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Tree mycorrhizal type predicts within‐site variability in the storage and distribution of soil organic matter

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.14132· OSTI ID:1433416
 [1];  [2];  [3];  [1];  [4];  [1]
  1. Department of Biology Indiana University Bloomington IN USA
  2. Smithsonian Tropical Research Institute Balboa, Ancon Panama
  3. Key Laboratory of Forest Ecology and Management Institute of Applied Ecology Chinese Academy of Sciences Shenyang China
  4. Los Alamos National Laboratory Los Alamos NM USA
Abstract

Forest soils store large amounts of carbon (C) and nitrogen (N), yet how predicted shifts in forest composition will impact long‐term C and N persistence remains poorly understood. A recent hypothesis predicts that soils under trees associated with arbuscular mycorrhizas ( AM ) store less C than soils dominated by trees associated with ectomycorrhizas ( ECM ), due to slower decomposition in ECM ‐dominated forests. However, an incipient hypothesis predicts that systems with rapid decomposition—e.g. most AM ‐dominated forests—enhance soil organic matter ( SOM ) stabilization by accelerating the production of microbial residues. To address these contrasting predictions, we quantified soil C and N to 1 m depth across gradients of ECM ‐dominance in three temperate forests. By focusing on sites where AM ‐ and ECM ‐plants co‐occur, our analysis controls for climatic factors that covary with mycorrhizal dominance across broad scales. We found that while ECM stands contain more SOM in topsoil, AM stands contain more SOM when subsoil to 1 m depth is included. Biomarkers and soil fractionations reveal that these patterns are driven by an accumulation of microbial residues in AM ‐dominated soils. Collectively, our results support emerging theory on SOM formation, demonstrate the importance of subsurface soils in mediating plant effects on soil C and N, and indicate that shifts in the mycorrhizal composition of temperate forests may alter the stabilization of SOM .

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0016188
OSTI ID:
1433416
Journal Information:
Global Change Biology, Journal Name: Global Change Biology Journal Issue: 8 Vol. 24; ISSN 1354-1013
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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