气候变化领域集成服务门户(CCPortal): Landscape Age as a Major Control on the Geography of Soil Weathering

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DOI	10.1029/2019GB006266
	Landscape Age as a Major Control on the Geography of Soil Weathering
	Slessarev E.W.; Feng X.; Bingham N.L.; Chadwick O.A.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1513
结束页码	1531
卷号	33 期号:12
英文摘要	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.
英文关键词	Pedogenesis; Rock-derived nutrients; Weathering
语种	英语
scopus关键词	humid environment; Last Glacial Maximum; nutrient availability; pedogenesis; soil fertility; soil nutrient; weathering profile; United States
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129692
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
推荐引用方式 GB/T 7714	Slessarev E.W.,Feng X.,Bingham N.L.,et al. Landscape Age as a Major Control on the Geography of Soil Weathering[J],2019,33(12).
APA	Slessarev E.W.,Feng X.,Bingham N.L.,&Chadwick O.A..(2019).Landscape Age as a Major Control on the Geography of Soil Weathering.Global Biogeochemical Cycles,33(12).
MLA	Slessarev E.W.,et al."Landscape Age as a Major Control on the Geography of Soil Weathering".Global Biogeochemical Cycles 33.12(2019).