水生生物学报2024，Vol.48Issue(3)：426-435,10.DOI:10.7541/2024.2023.0152
内源营养负荷对4种常见沉水植物生长、形态和资源分配策略的影响
INTERNAL NUTRIENT LOAD ON THE GROWTH,MORPHOLOGY,AND RESOURCE ALLOCATION STRATEGIES OF FOUR COMMON SUBMERGED PLANTS
摘要
Abstract
Internal nutrient is one of the important causes of eutrophication in lakes,exerting notable impact on the physiology and growth of submerged plants.In order to explore the effects of internal nutrient loading on the growth,morphology,and resource allocation of submerged plants,this study managed sediment nutrient concentrations and scrutinized the responses of diverse functional traits within four prevalent submerged plant species:Vallisneria natans,Hydrilla verticillata,Myriophyllum spicatum and Potamogeton wrightii.The results showed that:(1)The increase of internal nutrient loading promoted a stimulating effect on the growth of the four submerged plants,with Vallisneria natans displaying higher population quantity and total biomass compared to the other submerged plants.However,a decline in population numbers across all four species was observed when sediment nutrient content became excessive(C:73.33 mg/g;N:4.94 mg/g;P:0.68 mg/g).(2)The response trend of submerged plant morphological characteristics to changes in sediment nutrient content exhibited variability.The height of all species gradually increased,while there was no significant change in root length.Individual fresh weight of V.natans and P.wrightii continued to increase,while the fresh weight of H.verticillata and M.spicatum first increased and then decreased.(3)Alterations in internal nutrient content significantly influenced the resource allocation of the four plants.As sediment nutrient content increased,the proportion of aboveground biomass within the submerged plants significantly increased,leading to a concurrent decline in the root-to-shoot ratio.Furthermore,the content of photosynthetic pigments exhibited a marked increase with enhanced sediment nutrient content.However,it is important to note that excessive nutrient content nega-tively impacted the synthesis of photosynthetic pigments.In summary,the results of this study indicate that the adap-tability of V.natans to changes in sediment nutrient loading is the strongest,so selecting V.natans as a pioneer species for ecological restoration in eutrophic water bodies can effectively improve the restoration efficiency of submerged macrophytes.关键词
沉水植物/内源营养负荷/形态特征/资源分配Key words
Submerged plants/Internal nutrient load/Morphological character/Resource allocation分类
农业科技引用本文复制引用
庞伟程,付贵萍,沈哲文,孙尚省,马巾,华兆晖,丑庆川..内源营养负荷对4种常见沉水植物生长、形态和资源分配策略的影响[J].水生生物学报,2024,48(3):426-435,10.基金项目
国家自然科学基金(32101319和32271704) （32101319和32271704）
广东省基础与应用基础研究基金(2022A1515010562)资助[Supported by the National Natural Science Foundation of China(32101319 and 32271704) （2022A1515010562）
Basic and Applied Basic Research Foundation of Guang-dong Province(2022A1515010562)] （2022A1515010562）
