DOI: 10.1029/2019GB006266
论文题名: Landscape Age as a Major Control on the Geography of Soil Weathering
作者: Slessarev E.W. ; Feng X. ; Bingham N.L. ; Chadwick O.A.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 12 语种: 英语
英文关键词: humid environment
; Last Glacial Maximum
; nutrient availability
; pedogenesis
; soil fertility
; soil nutrient
; weathering profile
; United States
学科: Pedogenesis
; Rock-derived nutrients
; Weathering
中文摘要: Global-scale models of rock-derived nutrient availability often assume that physical erosion drives soils toward an approximate “steady state” over geologic timescales. By definition, steady-state models do not represent landscape age—that is, the time elapsed since soil formation is initiated by major erosional or depositional events. We hypothesize that this steady-state assumption has large consequences on estimates of soil fertility because landscape age can mediate the retention of mobile elements in soil, particularly in low-relief landscapes and humid climates. We quantified the effect of landscape age on soil fertility by estimating Na retention in soils across the United States and explicitly resolving landscape age in regions that experienced significant deposition or glacial retreat after the Last Glacial Maximum (LGM). We then used a simple one-compartment model to simulate soil formation and weathering, comparing predictions that incorporated landscape age with those based on the steady-state assumption. We found that soils formed in LGM deposits in low-relief, humid settings generally retain 10 times more Na than soils formed outside of LGM deposits. Furthermore, the model that accounted for landscape age outperformed a steady-state model across the United States and increased globally averaged estimates of Na retention by 17%. These results reinforce the idea that landscape age is a major control on weathering and should not be ignored in simulations of nutrient cycling. ©2019. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160087
Appears in Collections: 气候变化与战略
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作者单位: Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Minneapolis, MN, United States; Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, United States; Department of Land, Air, and Water Resources, University of California, Davis, CA, United States; Department of Geography, University of California, Santa Barbara, CA, United States
Recommended Citation:
Slessarev E.W.,Feng X.,Bingham N.L.,et al. Landscape Age as a Major Control on the Geography of Soil Weathering[J]. Global Biogeochemical Cycles,2019-01-01,33(12)