DOI: 10.1007/s10533-015-0134-z
Scopus记录号: 2-s2.0-84944154202
论文题名: Dissolved organic carbon concentration and flux in a grassland stream: spatial and temporal patterns and processes from long-term data
作者: Rüegg J. ; Eichmiller J.J. ; Mladenov N. ; Dodds W.K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 3 起始页码: 393
结束页码: 408
语种: 英语
英文关键词: Carbon cycle
; Carbon export
; Long-term study
; Prairie streams
Scopus关键词: autotrophy
; biogeochemistry
; biome
; carbon cycle
; carbon flux
; concentration (composition)
; data set
; dissolved organic carbon
; grassland
; organic matter
; precipitation (chemistry)
; runoff
; spatiotemporal analysis
; terrestrial environment
; watershed
; Kansas
; Kings Creek
; Konza Prairie
; United States
; Bison
英文摘要: Dissolved organic carbon (DOC) in streams is a critical component of the global carbon cycle, but little is known about long-term patterns in DOC concentration and export in grassland streams. Here we present the results of a 15-year dataset collected from multiple sites in the Kings Creek watershed on Konza Prairie, KS, USA. DOC concentrations ranged from 0.15 to 15.97 mg L−1, with a mean of 1.19 mg L−1 (standard deviation 1.01 mg L−1). Sites differed in their DOC concentrations as a function of the year of study and the season. Generally, headwaters had greater DOC concentrations, and DOC decreased downstream. The lowest concentrations were found in a groundwater spring in the watershed. Concentrations showed no trend over the study and were not correlated with discharge. However, annual export (mean: 0.29 kg ha−1 year−1; range: 0.00–9.09 kg ha−1 year−1) was highly correlated with annual runoff, and annual runoff explained over 80 % of the variation in export. Export from Kings Creek was 30 times lower than the literature-reported mean for grasslands and 137 times less than export averaged across all biomes. Neither fire nor bison, two forces that maintain prairies, were statistically related to DOC concentrations. Main drivers of DOC concentrations are likely leaching from terrestrial organic material in soils and the accumulations in dry streambeds during drought periods as well as instream autotrophic production. Downstream declines in DOC concentrations suggest instream processing. Grassland streams probably have modest effects on the global carbon budget due to instream processing and low precipitation. Changes in precipitation may have large effects on carbon export from grassland streams. © 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/83474
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: Division of Biology, Kansas State University, Manhattan, KS, United States; Department of Fisheries, Wildlife, and Conservation Biology, University of Minnesota Twin Cities, Saint Paul, MN, United States; Department of Civil Construction and Environmental Engineering, San Diego State University, San Diego, CA, United States
Recommended Citation:
Rüegg J.,Eichmiller J.J.,Mladenov N.,et al. Dissolved organic carbon concentration and flux in a grassland stream: spatial and temporal patterns and processes from long-term data[J]. Biogeochemistry,2015-01-01,125(3)