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- W180844218 abstract "Soil microbial effects of adding lime and earthworms to acidic upland grassland were investigated.Experiments were conducted in-situ, in an outdoor macrocosm and in laboratory microcosms. Thiswas one of 16 team projects designed to assess biological diversity and ecosystem function in anupland grassland ecosystem as part of the UK NERC's Thematic Programme on Biological Diversityand Ecosystem Function in Soil.Liming had a much greater effect than earthworm additions. The majority of treatment effects werelimited to the surface L, F and H horizons. Liming reduced microbial biomass (ATP analysis) andactivity (dehydrogenase analysis) in the field studies, but did not affect microbial activity in themicrocosm soil. Earthworms had no effect on microbial biomass or activity in the macrocosm or limedmicrocosm soil, but reduced both the microbial biomass and activity of the un-limed microcosm soil.Principal component analysis of phospholipid fatty acid (PLFA) profiles separated the microbialcommunity structure of the limed from the un-limed soil. Effects of liming common to allexperiments included increases of the fatty acid 16:lco5 (indicative of arbuscular mycorrhizal fungi),monounsaturated straight chain fatty acids and an increased fungi :bacterial fatty acid ratio. The fattyacid 18:2co6 (indicative of ectomycorrhizal fungi) only increased in the Sweethope experiment. Bothbacterial PLFAs and the trans:cis ratio of 16: Ico7 (indicating bacterial stress) were reduced. Substrateamendment increased CO 2 generation of the limed microcosm soil. Application of Grime's ecologicalstrategy theory suggests that liming shifted the soil microbial community from a stress tolerator to aruderal community.Earthworm effects on microbial fatty acid composition were limited. These affects were apparent inthe un-limed but not the limed microcosm soil. Conversely, earthworms affected the limed rather thanun-limed soil in the Sweethope experiment, but effects were only evident 17-months after earthwormadditions. The biomass of A. chlorotica was correlated negatively to bacterial PLFA and positively to16: Ico5. Earthworm faeces could be distinguished from surrounding soil by reduced Shannondiversity and evenness scores and shifts in PLFA profiles. The effect of earthworms on CO 2generation of microcosm soil was minor in comparison to the effect of liming." @default.
- W180844218 created "2016-06-24" @default.
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- W180844218 date "2003-08-01" @default.
- W180844218 modified "2023-09-28" @default.
- W180844218 title "The interaction between earthworms, liming and soil microbial community diversity and function in upland grassland" @default.
- W180844218 hasPublicationYear "2003" @default.
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