DOI: 10.1007/s10533-018-0427-0
Scopus记录号: 2-s2.0-85041806156
论文题名: Faster redox fluctuations can lead to higher iron reduction rates in humid forest soils
作者: Barcellos D. ; Cyle K.T. ; Thompson A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 3 起始页码: 367
结束页码: 378
语种: 英语
英文关键词: Carbon
; Iron
; Redox oscillations
; Tropical forest soil
Scopus关键词: carbon cycle
; forest soil
; humid environment
; iron
; nutrient dynamics
; oxidation
; redox conditions
; reduction
; tropical forest
; Puerto Rico
英文摘要: Iron (Fe) minerals play an important role in carbon (C) and nutrient dynamics in redox fluctuating soils. We explored how the frequency of redox oscillations influence Fe reduction rates and C content in Puerto Rican soils. We hypothesized that iron reduction rates would be faster during short oscillation periods than in longer oscillation periods. Surface soils from an upland valley in a humid tropical forest were exposed to systematic redox oscillations over 49 days. The oxidation events were triggered by the introduction of air (21% O2), maintaining the time ratio under oxic or anoxic conditions at 1:6 (τox/τanox). After pre-conditioning the soil to fluctuating redox conditions for 1 month, we imposed 280- and 70-h (or 11.67- and 2.5-day) redox oscillations, measuring FeII every few days. We found that by the end of the experiment, Fe reduction rates were higher in the short oscillation period (τox = 10 h, τanox = 60 h) than in the long oscillation period (τox = 40 h, τanox = 240 h). Carbon and nitrogen loss however was similar for both treatments. These results suggest the characteristics of redox fluctuations can alter rates of Fe reduction and potentially influence ecosystem processes that depend on iron behavior. © 2018, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83184
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 Crop and Soil Sciences, University of Georgia, Athens, GA, United States; Soil and Crop Sciences, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
Recommended Citation:
Barcellos D.,Cyle K.T.,Thompson A.. Faster redox fluctuations can lead to higher iron reduction rates in humid forest soils[J]. Biogeochemistry,2018-01-01,137(3)