DOI: 10.1111/gcb.12924
论文题名: How organic carbon derived from multiple sources contributes to carbon sequestration processes in a shallow coastal system?
作者: Watanabe K. ; Kuwae T.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 7 起始页码: 2612
结束页码: 2623
语种: 英语
英文关键词: Blue carbon
; Carbon sequestration
; Estuary
; Organic carbon dynamics
; Phytoplankton
; Seagrass meadow
; Sediment
; Stable isotope
Scopus关键词: air-sea interaction
; carbon dioxide
; carbon sequestration
; coastal lagoon
; estuarine ecosystem
; organic carbon
; phytoplankton
; primary production
; seagrass meadow
; shallow water
; stable isotope
; Furen Lagoon
; Japan
英文摘要: Carbon captured by marine organisms helps sequester atmospheric CO2 , especially in shallow coastal ecosystems, where rates of primary production and burial of organic carbon (OC) from multiple sources are high. However, linkages between the dynamics of OC derived from multiple sources and carbon sequestration are poorly understood. We investigated the origin (terrestrial, phytobenthos derived, and phytoplankton derived) of particulate OC (POC) and dissolved OC (DOC) in the water column and sedimentary OC using elemental, isotopic, and optical signatures in Furen Lagoon, Japan. Based on these data analysis, we explored how OC from multiple sources contributes to sequestration via storage in sediments, water column sequestration, and air-sea CO2 exchanges, and analyzed how the contributions vary with salinity in a shallow seagrass meadow as well. The relative contribution of terrestrial POC in the water column decreased with increasing salinity, whereas autochthonous POC increased in the salinity range 10-30. Phytoplankton-derived POC dominated the water column POC (65-95%) within this salinity range; however, it was minor in the sediments (3-29%). In contrast, terrestrial and phytobenthos-derived POC were relatively minor contributors in the water column but were major contributors in the sediments (49-78% and 19-36%, respectively), indicating that terrestrial and phytobenthos-derived POC were selectively stored in the sediments. Autochthonous DOC, part of which can contribute to long-term carbon sequestration in the water column, accounted for >25% of the total water column DOC pool in the salinity range 15-30. Autochthonous OC production decreased the concentration of dissolved inorganic carbon in the water column and thereby contributed to atmospheric CO2 uptake, except in the low-salinity zone. Our results indicate that shallow coastal ecosystems function not only as transition zones between land and ocean but also as carbon sequestration filters. They function at different timescales, depending on the salinity, and OC sources. © 2015 The Authors. Global Change Biology published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61716
Appears in Collections: 影响、适应和脆弱性
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作者单位: Coastal and Estuarine Environment Research Group, Port and Airport Research Institute, 3-1-1 Nagase, Yokosuka, Japan
Recommended Citation:
Watanabe K.,Kuwae T.. How organic carbon derived from multiple sources contributes to carbon sequestration processes in a shallow coastal system?[J]. Global Change Biology,2015-01-01,21(7)