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Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.13720· OSTI ID:1401850
 [1];  [2];  [3];  [1];  [4];  [2]
  1. Department of Evolutionary Biology EBC Uppsala University Uppsala Sweden
  2. Biology Department Indiana University Bloomington IN 47405 USA
  3. Biology Department Indiana University Bloomington IN 47405 USA, Department of Forest Mycology and Plant Pathology Swedish University of Agricultural Sciences Uppsala Sweden
  4. Department of Forest Mycology and Plant Pathology Swedish University of Agricultural Sciences Uppsala Sweden

Summary

Although much is known about how trees and their associated microbes influence nitrogen cycling in temperate forest soils, less is known about biotic controls over phosphorus (P) cycling. Given that mycorrhizal fungi are instrumental for P acquisition and that the two dominant associations – arbuscular mycorrhizal ( AM ) and ectomycorrhizal ( ECM ) fungi – possess different strategies for acquiring P, we hypothesized that P cycling would differ in stands dominated by trees associated with AM vs ECM fungi.

We quantified soil solution P, microbial biomass P, and sequentially extracted inorganic and organic P pools from May to November in plots dominated by trees forming either AM or ECM associations in south‐central Indiana, USA .

Overall, fungal communities in AM and ECM plots were functionally different and soils exhibited fundamental differences in P cycling. Organic forms of P were more available in ECM plots than in AM plots. Yet inorganic P decreased and organic P accumulated over the growing season in both ECM and AM plots, resulting in increasingly P‐limited microbial biomass.

Collectively, our results suggest that P cycling in hardwood forests is strongly influenced by biotic processes in soil and that these are driven by plant‐associated fungal communities.

Sponsoring Organization:
USDOE
OSTI ID:
1401850
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 3 Vol. 209; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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