DOI: 10.1007/s10533-015-0094-3
Scopus记录号: 2-s2.0-84930274473
论文题名: After the flood: changing dissolved organic carbon bioavailability and bacterial growth following inflows to estuaries
作者: Hitchcock J.N. ; Mitrovic S.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 219
结束页码: 233
语种: 英语
英文关键词: Bacteria
; Bioavailability
; Carbon
; Estuary
; Flood
; River
Scopus关键词: bacterium
; bioassay
; bioavailability
; discharge
; dissolved organic carbon
; estuarine dynamics
; freshwater input
; inflow
; nitrogen
; nutrient limitation
; phosphorus
; temperate environment
; Australia
; Bega Estuary
; Clyde Estuary
; Clyde River [Scotland]
; Scotland
; United Kingdom
; Bacteria (microorganisms)
英文摘要: Freshwater inflows play an important role in delivering dissolved organic carbon (DOC) to estuaries. Although considerable DOC can be delivered to estuaries during episodic inflow events, such as floods, little information exists on how the bioavailability of DOC may change during these periods. In this study we used in vitro bioassay incubation experiments to examine how bioavailability changed following inflow events in two temperate south east Australian estuaries; the agricultural Bega River and the forested Clyde River. We measured short-term (2 days) and long-term (28 days) bioavailable DOC (BDOC) and determined percentage bioavailability, bacterial doubling times (BTd), all with and without excess nitrogen and phosphorus to control for nutrient limitation. Our results showed BDOC varied between 0.13 and 3.62 mg C L−1, equivalent to 2.5–31 % of initial concentrations. BTd were significantly shorter at the peak of flow and reduced as discharge returned to base flow conditions. Multiple-regression analysis showed discharge and specific ultraviolet light absorbance were the best factors for explaining variance in BDOC whilst discharge was the best factor for explaining BTd. The addition of nutrients led to significantly higher measurements of BDOC and bacteria doubling times on the Clyde River when initial phosphorus concentrations were low. These results highlight the importance of freshwater inflow events as intense moments of biogeochemical transformation in estuaries. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83506
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: Centre for Environmental Sustainability, School of the Environment, University of Technology, Sydney, PO Box 123, Broadway, NSW, Australia; New South Wales Office of Water, Elizabeth Macarthur Agricultural Institute, Private Bag 4008, Narellan, NSW, Australia
Recommended Citation:
Hitchcock J.N.,Mitrovic S.M.. After the flood: changing dissolved organic carbon bioavailability and bacterial growth following inflows to estuaries[J]. Biogeochemistry,2015-01-01,124(2018-01-03)