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Drivers of phosphorus limitation across soil microbial communities
Stockholm University, Faculty of Science, Department of Physical Geography.
Number of Authors: 4
2016 (English)In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 30, no 10, 1705-1713 p.Article in journal (Refereed) Published
Abstract [en]

Nutrient limitation of soil microbial communities controls the rates of plant litter and soil organic matter decomposition and nutrient mineralization, and as such, it is central to soil and ecosystem models. According to ecological stoichiometry theory, when the carbon (C)-to-nutrient (E) ratio of resources used by a microbial community is higher than a critical ratio (C:E-CR), that nutrient is limiting. The C-to-phosphorus (P) critical ratio (C:P-CR) that determines P limitation is largely unknown for soils, and thus, it is the subject of our study. Our results show that the C:P-CR in widely different soils ranges from 26<bold></bold>6 to 465<bold></bold>1 or from 20<bold></bold>9 to 740<bold></bold>7 when accounting for 95% confidence intervals. Using constant or narrowly fluctuating C:P-CR in ecosystem models is therefore inaccurate. The C:P-CR cannot be simply predicted from microbial community C:P or available soil P. C:P-CR was only related to relative abundance of phospholipid fatty acids, which reflects microbial community structure and physiology. Our data suggest complex controls over microbial community C:P-CR. We further propose that using P storage compounds that allow the microbial community to temporarily buffer variability in available P can represent a widely adopted strategies across soils.

Place, publisher, year, edition, pages
2016. Vol. 30, no 10, 1705-1713 p.
Keyword [en]
ecological stoichiometry, Monod equation, nutrient limitation, phosphorus mineralization and immobilization, phospholipid fatty acid, soil microbial community
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-136102DOI: 10.1111/1365-2435.12650ISI: 000385511500010OAI: oai:DiVA.org:su-136102DiVA: diva2:1050871
Available from: 2016-11-30 Created: 2016-11-29 Last updated: 2016-11-30Bibliographically approved

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