DOI: 10.1029/2018GB005974
论文题名: Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories
作者: Richardson J.B. ; Aguirre A.A. ; Buss H.L. ; Toby O'Geen A. ; Gu X. ; Rempe D.M. ; Richter D.D.B.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 10 语种: 英语
英文关键词: chemical weathering
; concentration (composition)
; critical analysis
; ecosystem service
; mercury (element)
; montane forest
; regolith
; sampling
; soil organic matter
; source-sink dynamics
; Boulder Creek [Wisconsin]
; Calhoun County [Florida]
; California
; Colorado
; Eel River
; Florida [United States]
; Front Range
; New Mexico
; Pennsylvania
; Piedmont [United States]
; Puerto Rico
; Rocky Mountains
; Shale Hills
; Sierra County [New Mexico]
; Sierra Nevada [California]
; South Carolina
; United States
; Wisconsin
学科: critical zone
; excess mercury
; mercury cycling
; mercury inventories
; regolith
; soil
中文摘要: Mercury sequestration in regolith (soils + weathered bedrock) is an important ecosystem service of the critical zone. This has largely remained unexplored, due to the difficulty of sample collection and the assumption that Hg is predominantly sequestered within surface soils (here we define as 0–0.3 m). We measured Hg concentrations and inventories in weathering profiles at six Critical Zone Observatories (CZOs): Boulder Creek in the Front Range of Colorado, Calhoun in the South Carolina Piedmont, Eel River in coastal northern California, Luquillo in the tropical montane forest of Puerto Rico, Shale Hills of the valley and ridges of central Pennsylvania, and Southern Sierra in the Sierra Nevada range of California. Surface soils had higher Hg concentrations than the deepest regolith samples, except for Eel River, which had lower Hg concentrations in surface soils compared to regolith. Using Ti normalization, CZOs with <12% rock-derived Hg (Boulder Creek, Calhoun, and Southern Sierra) had Hg peaks between 1.5 and 8.0 m in depth. At CZOs with >50% rock-derived Hg, Eel River Hg concentrations and pools were greatest at >4.0 m in the weathering profile, while Luquillo and Shale Hills had peaks at the surface that diminished within 1.0 m of the surface. Hg and total organic C were only significantly correlated in regolith at Luquillo and Shale Hills CZOs, suggesting that Hg sorption to organic matter may be less dominant than clays or Fe(II) sulfides in deeper regolith. Our results demonstrate the importance of Hg sequestration in deep regolith, below typical soil sampling depths. ©2018. 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/160187
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Department of Geoscience, University of Massachusetts Amherst, Amherst, MA, United States; School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Department of Land, Air and Water Resources, University of California, Davis, CA, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA, United States; Department of Geosciences, Jackson School of Geosciences, University of Texas Austin, Austin, TX, United States; University Program in Ecology and Nicholas School of Environment, Duke University, Durham, NC, United States
Recommended Citation:
Richardson J.B.,Aguirre A.A.,Buss H.L.,et al. Mercury Sourcing and Sequestration in Weathering Profiles at Six Critical Zone Observatories[J]. Global Biogeochemical Cycles,2018-01-01,32(10)