Sedimentary Environment and Carbon Sequestration in Coastal Wetland of the Yellow River Delta
The present study is based on sedimentologic observation of a 23.7 m deep core (ZK5) from the Yellow River Delta drilled in 2007 and on the related laboratory analysis data such as bulk density, total carbon (TC), organic carbon (Corg), Al and nutrients.Identifications of sediment characteristics, foraminifer species and stratigraphic structures suggest seven different sedimentary environments from ZK5 top to bottom, which reveal geologic evolutions of the coastal wetland.These seven sedimentary layers are dated by AMS 14C method, together with comprehensive analyses of the Yellow River course diversion, historical geography and sedimentary geology.The accretion rates of TC and Corg for the different sedimentary environments are consequently calculated using the determined ages.The results show that TC and Corg have good linear correlations with nutrients and sedimentation rates and the latter are main factors controlling accretion rates.The study results also indicate that although TC and Corg concentrations, respectively 9-20 mg/g and 1-4 mg/g, are low in the modem Yellow River Delta, accretion rates of Corg in the Delta are much higher than those of the worlds other wetlands with high Corg concentrations.Remarkably, shallow sea wetlands (such as deltaic fronts) has an accumulation rate of 2102 g/m2.a in Corg due to the Deltas high sedimentation rates (60 cm/a at the maximum).Thus, it can be asserted that the modem Yellow River Delta is a very good carbon sink.
Carbon Sequestration Coastal Wetland Yellow River Delta
YE Siyuan WEI Mengji DING Xigui
Key Laboratory of Coastal Wetland biogeosciences,China Geological Survey,Qingdao 266071 China;Qingda Qingdao University,Qingdao 266071,China;Key Laboratory of Marine Hydrocarbon Resources and Environme
国际会议
第十八届凯洛林国际地质学术研讨会(The 18th Kerulien International Conference on Geological)
石家庄
英文
808-818
2013-09-20（万方平台首次上网日期，不代表论文的发表时间）