闽江口短叶茳芏+芦苇沼泽湿地大、小潮日土壤间隙水溶解性CH_4与CO_2浓度日动态  

Diurnal Variations of Concentration of Porewater Dissolved CH_4 and CO_2 in a Brackish Marsh Dominated by Cyperus malaccensis and Phragmites australis During Neap and Spring Tidal Days in the Minjiang River Estuary

作　　者：谭立山 杨平[1,2] 何露露[1] 黄佳芳[1,2,3] 胡智强[1] 仝川[1,2,3] TAN Li-shan YANG Ping HE Lu-lu HUANG Jia-fang HU Zhi-qiang TONG Chuan(School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fuzhou 350007, China Research Centre of Wetlands in Subtropical Region, Fujian Normal University, Fuzhou 350007, China)

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]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 [3]福建师范大学亚热带湿地研究中心,福州350007

出　　处：《环境科学》2017年第1期52-59,共8页Environmental Science

基　　金：福建省基本科研专项重点项目(2014R1034-1);国家自然科学基金项目(41371127);福建师范大学校级创新团队项目(IRTL1205);福建师范大学地理科学学院研究生科研创新项目(GY201601)

摘　　要：研究河口感潮沼泽湿地土壤间隙水溶解性CO_2和CH_4浓度日动态对于揭示河口湿地碳循环过程具有重要作用.于2010年的4月4~5日和9月2~3日(小潮日)和4月14~15日和9月9~10日(大潮日),对闽江河口鳝鱼滩中部中高潮滩过渡区分布的短叶茳芏(Cyperus malaccensis)+芦苇(Phragmites australis)沼泽湿地的土壤间隙水溶解性CO_2和CH_4浓度进行24 h连续监测,并同步测定了原位土壤温度、电导率及NH+4-N等参数.结果表明:14月与9月大、小潮日土壤间隙水溶解性CH_4浓度日变化范围分别介于88.20~190.74、53.42~141.24、16.27~81.89和44.90~88.53μmol·L^(-1),其中4月大、小潮日土壤间隙水溶解性CH_4浓度均呈现昼低夜高特征(P>0.05),而9月大、小潮日呈现相反的日变化趋势(P<0.05);29月大、小潮日土壤间隙水溶解性CO_2浓度日变化范围分别介于19.33~40.1μmol·L^(-1)和9.69~29.96μmol·L^(-1),均呈现昼低夜高特征(P<0.01);3涨潮期间土壤间隙水溶解性CO_2浓度均要低于涨潮前与落潮后,而涨潮期间土壤间隙水溶解性CH_4浓度高于涨潮前和落潮后.Understanding of diurnal variation of soil porewater dissolved CO2 and CH4concentration plays an important role in revealing carbon cycling in estuarine wetlands. During neap and spring tidal days in April and September 2010,the diurnal variations of soil porewater dissolved CO2 and CH4concentrations and main impacting factors in a brackish marsh ecosystem dominated by two species of Cyperus malaccensis（ brevifolius） and Phragmites australis（ common reed） were determined in the Shan Yutan in the Min River estuary,southeast China. The results showed that： 1 the soil porewater dissolved CH4 concentration during the spring and neap tidal days in April and September ranged from 88. 20 to 190. 74,53. 42 to 141. 24,16. 27 to 81. 89 and 44. 90 to 88. 53 μmol·L^-1,respectively. The mean of dissolved CH4 concentration was higher at nighttime than at daytime during the spring and neap tidal days in April,but the mean of dissolved CH4 concentration was higher at daytime than at nighttime during the spring and neap tidal tidal days in September. 2 the soil porewater dissolved CO2 concentration during the spring and neap tidal days in September ranged from 19. 33 to 40. 1 μmol·L^-1and 9. 69 to 29. 96 μmol·L^-1,respectively,and the dissolved CO2 concentration during daytime was lower than that at night; 3 the mean of dissolved CO2 concentration was lower during the inundation period than in the exposed soil surface period,but the mean of dissolved CH4 concentration was higher during the inundation period than in the exposed soil surface period.

关 键 词：间隙水 溶解性CH4 溶解性CO2 大、小潮日 日变化 河口湿地 

分 类 号：X144[环境科学与工程—环境科学] X16