Fluvial Deposition and Land Use Change Control Selenium Occurrence in Mollisols of Cold Region Agroecosystems
- Kunfu PiKunfu PiSchool of Environmental Studies, China University of Geosciences, 430074 Wuhan, ChinaState Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, ChinaEcohydrology Research Group, Department of Earth and Environmental Sciences, University of Waterloo, N2L 3G1 Waterloo, CanadaHeilongjiang Key Laboratory of Black Soil and Water Resources Research, 150036 Harbin, ChinaMore by Kunfu Pi
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- Philippe Van CappellenPhilippe Van CappellenEcohydrology Research Group, Department of Earth and Environmental Sciences, University of Waterloo, N2L 3G1 Waterloo, CanadaWater Institute, University of Waterloo, N2L 3G1 Waterloo, CanadaMore by Philippe Van Cappellen
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- Yiqun GanYiqun GanSchool of Environmental Studies, China University of Geosciences, 430074 Wuhan, ChinaState Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, ChinaMore by Yiqun Gan
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- Xinlin ZhongXinlin ZhongSchool of Environmental Studies, China University of Geosciences, 430074 Wuhan, ChinaState Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, ChinaMore by Xinlin Zhong
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- Lei TongLei TongSchool of Environmental Studies, China University of Geosciences, 430074 Wuhan, ChinaState Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, ChinaHeilongjiang Key Laboratory of Black Soil and Water Resources Research, 150036 Harbin, ChinaMore by Lei Tong
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- Weitao ChenWeitao ChenHeilongjiang Key Laboratory of Black Soil and Water Resources Research, 150036 Harbin, ChinaSchool of Computer Sciences, China University of Geosciences, 430074 Wuhan, ChinaMore by Weitao Chen
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- Xun WangXun WangHeilongjiang Key Laboratory of Black Soil and Water Resources Research, 150036 Harbin, ChinaMore by Xun Wang
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- Yanxin Wang*Yanxin Wang*Email: [email protected]School of Environmental Studies, China University of Geosciences, 430074 Wuhan, ChinaState Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 430074 Wuhan, ChinaMore by Yanxin Wang
Abstract
Mollisols support the most productive agroecosystems in the world. Despite their critical links to food quality and human health, the varying distributions of selenium (Se) species and factors governing Se mobility in the mollisol vadose zone remain elusive. This research reveals that, in northern mollisol agroecosystems, Se hotspots (≥0.32 mg/kg) prevail along the regional river systems draining the Lesser Khingan Mountains, where piedmont Se-rich oil shales are the most probable source of regional Se. While selenate and selenite dominate Se species in the water-soluble and absorbed pools, mollisol organic matter is the major host for Se. Poorly crystalline and crystalline Fe oxides are subordinate in Se retention, hosting inorganic and organic Se at levels comparable to those in the adsorbed pool. The depth-dependent distributions of mollisol Se species for the non-cropland and cropland sites imply a predominance of reduced forms of Se under the mildly acidic and reducing conditions that, in turn, are variably impacted by agricultural land use. These findings therefore highlight that fluvial deposition and land use change together are the main drivers of the spatial variability and speciation of mollisol Se.
Cited By
This article is cited by 1 publications.
- Kunfu Pi, Philippe Van Cappellen, Lei Tong, Yiqun Gan, Yanxin Wang. Loss of Selenium from Mollisol Paddy Wetlands of Cold Regions: Insights from Flow-through Reactor Experiments and Process-Based Modeling. Environmental Science & Technology 2023, 57
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, 6228-6237. https://doi.org/10.1021/acs.est.3c00011