Abstract
The depletion of calcium in forest ecosystems of the northeastern USA1,2,3 is thought to be a consequence of acidic deposition and to be at present restricting the recovery of forest and aquatic systems4,5,6,7 now that acidic deposition itself is declining. This depletion of calcium has been inferred from studies1,2,3 showing that sources of calcium in forest ecosystems—namely, atmospheric deposition and mineral weathering of silicate rocks such as plagioclase, a calcium-sodium silicate—do not match calcium outputs observed in forest streams. It is therefore thought that calcium is being lost from exchangeable and organically bound calcium in forest soils. Here we investigate the sources of calcium in the Hubbard Brook experimental forest, through analysis of calcium and strontium abundances and strontium isotope ratios within various soil, vegetation and hydrological pools. We show that the dissolution of apatite (calcium phosphate) represents a source of calcium that is comparable in size to known inputs from atmospheric sources and silicate weathering. Moreover, apatite-derived calcium was utilized largely by ectomycorrhizal tree species, suggesting that mycorrhizae may weather apatite and absorb the released ions directly, without the ions entering the exchangeable soil pool. Therefore, it seems that apatite weathering can compensate for some of the calcium lost from base-poor ecosystems, and should be considered when estimating soil acidification impacts and calcium cycling.
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References
Likens, G. E., Driscoll, C. T. & Buso, D. C. Long-term effects of acid rain: Response and recovery of a forest ecosystem. Science 272, 244–246 (1996)
Likens, G. E. et al. The biogeochemistry of calcium at Hubbard Brook. Biogeochemistry 41, 89–173 (1998)
Bailey, S. W., Buso, D. C. & Likens, G. E. Implications of sodium mass balance for interpreting the calcium cycle of a northern hardwood ecosystem. Ecology (submitted)
Huntington, T. G. The potential for calcium depletion in forest ecosystems of southeastern United States: Review and analysis. Glob. Biogeochem. Cycles 14, 623–638 (2000)
Federer, C. A. et al. Long-term depletion of calcium and other nutrients in eastern US forests. Environ. Mgmt 13, 593–601 (1989)
Lawrence, G. B. et al. Soil calcium status and the response of stream chemistry to changing acidic deposition rates in the Catskill Mountains of New York. Ecol. Applic. 9, 1059–1072 (1999)
Johnson, C. E., Driscoll, C. T., Siccama, T. G. & Likens, G. E. Element fluxes and landscape position in a northern hardwood forest watershed ecosystem. Ecosystems 3, 159–184 (2000)
Likens, G. E. & Borman, F. H. Biogeochemistry of a Forested Ecosystem, 2nd edn (Springer, New York, 1995)
Jones, E. V. et al. The dissolution of apatite in the presence of aqueous metal cations at pH 2-7. Chem. Geol. 15, 215–233 (1998)
Brantley, S. L. & Chen, Y. in Chemical Weathering Rates of Silicate Minerals (eds White, A. F. & Brantley, S. L.) 119–172 (Mineralogical Society of America, Washington DC, 1995)
Blum, A. E. & Stillings, L. L. in Chemical Weathering Rates of Silicate Minerals (eds White, A. F. & Brantley, S. L.) 291–352 (Mineralogical Society of America, Washington DC, 1995)
Hogan, J. F., Blum, J. D., Siegel, D. I. & Glaser, P. H. 87Sr/86Sr as a tracer of groundwater discharge and precipitation recharge in the Glacial Lake Agassiz Peatlands, Northern Minnesota, USA. Wat. Resour. Res. 36, 3701–3710 (2000)
Capo, R. C., Stewart, B. W. & Chadwick, O. A. Strontium isotopes as tracers of ecosystem processes: theory and methods. Geoderma 82, 197–225 (1998)
