊——高邮湖为研究区域,通过分析湖泊水质及浮游植物群落随菹草生长衰亡过程的变化情况,揭示高邮湖菹草暴发下水环境状况变化。结果表明:在菹草生长期水体透明度明显提高,且总氮浓度有较大程度的下降;而在菹草衰亡期,菹草生物量越高的区域水质越差。菹草在生长期对水环境起到一定的净化效果,而菹草衰亡降解会造成水质恶化。菹草生长期浮游植物密度和生物量显著低于衰亡期,生长期菹草高、中生物量区的浮游植物密度和生物量低于低生物量区,而在菹草衰亡期高、中生物量区的浮游植物密度和生物量高于低生物量区。冗余分析结果表明,pH、溶解氧、氨氮、硝态氮、总磷、高锰酸盐指数是菹草生长衰亡过程影响浮游植物群落结构的主要环境因子。分段结构方程模型模拟结果表明,菹草生物量可对浮游植物生物量产生直接效应,也可以通过改变环境因子对浮游植物生物量产生间接效应。
In order to investigate the effect of Potamogeton crispus on the ecological environment during the growth and decomposition period,this paper took Lake Gaoyou,the source storage lake of the South-to-North Water Diversion East Route,as the study area.By analyzing the changes of lake water quality and phytoplankton community with the growth and decomposition process of Potamogeton crispus,we revealed the changes of water environment condition under Potamogeton crispus outbreak in Lake Gaoyou.The results showed that water transparency increased significantly while total nitrogen concentration decreased to a greater extent during the growth period of Potamogeton crispus.Water quality was poorer during the Potamogeton crispus decomposition period in areas with higher Potamogeton crispus biomass.The growth and development of Potamogeton crispus had a purifying effect on the water quality,while the degradation of Potamogeton crispus by their demise can led to deterioration of water quality.Phytoplankton density and biomass were significantly lower in the growing phase of Potamogeton crispus than in the decomposition phase,and were lower in the high and medium biomass zones of Potamogeton crispus than in the low biomass zone during the growing phase.Howeverm in the decomposition phase of Potamogeton crispus,the high and medium biomass zones of Potamogeton crispus were higher in phytoplankton density and biomass than in the low biomass zone.The results of redundancy analysis showed that pH,dissolved oxygen,ammonia nitrogen,nitrate nitrogen,total phosphorus and COD Mn were the main environmental factors that influenced the structure of phytoplankton community during the growth and decline of Potamogeton crispus.Piecewise structural equation modeling results indicated that Potamogeton crispus biomass can have a direct effect on phytoplankton biomass or an indirect effect by changing environmental factor.
作者
张鑫
张又
蔡平
刘荣坤
黎明杰
张晖
高俊峰
钱宝
蔡永久
燕文明
Zhang Xin;Zhang You;Cai Ping;Liu Rongkun;Li Mingjie;Zhang Hui;Gao Junfeng;Qian Bao;Cai Yongjiu;Yan Wenming(The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,P.R.China;Key Laboratory of Lake and Watershed Science for Water Security,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;Jiangdu Water Conservancy Project Management Office of Jiangsu Province,Yangzhou 225200,P.R.China;Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2024年第6期1681-1693,共13页
Journal of Lake Sciences
基金
湖泊与流域水安全重点实验室重大项目(NKL2023-ZD02)
湖泊与环境国家重点实验室开放基金项目(2022SKL009)
水灾害防御全国重点实验室“一带一路”水与可持续发展科技基金项目(2021491711)联合资助。
关键词
沉水植物
植物腐烂
群落结构
冗余分析
分段结构方程模型
高邮湖
Submerged plants
macrophyte decomposition
community structure
redundancy analysis
piecewise structural equation model
Lake Gaoyou
