| DOI: | 10.1002/2013GB004631
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| Scopus记录号: | 2-s2.0-84887264017
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| 论文题名: | Quantity and quality of organic matter (detritus) drives N2 effluxes (net denitrification) across seasons, benthic habitats, and estuaries |
| 作者: | Eyre B; D; , Maher D; T; , Squire P
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| 刊名: | Global Biogeochemical Cycles
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| ISSN: | 8866236
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| 出版年: | 2013
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| 卷: | 27, 期:4 | | 起始页码: | 1083
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| 结束页码: | 1095
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| 语种: | 英语
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| 英文关键词: | denitrification
; detritus
; mangroves
; organic matter
; seagrass
; stable isotopes
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| Scopus关键词: | Benthic habitats
; Coastal systems
; detritus
; mangroves
; Seagrasses
; Sediment organic matters
; Sediment oxygen demand
; Stable isotopes
; Biogeochemistry
; Biological materials
; Denitrification
; Ecosystems
; Isotopes
; Mixtures
; Organic compounds
; Plants (botany)
; Quality control
; Sediments
; Estuaries
; benthos
; coastal zone
; denitrification
; diel variation
; dominance
; estuarine ecosystem
; global change
; habitat type
; nitrogen cycle
; nutrient loss
; organic matter
; seasonal variation
; Australia
; algae
; Rhizophoraceae
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| 英文摘要: | N2 flux rates (net denitrification) were measured over a diel cycle, seasonally, in 12 benthic habitats across three warm temperate Australian coastal systems. Dark N2-N fluxes were strongly controlled by sediment oxygen demand (SOD) across the 3 estuaries, 4 seasons, and 12 benthic habitats (r2 = 0.743; p < 0.001; n = 142; slope = 0.0170). However, some of the slopes differed significantly between seasons and among estuaries and habitats, and all of the slopes were correlated with the δ13C values and C:N ratios of sediment organic matter. Ternary mixing diagrams with the contribution of algal, seagrass, and terrestrial/mangrove material to sediment organic matter showed that habitats, seasons, and estuaries dominated by a mixture of seagrass and algal material had the lowest slopes, and slopes increase as habitats, seasons, and estuaries have an increasing contribution from terrestrial/ mangrove material. Overall, the slopes of dark N2 fluxes versus SOD were low compared to previous studies, most likely due to either, or a combination of, the C:N ratio of the organic matter, the mixture of C:N ratios making up the organic matter, the structure of the organic matter, and/or the SOD rates. This study demonstrated that it is not only the quantity but also the type (quality), and maybe the mixture, of organic matter that is an important control on denitrification. As such, rapid global changes to detrital sources to coastal systems due to losses of mangrove, seagrasses, and saltmarshes, and associated increases in algae and macrophytes, are also expected to impact system level losses of nitrogen via denitrification. Key Points OM effect on denitrification in coastal systems mostly focused on quantity Quantity and quality of OM is an important control on denitrification Global changes to detrital sources may impact N loss via denitrification ©2013. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/77559
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Centre for Coastal Biogeochemistry, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia
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| Recommended Citation: | |
Eyre B,D,, Maher D,et al. Quantity and quality of organic matter (detritus) drives N2 effluxes (net denitrification) across seasons, benthic habitats, and estuaries[J]. Global Biogeochemical Cycles,2013-01-01,27(4)
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