DOI: 10.1002/2017JG004336
Scopus记录号: 2-s2.0-85045518028
论文题名: Constraining Marsh Carbon Budgets Using Long-Term C Burial and Contemporary Atmospheric CO2 Fluxes
作者: Forbrich I. ; Giblin A.E. ; Hopkinson C.S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 3 起始页码: 867
结束页码: 878
语种: 英语
英文关键词: burial rate
; carbon budget
; eddy covariance
; interannual variation
; salinity
; salt marsh
Scopus关键词: annual variation
; atmosphere-biosphere interaction
; burial diagenesis
; carbon balance
; carbon flux
; carbon sequestration
; climate variation
; eddy covariance
; environmental change
; long-term change
; marsh
; NDVI
; net ecosystem exchange
; radiometric method
; salinity
; saltmarsh
英文摘要: Salt marshes are sinks for atmospheric carbon dioxide that respond to environmental changes related to sea level rise and climate. Here we assess how climatic variations affect marsh-atmosphere exchange of carbon dioxide in the short term and compare it to long-term burial rates based on radiometric dating. The 5 years of atmospheric measurements show a strong interannual variation in atmospheric carbon exchange, varying from −104 to −233 g C m−2 a−1 with a mean of −179 ± 32 g C m−2 a−1. Variation in these annual sums was best explained by differences in rainfall early in the growing season. In the two years with below average rainfall in June, both net uptake and Normalized Difference Vegetation Index were less than in the other three years. Measurements in 2016 and 2017 suggest that the mechanism behind this variability may be rainfall decreasing soil salinity which has been shown to strongly control productivity. The net ecosystem carbon balance was determined as burial rate from four sediment cores using radiometric dating and was lower than the net uptake measured by eddy covariance (mean: 110 ± 13 g C m−2 a−1). The difference between these estimates was significant and may be because the atmospheric measurements do not capture lateral carbon fluxes due to tidal exchange. Overall, it was smaller than values reported in the literature for lateral fluxes and highlights the importance of investigating lateral C fluxes in future studies. ©2018. 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/114296
Appears in Collections: 气候减缓与适应
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作者单位: Marine Biological Laboratory, Woods Hole, MA, United States; Department of Marine Sciences, University of Georgia, Athens, GA, United States
Recommended Citation:
Forbrich I.,Giblin A.E.,Hopkinson C.S.. Constraining Marsh Carbon Budgets Using Long-Term C Burial and Contemporary Atmospheric CO2 Fluxes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(3)