Blum, J. D., Taliaferro, H., Weisse, M. T. & Holmes, R. T. Changes in Sr/Ca, Ba/Ca and 87Sr/86Sr ratios between trophic levels in two forest ecosystems in the northeastern USA. Biogeochemistry 49, 87–101 (2000)
Miller, E. K., Blum, J. D. & Friedland, A. J. Determination of soil exchangeable-cation loss and weathering rates using Sr isotopes. Nature 362, 438–441 (1993)
Bailey, S. W., Hornbeck, J. W., Driscoll, C. T. & Gaudette, H. E. Calcium inputs and transport in a base-poor forest ecosystem as interpreted by Sr isotopes. Wat. Resour. Res. 32, 707–719 (1996)
Vitousek, P. M., Kennedy, M. J., Derry, L. A. & Chadwick, O. A. Weathering versus atmospheric sources of strontium in ecosystems on young volcanic soils. Oecologia 121, 255–259 (1999)
Runia, L. T. Strontium and calcium distribution in plants: effect on palaeodietary studies. J. Archaeol. Sci. 14, 599–608 (1987)
Åberg, G., Jacks, G. & Hamilton, J. Weathering rates and 87Sr/86Sr ratios: an isotopic approach. J. Hydrol. 109, 65–78 (1989)
Kistler, R. W., Chappell, B. W., Peck, D. L. & Bateman, P. C. Isotopic variation in the Tuolumne Intrusive Suite, central Sierra Nevada, California. Contrib. Mineral. Petrol. 94, 205–220 (1986)
Creaser, R. A. & Gray, C. M. Preserved initial Sr-87/Sr-86 in apatite from altered felsic igneous rocks—a case-study from the middle Proterozoic of south-Australia. Geochim. Cosmochim. Acta. 56, 2789–2795 (1992)
Van Breeman, N. et al. Mycorrhizal weathering: a true case of mineral plant nutrition? Biogeochemistry 49, 53–67 (2000)
Wallander, H., Johansson, L. & Pallon, J. PIXE analysis to estimate the elemental composition of ectomycorrhizal rhizomorphs grown in contact with different minerals in forest soil. FEMS Microbiol. Ecol. 1320, 1–10 (2002)
Wallander, H. Uptake of P from apatite by Pinus sylvestris seedlings colonized by different ectomycorrhizal fungi. Plant Soil 218, 249–256 (2000)
Yawney, W. J. & Schultz, R. C. Anatomy of a vesicular-arbuscular endomycorrhizal symbiosis between sugar maple (Acer saccharum Marsh) and Glomus etunicatum Becker and Gerdemann. New Phytol. 114, 47–57 (1990)
Long, R. P., Horsley, S. B. & Lilja, P. R. Impact of forest liming on growth and crown vigor of sugar maple and associated hardwoods. Can. J. Forest. Res. 27, 1560–1573 (1997)
Pozwa, A., Dambrine, E., Pollier, B. & Atteia, O. A comparison between Ca and Sr cycling in forest ecosystems. Plant Soil 225, 299–310 (2000)
Yanai, R. D. Phosphorus budget of a 70-year-old northern hardwood forest. Biogeochemistry 17, 1–22 (1992)
Driscoll, C. T. et al. Acidic deposition in the northeastern United States: sources and inputs, ecosystem effects, and management strategies. Bioscience 51, 180–198 (2001)
Johnson, C. E. & Petras, R. J. Distribution of zinc and lead fractions within a forest Spodosol. Soil Sci. Soc. Am. J. 62, 782–789 (1998)
Acknowledgements
We thank S. Bailey, D. Buso, S. Hamburg, J. Hogan and R. Yanai for discussions, and H. Wallander and L. Derry for comments and suggestions. This research was supported by the NSF, and carried out at the Hubbard Brook experimental forest, which is operated and maintained by the Northeastern Forest Experiment Station, US Department of Agriculture.
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Blum, J., Klaue, A., Nezat, C. et al. Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems. Nature 417, 729–731 (2002). https://doi.org/10.1038/nature00793
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DOI: https://doi.org/10.1038/nature00793
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