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Drivers of phosphorus limitation across soil microbial communities
Author(s) -
Čapek Petr,
Kotas Petr,
Manzoni Stefano,
Šantrůčková Hana
Publication year - 2016
Publication title -
functional ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 154
eISSN - 1365-2435
pISSN - 0269-8463
DOI - 10.1111/1365-2435.12650
Subject(s) - nutrient , microbial population biology , biology , soil water , mineralization (soil science) , ecology , ecosystem , phosphorus , microbial ecology , ecological stoichiometry , relative species abundance , community structure , soil organic matter , nutrient cycle , plant litter , abundance (ecology) , bacteria , chemistry , genetics , organic chemistry
SummaryNutrient 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 26·6 to 465·1 or from 20·9 to 740·7 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.