天然盐度梯度下闽江河口湿地土壤有机碳密度及储量变化  

Changes of Soil Organic Carbon Density and Stock in the Minjiang River EstuarineWetland under Natural Salinity Gradient

作　　者：陈昭一 杨艳丽 武政 谌小慧 刘元恭 仝川[1,2] 张彦[1,2] CHEN Zhaoyi;YANG Yanli;WU Zheng;CHEN Xiaohui;LIU Yuangong;TONG Chuan;ZHANG Yan(Institute of Geography,Fujian Normal University,Fuzhou 350117,Fujian,P.R.China;Fujian Provincial Key Laboratory for Subtropical Resources and Environment,Fujian Normal University,Fuzhou 350117,Fujian,P.R.China;College of Geography and Environmental Science,Hainan Normal University,Haikou 571158,Hainan,P.R.China)

机构地区：[1]福建师范大学地理研究所,福建福州350117 [2]福建师范大学福建省亚热带资源与环境重点实验室,福建福州350117 [3]海南师范大学地理与环境科学学院,海南海口571158

出　　处：《湿地科学》2024年第2期218-226,共9页Wetland Science

基　　金：福建省科技厅公益类项目(2021R1002002)资助。

摘　　要：为了探究不同盐度条件下闽江河口湿地土壤剖面有机碳密度和储量的变化特征,根据天然盐度梯度,选取塔礁洲(0.172 mS/cm)、道庆洲(0.175 mS/cm)、蝙蝠洲(0.962 mS/cm)和鳝鱼滩(1.392 mS/cm)4处湿地作为研究样地,分别钻取100 cm深的土壤剖面样品,通过2 cm间隔高分辨率,测定土壤pH、容重、含水率和总有机碳含量,揭示不同湿地土壤剖面有机碳密度和储量的变化特征及其影响因素。结果表明,闽江河口塔礁洲、道庆洲、蝙蝠洲和鳝鱼滩4处典型湿地土壤剖面有机碳密度分别为91.16 kg/m^(2)、92.71 kg/m^(2)、63.21 kg/m^(2)和98.30 kg/m^(2);闽江河口湿地表层土壤有机碳含量高于深层土壤,但深层土壤有机碳密度明显高于表层土壤,随着剖面深度的增加,有机碳密度不断增加;塔礁洲、道庆洲、蝙蝠洲和鳝鱼滩4处湿地0~100 cm土壤剖面有机碳储量分别为455.80 t/hm^(2)、463.55 t/hm^(2)、316.03 t/hm^(2)和491.52 t/hm^(2);随着局地盐度增加,土壤剖面有机碳储量增加,深层土壤有机碳储量高于表层土壤;随着土壤容重、盐度和深度的增加,土壤有机碳密度和有机碳储量逐渐升高,但是不同湿地局地环境特征的差异使得土壤有机碳密度和有机碳储量对土壤含水率的响应程度不同;植被类型、季节水热变化和人类活动是影响闽江河口湿地土壤有机碳储量的重要因素。对比中国不同区域、不同类型土壤深层有机碳储量,发现闽江河口湿地土壤有机碳储量较高,土壤类型和区域沉积环境是影响不同区域土壤有机碳储量差异的重要因素。In order to investigate the characteristics of organic carbon density and storage in soil profiles of the Minjiang River estuarine wetlands under different salinity conditions,four natural wetlands,the Tajiaozhou wetland(0.172 mS/cm),the Daoqingzhou wetland(0.175 mS/cm),the Bianfuzhou wetland(0.962 mS/cm)and the Shanyutan wetland(1.392 mS/cm)were selected as the study sites according to the natural salinity gradient.Soil profiles of 100 cm depth were drilled in the four sites,respectively.Soil pH,bulk weight,water content,and total organic carbon content were determined at 2 cm intervals to reveal the variation characteristics of organic carbon density and stock in soil profiles of different wetlands and their influencing factors.The results showed that the organic carbon densities in the soil profiles were 91.16 kg/m^(2),92.71 kg/m^(2),63.21 kg/m^(2)and 98.30 kg/m^(2)in the Tajiaozhou wetland,the Daoqingzhou wetland,the Bianfuzhou wetland and the Shanyutan wetland,respectively.Soil organic carbon contents in the surface layers of the four wetlands were higher than those in the deeper layers.However,organic carbon densities in deeper layers were significantly higher than those in the surface soils,and organic carbon density increased with the increase of soil depths.The organic carbon stocks in 0~100 cm soil profiles in the Tajiaozhou wetland,the Daoqingzhou wetland,the Bianfuzhou wetland and the Shanyutan wetland,were 455.80 t/hm^(2),463.55 t/hm^(2),316.03 t/hm^(2)and 491.52 t/hm^(2),respectively.With the increase of local salinity,organic carbon stocks in soil profiles increased,and organic carbon stocks in the deeper layers were higher than those in the surface soil.With the increase of soil bulk density,salinity and depth,soil organic carbon density and stock increased gradually.However,the differences in local environmental characteristics of different wetlands resulted in varying responses of soil organic carbon density and storage to soil water content.We suggest that vegetation types,seasonal hydrothermal

关 键 词：天然盐度梯度 闽江河口湿地 土壤剖面 有机碳 碳储量 

分 类 号：P934[天文地球—自然地理学]