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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.
Studying the diurnal dynamics of water-soluble CO 2 and CH 4 concentrations in soil interspaces of estuarine swamp wetlands plays an important role in revealing the carbon cycle of estuarine wetlands. From April 4 to April 5 and September 2 to 3 (January 1, 2010) and From April 14 to September 15 and September 9 to September 10 (tide day), Cyperus malaccensis + Phragmites australis swamp wetlands were distributed in the mid-high tide transitional zone of the central part of the eel beach in the Min River estuary. Soil water solubility CO 2 and CH 4 concentrations were monitored continuously for 24 h and the parameters of in situ soil temperature, conductivity and NH + 4-N were measured synchronously.The results showed that soil interstitial water The daily range of CH_4 concentration ranged from 88.20 ~ 190.74, 53.42 ~ 141.24, 16.27 ~ 81.89 and 44.90 ~ 88.53μmol·L -1, respectively. (P> 0.05), while the daily diurnal variation trend was opposite in September and January (P <0.05). The diurnal variation range of water-soluble CO_2 concentration in the soil gap was 29.33 ~ 40.1μmol·L ~ (-1) and 9.69 ~ 29.96μmol·L ~ (-1), respectively, showing the characteristics of daytime and nighttime high (P <0.01) Soil dissolved water CO 2 concentration was lower than before tide and before ebb tide, and the soil water solubility CH 4 during tide was higher than before tide and after ebb tide.