淤泥质潮滩大型底栖动物群落及其碳库:夏季温岭隘顽湾的启示

Macrobenthos community and living organic carbon pools on muddy tidal flat:Implications from Aiwan Bay of Wenling in summer

潮间带是连接陆地生态系统与海洋生态系统的关键带状区域,其中,淤泥质潮滩是重要而容易被忽视的CO 2自然汇集生境,该生境中不同门类的大型底栖动物在促进碳的输入、传递和存储过程中发挥核心作用。本文以夏季浙江东部沿海隘顽湾淤泥质潮滩断面作为切入点,研究大型底栖动物群落结构及生物碳库。结果显示,隘顽湾淤泥质潮滩大型底栖动物平均丰度为105.2±37.2 ind m^(2),平均生物量为46.9±6.4 g m^(2),其生境内主要类群组成为甲壳类动物和软体动物,生态系统健康程度整体表现为优秀。隘顽湾潮滩中大型底栖动物有机碳含量由高到低分别为其他类(包括鱼类、纽虫)动物(40.95%)、多毛类动物(22.98%)、甲壳类动物(17.24%)、棘皮动物(15.90%)和软体动物(10.76%)。估算研究区域大型底栖动物碳库约为163.90 Mg,其中甲壳类动物为最大贡献者,占比59.80%。淤泥质潮滩大型底栖动物群落结构与生物碳库大小的探究,可作为我国蓝碳调查体系构建的重要科学依据,也可为进一步量化沿海生境整体碳库大小提供基础数据。

The intertidal zone is a key area connecting terrestrial ecosystems and marine ecosystems,among which muddy tidal flat is an important and easily overlooked CO 2 collection habitat,and the macrobenthos play a central role in the input,transport and preservation of carbon.Macrobenthos community and living organic carbon pools of muddy tidal flat were analyzed in Aiwan Bay,eastern coast of Zhejiang Province in summer.The average abundance of macrobenthos was 105.2±37.2 ind m^(2),and the average biomass was 46.9±6.4 g m^(2).The major taxa components within the habitat were crustaceans and mollusks,and the ecosystem health status was excellent.The organic carbon contents of macrobenthos at Aiwan Bay from highest to lowest were other animals including fish and nemertinea(40.95%),polychaetas(22.98%),crustaceans(17.24%),echinoderms(15.90%),mollusks(10.76%),and estimated the macrobenthos carbon pool was 163.90 Mg,of which crustaceans have the largest contribution rate,accounting for 59.80%.The exploration of macrobenthos community structure and living organic carbon pools size in muddy tidal flat can provide scientific suggestion for constructing the blue carbon survey system and supply fundamental data to further quantify the overall carbon pool size in coastal habitats.