| 河口盐度梯度下短叶茳芏沼泽湿地土壤间隙水溶解性甲烷时空特征 |
| 摘要点击 2089 全文点击 1171 投稿时间：2015-04-06 修订日期：2015-05-13 |
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| 中文关键词 间隙水 溶解性CH4 时空特征 盐度梯度 短叶茳芏沼泽湿地 闽江口 |
| 英文关键词 porewater dissolved methane spatial-temporal characteristics salinity gradient Cyperus malaccensis marsh Minjiang River estuary |
| 作者 | 单位 | E-mail | | 杨平 | 福建师范大学地理科学学院, 福州 350007
福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007 | yangping528@sina.cn | | 张子川 | 福建师范大学地理科学学院, 福州 350007 | | | 杜威宁 | 福建师范大学地理科学学院, 福州 350007 | | | 黄佳芳 | 福建师范大学地理研究所, 福州 350007
福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007
福建师范大学亚热带湿地研究中心, 福州 350007 | | | 仝川 | 福建师范大学地理研究所, 福州 350007
福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007
福建师范大学亚热带湿地研究中心, 福州 350007 | tongch@finu.edu.cn |
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| 中文摘要 |
| 以闽江口短叶茳芏沼泽湿地为研究对象,沿半咸水至淡水的盐度梯度采集土壤样品,测定分析样品间隙水溶解性CH4浓度及其主要理化指标,探讨了河口沼泽湿地间隙水溶解性CH4浓度的时空特征及其影响因子. 结果表明: ①夏季鳝鱼滩、蝙蝠洲和下洋洲湿地间隙水CH4浓度均值分别为331.18、299.94和638.58 μmol·L-1,冬季均值分别为9.04、266.67和322.68 μmol·L-1,呈现夏季显著高于冬季的时间动态特征(P<0.05);②沿半咸水至淡水的盐度梯度,间隙水溶解性CH4浓度呈现递增的空间分布特征;③土壤间隙水CH4浓度与土温、DOC呈显著正相关关系,与土壤pH、盐分和间隙水SO42-、Cl-浓度呈显著(P<0.05)或极显著负相关关系(P<0.01),河口盐度梯度下短叶茳芏沼泽湿地间隙水CH4浓度时空特征是土壤理化性质和潮汐等综合作用的结果. |
| 英文摘要 |
| Physicochemical properties of soil and dissolved methane concentrations of porewater in the sediments of the Cyperus malaccensis marshes along a salinity gradient in the Minjiang River estuary were evaluated, and the spatial-temporal characteristics and main impact factors were discussed.The average concentrations of dissolved methane in porewater were 331.18, 299.94 and 638.58 μmol·L-1, respectively in the Shanyutan, Bianfuzhou and Xiayangzhou wetlands in summer.In the winter, they were 9.04, 266.67 and 322.68 μmol·L-1, respectively.The dissolved methane concentration in porewater was higher in summer than those in winter (P<0.05).Overall, the concentrations of dissolved methane in porewater showed an increasing trend from brackish to freshwater marshes.Multivariate statistics analysis showed that the concentrations of dissolved methane in porewater was positively correlated with soils temperature and DOC (P<0.05), but negatively correlated with soils pH, salinity, and the concentrations of porewater SO42- and Cl-.Spatial-temporal distribution of porewater dissolved methane in estuarine marshes represents a final result of multiple factors, including soil physicochemical properties and hydrodynamic condition. |
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