【摘 要】
：
底栖硅藻是红树林的一个重要组份,尤其在冬春季可能成片覆盖红树林地表,其优势属为Nitzschia,Coscinodiscus和Gyrosigma.本研究采用静态气闭箱法,测定春季九龙江口红树林
【机 构】
：
国家海洋局第三海洋研究所福建厦门361005国家海洋局第三海洋研究所福建厦门361005;滨海湿地生态系统教育部重点实验室厦门大学环境与生态学院福建厦门361102滨海湿地生态系统教育部重点实验室厦门
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底栖硅藻是红树林的一个重要组份,尤其在冬春季可能成片覆盖红树林地表,其优势属为Nitzschia,Coscinodiscus和Gyrosigma.本研究采用静态气闭箱法,测定春季九龙江口红树林和光滩地表-大气界面3种温室气体CO2、CH4和N2O的通量,以检验底栖藻类是否对温室气体通量产生影响.结果表明,林内和光滩地表藻类的覆盖对CH4和N2O通量没有显著影响；藻类覆盖对CO2通量的影响与光照有关.在暗箱测定时,藻类覆盖对CO2通量无显著作用；而在明箱测定时,有藻覆盖的地表CO2通量显著低于无藻覆盖的地表,且表现为负通量.本研究中,无藻覆盖时林内和光滩地表的CO2通量均为正值(即表现为从土壤向大气排放CO2的效应),分别为9.24和10.13 mmol m-2 d-1；当有藻类覆盖时,藻类对CO2的吸收量则分别达到14.53和26.27 mmol m-2 d-1.强于地表CO2的释放量,说明土壤表层藻类作用可使红树林土壤由CO2排放源转变为汇.
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