三种生境因子对沉水植物生长的影响OA

[Objective]This study aimed to investigate the effects of temperature levels,sediment types,and water body areas on the growth of submerged macrophytes.[Method]Four submerged macro-phyte species,namely Hydrilla verticillata,Myriophyllum spicatum,Vallisneria natans and Potamogeton maackianus,were selected as research materials.A factorial experiment was designed with two tempera-ture levels(ambient and warming),two sediment types(clay and sand),and two water body areas(large and small).Plant growth morphological traits,including biomass,plant height,and root length,were measured to examine the effects of these three environmental factors on the growth of submerged macrophytes.[Result]Sediment type was identified as the dominant factor influencing the growth of sub-merged macrophytes,with species-specific interactive effects among the three factors.Under ambient level in small water body area,the biomass,plant height,and leaf weight of H.verticillata,as well as the biomass,plant height,and stem weight of M.spicatum,were significantly higher in the clay sediment than in the sand sediment.In clay sediment,warming level significantly promoted biomass accumulation of P.maackianus,while inhibiting biomass accumulation of H.verticillata in small water areas.Under elevated temperature,the root length of P.maackianus in clay sediment was significantly greater in small water area than in large water area;conversely,under ambient level,the root length and root weight of P.maackianus in clay sediment were significantly smaller in small water area than in large water area.[Conclusion]The responses of submerged macrophytes to sediment types are species-specific and modula-ted by water body areas and temperature levels.This study reveals the differential responses and adaptive strategies of various submerged macrophyte species to environmental factors,providing scientific support for understanding the ecological adaptability of submerged macrophytes and guiding lake ecosystem con-servation,restoration,and submerged macrophyte community construction.