C:N:P stoichiometry in soil: Is there a "Redfield ratio" for the microbial biomass?

Cory C. Cleveland, Daniel Liptzin

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Well-constrained carbon:nitrogen:phosphorus (C:N:P) ratios in planktonic biomass, and their importance in advancing our understanding of biological processes and nutrient cycling in marine ecosystems, has motivated ecologists to search for similar patterns in terrestrial ecosystems. Recent analyses indicate the existence of "Redfield-like" ratios in plants, and such data may provide insight into the nature of nutrient limitation in terrestrial ecosystems. We searched for analogous patterns in the soil and the soil microbial biomass by conducting a review of the literature. Although soil is characterized by high biological diversity, structural complexity and spatial heterogeneity, we found remarkably consistent C:N:P ratios in both total soil pools and the soil microbial biomass. Our analysis indicates that, similar to marine phytoplankton, element concentrations of individual phylogenetic groups within the soil microbial community may vary, but on average, atomic C:N:P ratios in both the soil (186:13:1) and the soil microbial biomass (60:7:1) are well-constrained at the global scale. We did see significant variation in soil and microbial element ratios between vegetation types (i.e., forest versus grassland), but in most cases, the similarities in soil and microbial element ratios among sites and across large scales were more apparent than the differences. Consistent microbial biomass element ratios, combined with data linking specific patterns of microbial element stoichiometry with direct evidence of microbial nutrient limitation, suggest that measuring the proportions of C, N and P in the microbial biomass may represent another useful tool for assessing nutrient limitation of ecosystem processes in terrestrial ecosystems.

    Original languageEnglish
    Pages (from-to)235-252
    Number of pages18
    JournalBiogeochemistry
    Volume85
    Issue number3
    DOIs
    StatePublished - Sep 2007

    Keywords

    • Carbon
    • Microbial biomass
    • Nitrogen
    • Phosphorus
    • Soil
    • Stoichiometry

    Fingerprint

    Dive into the research topics of 'C:N:P stoichiometry in soil: Is there a "Redfield ratio" for the microbial biomass?'. Together they form a unique fingerprint.

    Cite this