Abstract
Few studies of silicate mineral weathering have been conducted in carbonate-bearing temperate forest soils. With climate and vegetation held constant, we compared soil mineralogy and major element chemistry of soil waters from a carbonate-free temperate aspen forest site in the Cheboygan watershed, northern Michigan, with that from carbonate-containing soils from experimental tree-growth chambers (low- vs. high- fertility). All soils were well-drained sands (quartz, Na-rich plagioclase, and K-feldspar) with minor amounts of carbonate present only in the experimentally manipulated soils. The Na+ concentrations in soil waters corrected for atmospheric deposition (Na*) were used to compare relative rates of plagioclase feldspar weathering across sites. In natural soil water profiles, maximum concentrations of Na*, Si, and dissolved organic carbon (DOC) were observed by a depth of 15 cm, a soil zone free of carbonate minerals. Mean Na* and DOC concentrations were different in the three soils, and increased in the order natural soil < low-fertility chambers < high-fertility chambers. While low pH environments are generally viewed as enhancing weathering rates, here higher Na* appears to be related to high DOC, which is consistent with observed increases in active organic functional groups as pH increases. Our results suggest that under a specific vegetative cover, the soil carbon environment affects the weathering flux observed. Our study also suggests that disturbed soils provide an enhanced physical and chemical environment for weathering. Generalized silicate weathering models may benefit from including the enhancing effects of organic anions at moderate pH in addition to precipitation and temperature.
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Acknowledgments
Support for this project was provided by the U.S. Environmental Protection Agency’s Water and Watersheds Program (EPA R 82979-01-0), the National Science Foundation (EAR 0208182), and the NSF Integrated Graduate Education and Research Training Program’s Biosphere Atmosphere Research Training fellowship. The U.S. Department of Energy (DE-FG02-93ER6166) provided support to construct and maintain the chamber experiments. The authors are grateful to University of Michigan Biological Station personnel for excellent logistical support. Andrea Klaue and Professor Joel D. Blum (Department of Geological Sciences, University of Michigan) are thanked for assistance with LiBO2 digests and a portion of the ICP-OES analyses.
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Williams, E.L., Walter, L.M., Ku, T.C.W. et al. Silicate weathering in temperate forest soils: insights from a field experiment. Biogeochemistry 82, 111–126 (2007). https://doi.org/10.1007/s10533-006-9057-z
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DOI: https://doi.org/10.1007/s10533-006-9057-z