泉州湾红树林湿地土壤CO_2通量周期性变化特征  

Periodic characteristics of soil CO_2 flux in mangrove wetland of Quanzhou Bay,China

作　　者：王宗林[1] 吴沿友[1,2] 邢德科[1] 刘荣成[1] 周贵尧[1] 赵宽[1] 

机构地区：[1]现代农业装备与技术省部共建教育部重点实验室/江苏省重点实验室/江苏大学农业工程研究院,江苏镇江212013 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《应用生态学报》2014年第9期2563-2568,共6页Chinese Journal of Applied Ecology

基　　金："十二五"国家科技支撑计划项目(2009BADB2B04-03)资助

摘　　要：福建泉州湾红树林湿地生态系统所处地属正规半日潮,为新近栽植的人工修复林带.采用Li-840便携式土壤二氧化碳分析仪测定主要红树群落土壤CO2排放通量,研究土壤CO2通量周期性变化特征.结果表明： 泉州湾红树林处于幼林期,其土壤CO2通量较小;早、晚潮潮间期,秋茄和桐花树群落土壤CO2浓度和通量随退潮时间变化趋势基本一致;泉州湾红树林湿地土壤CO2浓度和通量分别为557.08-2211.50 μmol·mol-1和-0.21-0.40μmol·m-2·s-1,早、晚潮潮间期和晚、早潮潮间期CO2通量平均值分别为0.26和-0.01μmol·m-2·s-1;对于同一退潮时刻,早、晚潮潮间期CO2通量大于晚、早潮潮间期.早、晚潮潮间期CO2通量与对应的即时CO2浓度呈“钟”型变化,CO2通量随CO2浓度的增加呈先增加后降低的趋势,近似高斯分布,据此可建立该系统土壤CO2通量与CO2即时浓度的数学模型.Mangrove wetland ecosystem in Quanzhou Bay in Fujian Province is newly restored with a regular semidiurnal tide. Soil CO2 concentration in the mangrove soil was determined by Li-840 portable gas analyzer, and periodic characteristics of soil CO2 emission was investigated. The soil CO2 flux in the wetland soil was relatively small because the mangrove was young. The change trends of soil CO2 concentration and flux with time were consistentin Kandelia obovate and Aegiceras corniculatum communities in the intertidal periods. The CO2 concentration and flux in the wetland soil were 557.08-2211.50 μmol·mol-1 and -0.21-0.40 μmol·m-2·s-1, respectively. The average CO2 flux in the wetland soil was 0.26 μmol·mol-1·s-1 in the intertidal of morning and evening tides （early intertidal） and -0.01 μmol·m-2·s-1 in the intertidal of evening and morning tides （late intertidal）, respectively. At the same time after the tide, the concentration and flux of CO2in the mangrove soil in early intertidal was higher than that in late intertidal. In early intertidal, the relationship between the flux and instantaneous concentration of CO2 in the wetland soil was expressed as a bellshaped curve, and CO2flux increased first and then decreased with the increa sing CO2 concentration, which was in conformity with Gaussian distribution.

关 键 词：红树林湿地 CO2通量 潮间期 秋茄桐花树 

分 类 号：S714[农业科学—林学]