DOI: 10.1007/s10533-017-0337-6
Scopus记录号: 2-s2.0-85019201180
论文题名: Association with pedogenic iron and aluminum: effects on soil organic carbon storage and stability in four temperate forest soils
作者: Porras R.C. ; Hicks Pries C.E. ; McFarlane K.J. ; Hanson P.J. ; Torn M.S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 3 起始页码: 333
结束页码: 345
语种: 英语
英文关键词: 14C
; Mineral-organic associations
; Selective chemical dissolution
; Soil carbon stabilization
; Soil fractionation
; Soil organic carbon
Scopus关键词: aluminum
; carbon sequestration
; concentration (composition)
; dissolution
; forest soil
; fractionation
; iron
; mineral
; organic carbon
; pedogenesis
; precipitation (chemistry)
; soil carbon
; soil stabilization
; temperate environment
; temperate forest
; turnover
英文摘要: Soil organic carbon (SOC) can be stabilized via association with iron (Fe) and aluminum (Al) minerals. Fe and Al can be strong predictors of SOC storage and turnover in soils with relatively high extractable metals content and moderately acidic to circumneutral pH. Here we test whether pedogenic Fe and Al influence SOC content and turnover in soils with low Fe and Al content and acidic pH. In soils from four sites spanning three soil orders, we quantified the amount of Fe and Al in operationally-defined poorly crystalline and organically-complexed phases using selective chemical dissolution applied to the soil fraction containing mineral-associated carbon. We evaluated the correlations of Fe and Al concentrations, mean annual precipitation (MAP), mean annual temperature (MAT), and pH with SOC content and 14C-based turnover times. We found that poorly crystalline Fe and Al content predicted SOC turnover times (p < 0.0001) consistent with findings of previous studies, while organically-complexed Fe and Al content was a better predictor of SOC concentration (p < 0.0001). Greater site-level MAP (p < 0.0001) and colder site-level MAT (p < 0.0001) were correlated with longer SOC turnover times but were not correlated with SOC content. Our results suggest that poorly crystalline Fe and Al effectively slow the turnover of SOC in these acidic soils, even when their combined content in the soil is less than 2% by mass. However, in the strongly acidic Spodosol, organo-metal complexes tended to be less stable resulting in a more actively cycling mineral-associated SOC pool. © 2017, Springer International Publishing Switzerland (outside the USA). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83273
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: Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, MS 74-316C, Berkeley, CA, United States; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, United States; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
Recommended Citation:
Porras R.C.,Hicks Pries C.E.,McFarlane K.J.,et al. Association with pedogenic iron and aluminum: effects on soil organic carbon storage and stability in four temperate forest soils[J]. Biogeochemistry,2017-01-01,133(3)