Response of community composition and biomass of submerged macrophytes to variation in underwater light, wind and trophic status in a large eutrophic shallow lake  

作　　者：Baili Dong Yongqiang Zhou Erik Jeppesen Kun Shi Boqiang Qin 

机构地区：[1]Taihu Laboratory for Lake Ecosystem Research,State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Bioscience,Aarhus University,Vejlsovej 25,8600 Silkeborg,Denmark [4]Sino-Danish Centre for Education and Research(SDC),University of Chinese Academy of Sciences,Beijing 100049,China [5]Limnology Laboratory,Department of Biological Sciences and Centre for Ecosystem Research and Implementation,Middle East Technical University,Ankara,Turkey

出　　处：《Journal of Environmental Sciences》2021年第5期298-310,共13页环境科学学报（英文版）

基　　金：jointly funded by the National Key R&D Program of China(No.2017YFC0405205);the Major Projects on Control and Rectification of Water Body Pollution(No.2017ZX07203–004);the National Natural Science Foundation of China(Nos.42071118 and 41621002);supported by the TüBITAK,BIDEB program 2232.

摘　　要：Light climate is of key importance for the growth, community composition of submerged macrophytes in lakes and, they, in turn, are affected by lake depth and the degree of eutrophication. To test the relationships between submerged macrophyte presence and the ratio of Secchi disk depth(SDD) to water depth, i.e. SDD/depth, nutrients and wind, we conducted an extensive sampling campaign in a macrophyte-dominated area of the eastern region( n = 36) in 2016 in Lake Taihu, China, and combined the data gathered with results from extensive physico-chemical monitoring data from the entire lake. We confirmed that SDD/Depth is the primary factor controlling the community composition of macrophytes and showed that plant abundance increased with increasing SDD/Depth ratio( p < 0.01), but that only SDD/Depth > 0.4 ensured growth of submerged macrophytes. Total phosphorus and total nitrogen also influenced the growth and community composition of macrophytes( p < 0.01), while Chl a was an indirectly affecting factor by reducing underwater light penetration. Wave height significantly influenced plant abundance( p < 0.01), whereas it had little effect on the biomass( p > 0.05). The key to restore the macrophyte beds in the lake is to reduce the nutrient loading. A decrease of the water level may contribute as well in the shallow bays but will not bring plants back in the main part of the lake. As the tolerance of shade and nutrients varied among the species studied, this should be taken into account in the restoration of lakes by addition of plants.

关 键 词：Underwater light climate Water depth Community composition MACROPHYTE EUTROPHICATION 

分 类 号：X524[环境科学与工程—环境工程]