DOI: 10.1002/2014GB004979
Scopus记录号: 2-s2.0-85027917079
论文题名: Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows
作者: Miyajima T ; , Hori M ; , Hamaguchi M ; , Shimabukuro H ; , Adachi H ; , Yamano H ; , Nakaoka M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 4 起始页码: 397
结束页码: 415
语种: 英语
英文关键词: accretion rate
; blue carbon storage
; organic carbon
; seagrass meadow
; sediment
; stable carbon isotopes
Scopus关键词: accretion
; carbon sequestration
; coastal sediment
; geoaccumulation
; geographical distribution
; habitat type
; meadow
; organic carbon
; seagrass
; sediment chemistry
; sediment core
; Asia
; Posidonia oceanica
英文摘要: Organic carbon (OC) stored in the sediments of seagrass meadows has been considered a globally significant OC reservoir. However, the sparsity and regional bias of studies on long-term OC accumulation in coastal sediments have limited reliable estimation of the capacity of seagrass meadows as a global OC sink. We evaluated the amount and accumulation rate of OC in sediment of seagrass meadows and adjacent areas in East and Southeast Asia. In temperate sites, the average OC concentration in the top 30 cm of sediment was higher in seagrass meadows (780-1080 mmol g-1) than in sediments without seagrass cover (52-430 mmol g-1). The average OC in the top 30 cm of subtropical and tropical seagrass meadow sediments ranged from 140 to 440 mmol g-1. Carbon isotope mass balancing suggested that the contribution of seagrass-derived carbon to OC stored in sediments was often relatively minor (temperate: 10-40%; subtropical: 35-82%; tropical: 4-34%) and correlated to the habitat type, being particularly low in estuarine habitats. Stock of OC in the top meter of sediment of all the studied meadows ranged from 38 to 120 Mg ha-1. The sediment accumulation rates were estimated by radiocarbon dating of six selected cores (0.32-1.34 mm yr-1). The long-term OC accumulation rates calculated from the sediment accumulation rate and the top 30 cm average OC concentration for the seagrass meadows (24-101 kg ha-1 yr-1) were considerably lower than the OC accumulation rates previously reported for Mediterranean Posidonia oceanica meadows (580 kg ha-1 yr-1 on average). Current estimates for the global carbon sink capacity of seagrass meadows, which rely largely on Mediterranean studies, may be considerable overestimations. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77989
Appears in Collections: 气候变化事实与影响
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作者单位: Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Hatsukaichi, Japan; Geoact Co., Ltd., Kitami, Japan; National Institute for Environmental Studies, Tsukuba, Japan; Field Science Center for Northern Biosphere, Hokkaido University, Akkeshi, Japan
Recommended Citation:
Miyajima T,, Hori M,, Hamaguchi M,et al. Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows[J]. Global Biogeochemical Cycles,2015-01-01,29(4)