胶州湾滨海湿地土壤无机CO_(2)通量析因分析及其吸收机理  

Flux factorial analysis and the absorption mechanism of soil inorganic CO_(2)in coastal wetland of Jiaozhou Bay

作　　者：郭耀宇 王筱彤 杨少旭 于纪民 郗敏 Guo Yaoyu;Wang Xiaotong;Yang Shaoxu;Yu Jimin;Xi Min(College of Environmental Science and Engineering,Qingdao University,Qingdao 266071,Shandong,P.R.China;Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao,Qingdao 266071,Shandong,P.R.China)

机构地区：[1]青岛大学环境科学与工程学院,山东青岛266071 [2]青岛市碳中和生态环境技术创新中心,山东青岛266071

出　　处：《湿地科学》2025年第1期96-107,共12页Wetland Science

基　　金：国家自然科学基金项目(42171116);山东省高等学校青年创新团队计划项目(2022KJ147)资助。

摘　　要：为了探究滨海湿地土壤无机CO_(2)通量(R_(io))特征及土壤对CO_(2)的无机吸收机理,采集胶州湾光滩、盐地碱蓬(Suaeda salsa)沼泽和芦苇(Phragmites australis)沼泽3种典型湿地的土壤,基于室内控制试验,分析了土壤R_(io)特征;通过构建多因素析因模型,识别了土壤R_(io)影响因素的主效应及交互效应,并结合同位素示踪技术明确了CO_(2)被土壤吸收后的去向。研究结果表明,胶州湾3种湿地土壤均存在无机吸收CO_(2)的现象,且不同湿地土壤R_(io)差异显著,其中芦苇沼泽土壤R_(io)平均值最高,为-0.171 mg/(kg·d),盐地碱蓬沼泽[-0.230 mg/(kg·d)]和光滩湿地[-0.274 mg/(kg·d)]的R_(io)平均值依次减小。土壤R_(io)与pH显著负相关(r=0.82,p<0.05);析因分析结果表明,pH是解释土壤R_(io)变化的最主要因素;而土壤pH与电导率的交互作用对土壤R_(io)影响最强。δ^(13)C同位素示踪试验结果显示,土壤将吸收的δ^(13)C-CO_(2)转化为土壤溶解性无机碳(DIC)和土壤无机碳(SIC),在试验开始之后的1~24 h内,土壤中约10%的DIC转化为SIC,以固态的形式直接固定于土壤中。To explore the characteristics of inorganic CO_(2)flux(R_(io))in coastal wetland soil and the inorganic absorption mechanism of CO_(2)in soil,soils from three representative wetland types of mudflat,Suaeda salsa marsh,and Phragmites australis marsh in Jiaozhou Bay were collected.Based on the laboratory-controlled experiments,the characteristics of soil R_(io)were analyzed.The main influencing factors of R_(io)and their interactions were identified through the construction of a multifactor factorial model.In addition,the distribution of the absorbed CO_(2)in wetland soil was clarified by isotope tracer technology.Results showed that the CO_(2)absorption process existed in different types of soils in Jiaozhou Bay coastal wetland and the difference of R_(io)was significant,with the specific order of Phragmites australis marsh(average R_(io)of-0.171 mg/(kg·d)),Suaeda salsa marsh(average R_(io)of-0.230 mg/(kg·d)),mudflat(average R_(io)of-0.274 mg/(kg·d)).The soil R_(io)was negatively correlated with pH(r=0.82,p<0.05).Results of multifactor factorial model showed that the pH was the most significant influence for soil R_(io)in coastal wetland,and the interaction between pH and EC was the most intense.The 13C isotope tracer showed that the absorbed CO_(2)was converted into soil dissolved inorganic carbon and soil inorganic carbon.In addition,within 1-24 h of the reaction,about 10%of dissolved inorganic carbon in the soil was converted to soil inorganic carbon,fixed directly into the soil in a solid form.

关 键 词：滨海湿地 盐碱土 CO_(2)通量 同位素示踪 析因分析 胶州湾 

分 类 号：X142[环境科学与工程—环境科学]