DOI: 10.1002/2014GB004872
Scopus记录号: 2-s2.0-84927625040
论文题名: Influence of water depth on the carbon sequestration capacity of seagrasses
作者: Serrano O ; , Lavery P ; S ; , Rozaimi M ; , Mateo M ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 9 起始页码: 950
结束页码: 961
语种: 英语
英文关键词: blue carbon
; carbon sinks
; climate Change
; coastal ecosystems
; Posidonia
Scopus关键词: acclimation
; accretion
; biogeochemistry
; carbon sequestration
; carbon sink
; climate change
; environmental factor
; irradiance
; light availability
; organic carbon
; seagrass
; water depth
; Balearic Islands
; Mediterranean Sea
; Spain
; Spain
; Posidonia
; Posidonia oceanica
; Posidonia sinuosa
英文摘要: The actual estimates of carbon stocks beneath seagrass meadows worldwide are derived from few data, resulting in a tendency to generalize global carbon stocks from a very limited number of seagrass habitats. We surveyed Posidonia oceanica and Posidonia sinuosa meadows along depth-induced gradients of light availability to assess the variability in their sedimentary organic carbon (Corg ) stocks and accretion rates. This study showed a fourfold decrease in Corg stocks from 2-4 m to 6-8 m depth P. sinuosa meadows (averaging 7.0 and 1.8 kg m-2, respectively; top meter of sediment) and a fourteenfold to sixteenfold decrease from shallow (2 m) to deep (32 m) P. oceanica meadows (200 and 19 kg m-2 average, respectively; top 2.7 m of sediment). The average Corg accretion rates in shallow P. sinuosa meadows were higher (10.5 g m-2 yr-1) than in deeper meadows (2.1 g m-2 yr-1). The reduction of sedimentary Corg stocks and accretion rates along depth-related gradients of light reduction suggests that irradiance, controlling plant productivity, meadow density, and sediment accretion rates, is a key environmental factor affecting Corg storage potential of seagrasses. The results obtained highlighted the exceptional carbon storage capacity of P. oceanica meadows at Balearic Islands (Spain), containing the highest areal Corg stocks of all seagrasses (estimated in up to 691-770 kg m-2 in 8-13 m thick deposits). Seagrass communities are experiencing worldwide decline, and reduced irradiance (following e.g., eutrophication or sediment regime alterations) will lead to photoacclimation responses (i.e., reduced plant productivity and shoot density), which may impact the carbon sequestration capacity of seagrasses. ©2014. 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/77456
Appears in Collections: 气候变化事实与影响
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作者单位: School of Natural Sciences, Centre for Marine Ecosystems Research, Edith Cowan University, Perth, WA, Australia; University of Western Australia Oceans Institute, University of Western Australia, Perth, WA, Australia; School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Malaysia; Centro de Estudios Avanzados de Blanes, Consejo Superior de Investigaciones Científicas, Girona, Spain
Recommended Citation:
Serrano O,, Lavery P,S,et al. Influence of water depth on the carbon sequestration capacity of seagrasses[J]. Global Biogeochemical Cycles,2014-01-01,28(9)