气候变化领域集成服务门户(CCPortal): Depth-dependent soil mixing persists across climate zones

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DOI	10.1073/pnas.1914140117
	Depth-dependent soil mixing persists across climate zones
	Gray H.J.; Keen-Zebert A.; Furbish D.J.; Tucker G.E.; Mahan S.A.
发表日期	2020
ISSN	0027-8424
起始页码	8750
结束页码	8756
卷号	117 期号:16
英文摘要	Soil mixing over long (>102 y) timescales enhances nutrient fluxes that support soil ecology, contributes to dispersion of sediment and contaminated material, and modulates fluxes of carbon through Earth’s largest terrestrial carbon reservoir. Despite its foundational importance, we lack robust understanding of the rates and patterns of soil mixing, largely due to a lack of long-timescale data. Here we demonstrate that luminescence, a light-sensitive property of minerals used for geologic dating, can be used as a long-timescale sediment tracer in soils to reveal the structure of soil mixing. We develop a probabilistic model of transport and mixing of tracer particles and associated luminescence in soils and compare with a global compilation of luminescence versus depth in various locations. The model–data comparison reveals that soil mixing rate varies over the soil depth, with this depth dependency persisting across climate and ecological zones. The depth dependency is consistent with a model in which mixing intensity decreases linearly or exponentially with depth, although our data do not resolve between these cases. Our findings support the long-suspected idea that depth-dependent mixing is a spatially and temporally persistent feature of soils. Evidence for a climate control on the patterns and intensities of soil mixing with depth remains elusive and requires the further study of soil mixing processes. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Luminescence; OSL; Pedoturbation; Sediment tracing; Soil mixing
语种	英语
scopus关键词	Article; climate; controlled study; ecology; environmental factor; geology; luminescence; priority journal; sediment; soil analysis; soil and soil related phenomena; soil mixing
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160976
作者单位	Gray, H.J., Luminescence Geochronology Laboratory, US Geological Survey, Denver, CO 80225, United States; Keen-Zebert, A., Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV 89512, United States; Furbish, D.J., Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN 37235, United States, Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37325, United States; Tucker, G.E., Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado–Boulder, Boulder, CO 80309, United States, Department of Geological Sciences, University of Colorado–Boulder, Boulder, CO 80309, United States; Mahan, S.A., Luminescence Geochronology Laboratory, US Geological Survey, Denver, CO 80225, United States
推荐引用方式 GB/T 7714	Gray H.J.,Keen-Zebert A.,Furbish D.J.,et al. Depth-dependent soil mixing persists across climate zones[J],2020,117(16).
APA	Gray H.J.,Keen-Zebert A.,Furbish D.J.,Tucker G.E.,&Mahan S.A..(2020).Depth-dependent soil mixing persists across climate zones.Proceedings of the National Academy of Sciences of the United States of America,117(16).
MLA	Gray H.J.,et al."Depth-dependent soil mixing persists across climate zones".Proceedings of the National Academy of Sciences of the United States of America 117.16(2020).