DOI: 10.1007/s10533-016-0226-4
Scopus记录号: 2-s2.0-84979987668
论文题名: Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer
作者: Cooper K.J. ; Whitaker F.F. ; Anesio A.M. ; Naish M. ; Reynolds D.M. ; Evans E.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 129, 期: 2018-01-02 起始页码: 215
结束页码: 234
语种: 英语
英文关键词: Carbonate
; Dissolved organic carbon
; Fluorescence EEM
; Heterotrophic respiration
; Karstification
; Recharge waters
Scopus关键词: aquifer
; carbon dioxide
; carbonate
; community response
; dissolution
; dissolved organic carbon
; fluorescence
; groundwater
; heterotrophy
; karstification
; microbial community
; organic matter
; recharge
; shallow water
; stemflow
; transformation
; water table
英文摘要: In carbonate aquifers, dissolved organic carbon from the surface drives heterotrophic metabolism, generating CO2 in the subsurface. Although this has been a proposed mechanism for enhanced dissolution at the water table, respiration rates and their controlling factors have not been widely evaluated. This study investigates the composition and concentration of dissolved organic carbon (DOC) reaching the water table from different recharge pathways on a subtropical carbonate island using a combination of DOC concentration measurements, fluorescence and absorption characterisation. In addition, direct measurements of the microbial response to the differing water types were made. Interactions of rainfall with the vegetation, via throughfall and stemflow, increase the concentration of DOC. The highest DOC concentrations are associated with stemflow, overland recharge and dissolution hole waters which interact with bark lignin and exhibit strong terrestrial-derived characteristics. The groundwater samples exhibit the lowest concentrations of DOC and are comprised of refractory humic-like organic matter. The heterotrophic response seems to be controlled by the concentration of DOC in the sample. The terrestrially sourced humic-like matter in the stemflow and dissolution hole samples was highly labile, thus increasing the amount of biologically produced CO2 to drive dissolution. Based on the calculated respiration rates, microbial activity could enhance carbonate dissolution, increasing porosity generation by a maximum of 1 % kyr−1 at the top of the freshwater lens. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83375
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: School of Earth Sciences, University of Bristol, Bristol, United Kingdom; School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Centre for Research in Biosciences, University of the West of England, Bristol, United Kingdom
Recommended Citation:
Cooper K.J.,Whitaker F.F.,Anesio A.M.,et al. Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer[J]. Biogeochemistry,2016-01-01,129(2018-01-02)