The study investigated the responses of the submerged macrophyte Vallisneria natans (V. natans) to snails (Bellamya aeruginosa) at different densities, with changes in physiological parameters, morphology, leaf-epiphytic bacteria community and water quality parameters examined. The changes of water quality parameters (pH, total nitrogen (TN), total phosphorus (TP) and total organic carbon (TOC)) indicated that snails secreted nutrients into water. Changes in morphological and physiological parameters (fresh weight, root length, shoot height, chlorophyll, malondialdehyde (MDA), activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD)) demonstrated that the presence of snails were beneficial to the growth of submerged macrophytes. Microbial diversity analyses indicated that snails could decrease microbial community richness and diversity. At medium densities (340 ind. m⁻²), an increase in snail density was beneficial to the growth of submerged macrophytes. The results of this study provide theoretical guidance and technical support for the maintenance and restoration of submerged macrophytes.

该研究调查了淹没的植物植物南方缬草（V. natans）对蜗牛（Bellamya aeruginosa）的反应。）在不同的密度下，随着生理参数，形态，叶表生细菌群落和水质参数的变化而变化。水质参数（pH，总氮（TN），总磷（TP）和总有机碳（TOC））的变化表明，蜗牛将营养物质分泌到水中。形态和生理参数的变化（鲜重，根长，枝条高度，叶绿素，丙二醛（MDA），超氧化物歧化酶（SOD），过氧化氢酶（CAT）和过氧化物酶（POD）的活性）表明，蜗牛的存在对沉水植物的生长。微生物多样性分析表明，蜗牛可能会降低微生物群落的丰富度和多样性。在中等密度（340 ind。m ^-2），蜗牛密度的增加有利于淹没大型植物的生长。研究结果为水下大型植物的维护和恢复提供理论指导和技术支持。