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Enchytraeid worm (Oligochaeta) influences on microbial community structure, nutrient dynamics, and plant growth in blanket peat subjected to warming.

Cole, Lisa and Bardgett, Richard D. and Ineson, Philip and Hobbs, P. J. (2002) Enchytraeid worm (Oligochaeta) influences on microbial community structure, nutrient dynamics, and plant growth in blanket peat subjected to warming. Soil Biology and Biochemistry, 34 (1). pp. 83-92. ISSN 0038-0717

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Abstract

Our aim was to determine whether the response of below-ground feedback processes to atmospheric warming affects nutrient dynamics and primary production in a model peatland ecosystem. Specifically, we examined the interactions between a dominant soil animal of a blanket peat ecosystem (Enchytraeidae, Oligochaeta) and microbes in response to soil warming (to 6°C above current mean summer temperatures), and the consequences of these interactions for nutrient mineralisation and the growth of the graminoid Festuca ovina L. Enchytraeids reduced soil microbial biomass (total PLFA) by 23%, but did not affect soil nutrient availability or plant nutrient content. Enchytraeids did, however, increase C mineralisation by 8%, measured as dissolved organic carbon (DOC) release in the soil solution. Atmospheric warming increased plant nutrient uptake (increasing shoot N and P contents by 12 and 11%, respectively), but reduced the function of enchytraeids with respect to their role in DOC release (by 16%). These findings suggest that in the short term, independent of the effects of enchytraeids, warming may have reduced the ability of the soil microbial biomass to immobilise nutrients and may have relaxed the competition for nutrients between plants and microbes in these nutrient poor soils, increasing the ability of plants to act as a nutrient sink. The results suggest that although soil warming may disrupt biological interactions that are presently operating in these ecosystems, this may not necessarily result in detrimental effects on ecosystem function, which we determined by the growth of F. ovina.

Item Type: Article
Journal or Publication Title: Soil Biology and Biochemistry
Uncontrolled Keywords: Atmospheric warming ; Enchytraeids ; Festuca ovina ; Nutrient mineralisation ; PLFA ; DOC ; Soil microbes ; Blanket peat
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 10282
Deposited By: Prof Richard Bardgett
Deposited On: 10 Jul 2008 16:43
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 10:48
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10282

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