The invasive species Spartina alterniflora are widely distributed on the coastline of China. In this study, three common physical control treatments for S. alterniflora were simulated in the laboratory environment. The results showed that “mowing + flooding” (MF) and “mowing + ploughing” (MP) treatments eradicated S. alterniflora completely during the 60-day experiment. However, the flooding and ploughing treatments and the decay of S. alterniflora would change the biogeochemical feature of the sediment, resulting in the abnormal release of nutrients. Spearman's correlation analysis and water quality analysis results showed that the average concentrations of NH₄⁺-N (1.80 mg/L) and TP (0.43 mg/L) in MF treatment, as well as NH₄⁺-N (1.49 mg/L), NO₃⁻-N (0.95 mg/L), and NO₂⁻-N (0.35 mg/L) in MP treatment greatly increased due to the migration and transformation of nutrient. Parallel factor analysis (PARAFAC) confirmed that three components of dissolved organic matter (DOM) and their rising in overlying water were related to the decomposition of S. alterniflora and the disturbed sediment, which could increase the risk of eutrophication in offshore water bodies. In addition, three physical control treatments changed the structure and composition of the bacterial community by altering the colonization of specific bacteria and the sediment microenvironment. Mantel test analysis and structural equation modeling (SEM) showed that the variation of key nutrients in MF and MP treatments had significant impacts on bacterial community structure. This study revealed the effects of physical control of S. alterniflora on migration and transformation mechanism of nutrients in coastal wetlands and the structure of the bacterial community.

入侵物种互花米草广泛分布于我国沿海地区。在这项研究中，在实验室环境中模拟了互花米草的三种常见物理控制处理。结果表明，在为期 60 天的实验中，“割草 + 淹水”（MF）和“割草 + 耕作”（MP）处理完全根除了互花米草。然而，漫灌和翻耕处理以及互花米草的腐烂会改变沉积物的生物地球化学特征，导致营养物质的异常释放。Spearman 的相关分析和水质分析结果表明，NH ₄ ^{+的平均浓度}MF 处理中的 -N (1.80 mg/L) 和 TP (0.43 mg/L)，以及 NH ₄ ⁺ -N (1.49 mg/L)、NO ₃ ⁻ -N (0.95 mg/L) 和 NO ₂ ⁻ -N (0.35 mg/L) 在 MP 处理中由于养分的迁移和转化而大大增加。平行因子分析（PARAFAC）证实，溶解有机物（DOM）的三种成分及其在上覆水中的上升与互花米草的分解有关以及扰动的沉积物，这可能会增加近海水体富营养化的风险。此外，三种物理控制处理通过改变特定细菌的定植和沉积物微环境来改变细菌群落的结构和组成。Mantel检验分析和结构方程模型（SEM）表明，MF和MP处理中关键营养素的变化对细菌群落结构有显着影响。本研究揭示了互花米草物理控制对滨海湿地养分迁移转化机制和细菌群落结构的影响。