DOI: 10.1007/s10533-014-0035-6
Scopus记录号: 2-s2.0-84917727281
论文题名: Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA
作者: Jin J. ; Zimmerman A.R. ; Martin J.B. ; Khadka M.B.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期: 1 起始页码: 131
结束页码: 150
语种: 英语
英文关键词: Biogeochemical processes
; Carbon cycling
; Dissolved inorganic carbon
; Dissolved organic carbon
; Hydrologic mixing model
; Karst
Scopus关键词: baseflow
; biogeochemical cycle
; carbon cycle
; concentration (composition)
; dissolution
; karst hydrology
; mineralization
; riparian zone
; soil water
; spatiotemporal analysis
; watershed
; Florida [United States]
; Santa Fe River [Florida]
; United States
; United States
英文摘要: To understand role of biogeochemical reactions in controlling the amount and molecular form of dissolved carbon exported from carbonate terrains, spatiotemporal variations in dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) were observed over one year in the Santa Fe River system, a period of base flow or below. A water mixing model developed using concentrations of Na+,Cl−,and SO4 −2identified three major water sources: soil water, groundwater and deep aquifer water. After accounting for mixing of these water sources, additional chemical signatures resulting from biogeochemical processes in the riparian zone were identified. Net mineralization of DOC occurred throughout the Santa Fe River watershed, particularly during the lowest flow conditions and in the upper watershed. However, natural dissolved organic matter was more labile during low flow and in the lower watershed, and predominantly derived from groundwater (rather than soil water) in all samples, likely via releases during carbonate dissolution. Carbonate dissolution commonly occurred in the upper watershed during low flow conditions, while carbonate minerals precipitated during baseflow, as well as in the lower watershed during very low flow conditions. Thus, riparian zone biogeochemical processes were strongly mediated by watershed hydrology, whose spatiotemporal variations resulted in greater inorganic and organic C export production in the lower watershed than the upper watershed, and during higher flow versus lower flow periods. During this lower flow period, the Santa Fe River watershed exported ~1.0 and 10.3 ton km−2year−1DOC and DIC, respectively, representing higher C yields than many other types of watersheds. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83563
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: Department of Geological Sciences, University of Florida, 241 Williamson Hall, P.O. Box 112120, Gainesville, FL, United States
Recommended Citation:
Jin J.,Zimmerman A.R.,Martin J.B.,et al. Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA[J]. Biogeochemistry,2015-01-01,122(1)