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Journal Article | Research Support, Non-U.S. Gov't

Dynamics of a microbial community associated with manure hot spots as revealed by phospholipid fatty acid analyses.

A Frostegård, S O Petersen, E Bååth, T H Nielsen
A Frostegård
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S O Petersen
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E Bååth
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T H Nielsen
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ABSTRACT

Microbial community dynamics associated with manure hot spots were studied by using a model system consisting of a gel-stabilized mixture of soil and manure, placed between layers of soil, during a 3-week incubation period. The microbial biomass, measured as the total amount of phospholipid fatty acids (PLFA), had doubled within a 2-mm distance from the soil-manure interface after 3 days. Principal-component analyses demonstrated that this increase was accompanied by reproducible changes in the composition of PLFA, indicating changes in the microbial community structure. The effect of the manure was strongest in the 2-mm-thick soil layer closest to the interface, in which the PLFA composition was statistically significantly different (P < 0.05) from that of the unaffected soil layers throughout the incubation period. An effect was also observed in the soil layer 2 to 4 mm from the interface. The changes in microbial biomass and community structure were mainly attributed to the diffusion of dissolved organic carbon from the manure. During the initial period of microbial growth, PLFA, which were already more abundant in the manure than in the soil, increased in the manure core and in the 2-mm soil layer closest to the interface. After day 3, the PLFA composition of these layers gradually became more similar to that of the soil. The dynamics of individual PLFA suggested that both taxonomic and physiological changes occurred during growth. Examples of the latter were decreases in the ratios of 16:1 omega 7t to 16:1 omega 7c and of cyclopropyl fatty acids to their respective precursors, indicating a more active bacterial community. An inverse relationship between bacterial PLFA and the eucaryotic 20:4 PLFA (arachidonic acid) suggested that grazing was important.

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Dynamics of a microbial community associated with manure hot spots as revealed by phospholipid fatty acid analyses.
A Frostegård, S O Petersen, E Bååth, T H Nielsen
Applied and Environmental Microbiology Jun 1997, 63 (6) 2224-2231; DOI:

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Dynamics of a microbial community associated with manure hot spots as revealed by phospholipid fatty acid analyses.
A Frostegård, S O Petersen, E Bååth, T H Nielsen
Applied and Environmental Microbiology Jun 1997, 63 (6) 2224-2231; DOI:
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