CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; University of Chinese Academy of Sciences, Beijing 100049, China.
CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Center for Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074, China.
Sci Total Environ. 2021 Mar 15;760:143332. doi: 10.1016/j.scitotenv.2020.143332. Epub 2020 Nov 4.
Trait-based approaches have been widely used to explore the relationships between submerged macrophytes and their surrounding environments. However, the effects of functional traits on ecological functions of submerged macrophytes in eutrophic lakes are still not well understood. Here, 1745 individuals of eight dominant submerged macrophyte species in 19 Yangtze floodplain lakes were collected and classified as needle-leaf (Myriophyllum spicatum, Ceratophyllum demersum, Stuckenia pectinatus, Najas minor) or flat-leaf (Vallisneria natans, Hydrilla verticillata, Potamogeton wrightii, Potamogeton maackianus) types according to photosynthetic trait-based cluster analysis. The flat-leaf type submerged macrophytes possessed greater photosynthetic (e.g. higher Fv/Fm) and morphological traits (e.g. higher SLA), while the needle-leaf types held greater stoichiometric traits (e.g. higher plant N/P). Moreover, the RDA analysis indicated that water depth (distribution depth of submerged macrophytes) was the key factor influencing functional traits of flat-leaf types, while it was water quality (e.g. WTP and WChl a) for the needle-leaf types. Furthermore, the flat-leaf types showed better performance in improving underwater light conditions (e.g. SD, K, Z/WD and Red/Blue) and water quality (e.g. WChl a and TSM). Additionally, distribution depth (WD) of the flat-leaf types was shallower than the needle-leaf types in eutrophic shallow lakes along the middle-lower reaches of the Yangtze River. Our study highlights that functional traits of submerged macrophytes in eutrophic shallow lakes affect their ecological functions.
基于功能性状的方法已被广泛用于探索沉水植物与其周围环境的关系。然而，功能性状对富营养化湖泊沉水植物生态功能的影响仍不清楚。在这里，采集了长江中下游 19 个洪泛平原湖泊的 8 种主要沉水植物的 1745 个个体，并根据基于光合作用的功能性状聚类分析将其分为针叶型（菹草、金鱼藻、穗状狐尾藻、竹叶眼子菜）和平叶型（苦草、轮叶黑藻、菹草、马来眼子菜）。平叶型沉水植物具有更高的光合作用（如更高的 Fv/Fm）和形态学特征（如更高的 SLA），而针叶型沉水植物则具有更高的化学计量特征（如更高的植物 N/P）。此外，RDA 分析表明，水深（沉水植物的分布深度）是影响平叶型功能性状的关键因素，而水质（如 WTP 和 WChl a）是影响针叶型功能性状的关键因素。此外，平叶型在改善水下光照条件（如 SD、K、Z/WD 和 Red/Blue）和水质（如 WChl a 和 TSM）方面表现出更好的性能。此外，在长江中下游富营养化浅水湖泊中，平叶型的分布深度（WD）比针叶型浅。本研究强调了富营养化浅水湖泊沉水植物的功能性状影响其生态功能。
