秋茄替代互花米草对乐清湾大型底栖动物群落结构与稳定性的影响OA

An investigation was conducted in the summer of 2021(pre-restoration)and summer 2022(post-resto-ration)to evaluate the restoration effectiveness of replacing the invasive Spartina alterniflora with mangrove Kandelia obovata in a coastal wetland in Yueqing Bay.We compared macrobenthic community structure,diversity,stability,and their relationships with environmental variables among three habitat types:native mangroves,the S.alterniflora removal area,and bare mudflat.The results showed that:(1)A total of 36 macrobenthic species belonging to 5 phyla and 22 families were identified,with Mollusca accounting for 61.11％of the total number of species;(2)Following restoration,species richness and diversity indices in the S.alterniflora removal area increased,but re-mained lower than those in the native mangrove habitat,indicating that the community was still at an early stage of recovery;(3)Abundance-biomass comparison(ABC)curves showed only minor interannual changes in the abun-dance-biomass pattern in the S.alterniflora removal area,suggesting relatively balanced short-term community sta-bility,whereas the bare mudflat exhibited high biomass(80.60 g·m-2)but low stability;and(4)Combined stress from sediment heavy metals(Zn and Cu)and inorganic nitrogen in porewater significantly constrained com-munity diversity(Mantel test,P＜0.05).Overall,the replacement of S.alterniflora with K.obovata promoted the recovery of macrobenthic communities.However,stable and sustainable restoration outcomes will require effective pollution control and long-term monitoring.