갯벌 메탄가스 플럭스 측정에 대한 저서생물 서식굴의 영향

Abstract

Estimating the methane (CH4) emission from sediments toward the ocean-atmosphere system is important considerations in both geological and climate sciences. Nevertheless, global estimates of methane inventories and rates of methane production and consumption through anaerobic oxidation in marine sediments are poorly constrained. A closed-chamber method has being widely used in biogeochemical studies of marine sediments, but it is not known the effects of benthic faunal burrow opening on chamber measurements of methane flux in intertidal sediments. The results presented here showed that a negative methane flux (i.e. consumption of CH4) was measured in the water filling burrows of Macrophthalmus japonicus, as compared to unburrowed controls showing a positive methane flux (i.e. production of CH4). We investigated also enhanced dissolved methane concentrations in the water of burrows, indicating methane deposition during chamber measurements. This study suggests that benthic faunal burrows could be considered for an accurate interpretation of spatial heterogeneity in sediment-air methane flux measured using chamber method.on and consumption through anaerobic oxidation in marine sediments are poorly constrained. A closed-chamber method has being widely used in biogeochemical studies of marine sediments, but it is not known the effects of benthic faunal burrow opening on chamber measurements of methane flux in intertidal sediments. The results presented here showed that a negative methane flux (i.e. consumption of CH4) was measured in the water filling burrows of Macrophthalmus japonicus, as compared to unburrowed controls showing a positive methane flux (i.e. production of CH4). We investigated also enhanced dissolved methane concentrations in the water of burrows, indicating methane deposition during chamber measurements. This study suggests that benthic faunal burrows could be considered for an accurate interpretation of spatial heterogeneity in sediment-air methane flux measured using chamber method.