Abstract
Aims
Vegetation stimulates, in general, soil mineral weathering. It has been hypothesized that plant-associated microorganisms, especially ectomycorrhizal fungi play a major role in this process. We studied apatite dissolution in a vegetation gradient in southern Norway to test the role of ectomycorrhizal vegetation on mineral weathering.
Methods
A natural occurring lead contamination, probably present since the last glaciation, caused a gradient from bare soil, via sparse grass to healthy spruce forest. We measured apatite content, soil solution chemistry, δ 13C, δ 15N, C, N and ergosterol content in soil profiles along the gradient.
Results
The apatite loss for each soil depth could be described by the same proton-based, dissolution function over the whole vegetation gradient. The deviation from the 30–40 cm depth pH model showed, in the top 20 cm, a negative correlation with ergosterol, and a positive correlation with δ 13C. These correlations could reflect an inhibiting effect of biotic activity through the production of large weight organic acids and degradation of low molecular weight organic acids.
Conclusions
Vegetation accelerates apatite dissolution by acidifying the soil solution, but soil fungi appeared to have a retarding, rather than an enhancing effect on this process.
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Acknowledgments
Funding was provided by the Swedish Energy Agency (STEM), the Swedish Research Council and the Flemish Research Foundation (FWO). We like to thank Tommy Olsson, from Lund University, for technical support with the ICP-AES. We gratefully acknowledge the useful comments of two anonymous reviewers and the section editor (Thomas Kuyper).
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Table S1
Soil solution element composition obtained from fresh soil samples by centrifugation (s.e. based on the three replicated soil pits in italics). (DOCX 23 kb)
Fig. S1
Sr versus Ca in the apatite extraction step in unground (‘Free apatite’) and ground (‘occluded apatite’) soil samples. (GIF 28 kb)
Fig. S2
Ca versus P in the apatite extraction step in the unground soil samples. The dashed line denotes the theoretical ratio in fluorapatite (Ca5(PO4)3F). (GIF 30 kb)
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Smits, M.M., Johansson, L. & Wallander, H. Soil fungi appear to have a retarding rather than a stimulating role on soil apatite weathering. Plant Soil 385, 217–228 (2014). https://doi.org/10.1007/s11104-014-2222-6
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DOI: https://doi.org/10.1007/s11104-014-2222-6