DOI: 10.1007/s10533-017-0319-8
Scopus记录号: 2-s2.0-85015160373
论文题名: The role of hydrodynamic sorting on the accumulation and distribution of organic carbon in an impoundment: Englebright Lake, California, USA
作者: Pondell C.R. ; Canuel E.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 2 起始页码: 129
结束页码: 145
语种: 英语
英文关键词: Gilbert-type delta
; Impoundments
; Organic carbon accumulation
; Sediment accumulation
; stable carbon and nitrogen isotopes
Scopus关键词: anthropogenic effect
; carbon isotope
; deltaic deposit
; geoaccumulation
; hydrodynamics
; lacustrine deposit
; nitrogen isotope
; organic carbon
; sediment chemistry
; sorting
; spatial distribution
; stable isotope
; watershed
; California
; Englebright Reservoir
; United States
英文摘要: The global proliferation of dams is one of the most significant anthropogenic impacts on the environment, resulting in the trapping of massive loads of sediment and nutrients in impoundments. Few studies, however, have examined these impounded sediments to understand patterns of organic carbon (OC) accumulation and the effects of watershed processes on carbon delivery. This study measured total organic carbon (TOC) and stable isotopes of carbon and nitrogen (δ13C and δ15N) in Englebright Lake, CA to relate changes in OC sources and TOC accumulation to natural and anthropogenic events in the watershed and to depositional processes in the lake. Englebright Lake is a representative system for impoundments in small, mountainous rivers, and anthropogenic disturbances in the watershed caused high sediment accumulation rates in the lake. Throughout its 60-year history, 0.35 Tg OC has been trapped behind Englebright Dam and δ13C signatures indicate that more than 50% of the OC in Englebright Lake was derived from terrigenous sources. TOC content ranged from 0.03 to 30.24% of dry weight, and differed across depositional regimes; TOC content in topset deposits (0.35 ± 0.58%) was less than in foreset (2.64 ± 5.95%) and bottomset (1.51 ± 1.41%) deposits (p < 0.001) and TOC accumulation associated with flood events was higher (up to 231 kgOC m−2 year−1) than during non-event periods (0.2 to 39 kgOC m−2 year−1). TOC accumulation rates in Englebright Lake were up to an order of magnitude higher than previous estimates of OC burial in California impoundments. As the number and size of dams continues to expand worldwide, the storage of TOC in impoundments will likely add to the growing number of anthropogenic modifications to the global carbon cycle. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83283
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: Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA, United States
Recommended Citation:
Pondell C.R.,Canuel E.A.. The role of hydrodynamic sorting on the accumulation and distribution of organic carbon in an impoundment: Englebright Lake, California, USA[J]. Biogeochemistry,2017-01-01,133(2)