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Related Experiment Videos

Microbial nitrogen limitation increases decomposition.

Joseph M Craine1, Carl Morrow, Noah Fierer

  • 1Department of Ecology, Evolution, and Behavior, 100 Ecology, 1987 Upper Buford Circle, Saint Paul, Minnesota 55108, USA. Joseph.M.Craine@dartmouth.edu

Ecology
|September 11, 2007
PubMed
Summary
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Microbial decomposition of organic matter is complex. Low nitrogen can increase decomposition by microbes mining for nitrogen, but this is reduced by high nitrogen availability or substrate nitrogen. Phosphorus fertilization consistently increases decomposition.

Area of Science:

  • Ecology
  • Biogeochemistry
  • Soil Science

Background:

  • Anthropogenic nutrient enrichment globally raises fundamental questions about nutrient roles in organic matter decomposition.
  • Existing stoichiometric decomposition theory provides a framework for understanding these processes.
  • The impact of nitrogen and phosphorus on decomposition requires further investigation across diverse ecosystems.

Purpose of the Study:

  • To investigate the effects of exogenous nitrogen (N) and phosphorus (P) on litter decomposition.
  • To test the influence of nutrient availability on carbon (C) mineralization across various litter and soil types.
  • To evaluate the validity of current stoichiometric decomposition theory under increased nutrient inputs.

Main Methods:

  • Compared C mineralization across diverse plant litter types added to a single soil.

Related Experiment Videos

  • Assessed C mineralization of a single substrate across 50 different soil types.
  • Quantified the impact of varying nitrogen and phosphorus concentrations on decomposition rates.

    • Main Results:

    • Observed that low nitrogen availability can enhance litter decomposition through microbial nitrogen mining.
    • Found that microbial nitrogen mining is suppressed by high soil N supply or high substrate N concentrations.
    • Demonstrated no evidence of phosphorus mining; P fertilization consistently increased short- and long-term mineralization.

    Conclusions:

    • Results challenge basic stoichiometric decomposition theory, indicating a need for revision.
    • Ecosystem models require restructuring to accurately predict carbon storage responses to altered nutrient availability.
    • Understanding microbial responses to nutrient inputs is crucial for predicting ecosystem functions.