Interactions of bacteria, protozoa and plants leading to mineralization of soil nitrogen

Clarholm, Marianne

doi:10.1016/0038-0717(85)90113-0

Cited by 609 publications

(373 citation statements)

References 20 publications

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“…The higher diversity found after repeated glucose pulses may be explained by trophic interactions where predators graze on prey populations that have been enlarged by resource addition, suppressing competition between prey species and causing secondary mobilization of nutrients (Clarholm, 1985). The decrease in total bacterial 16S rRNA gene copies in the repeated-pulse-compared with the single-pulse-treatment (Supplementary Figure 4) supports predation as a potential mechanism explaining the observed diversity increase after repeated glucose pulses.…”

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confidence: 81%

Linking soil bacterial biodiversity and soil carbon stability

et al. 2014

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Native soil carbon (C) can be lost in response to fresh C inputs, a phenomenon observed for decades yet still not understood. Using dual-stable isotope probing, we show that changes in the diversity and composition of two functional bacterial groups occur with this 'priming' effect. A single-substrate pulse suppressed native soil C loss and reduced bacterial diversity, whereas repeated substrate pulses stimulated native soil C loss and increased diversity. Increased diversity after repeated C amendments contrasts with resource competition theory, and may be explained by increased predation as evidenced by a decrease in bacterial 16S rRNA gene copies. Our results suggest that biodiversity and composition of the soil microbial community change in concert with its functioning, with consequences for native soil C stability.

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confidence: 81%

Linking soil bacterial biodiversity and soil carbon stability

et al. 2014

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“…Bacteria mineralize N from soil organic matter and calculations by Clarholm [25,26] gave evidence that protozoan grazing results in the release of this additional N. Using [ 15 N]-labelled bacteria, Kuikman et al [78] and Kuikman and Van Veen [76] confirmed that grazing by protozoa increases the availability of nitrogen to plants originating from bacterial cells but also from soil organic matter. Clarholm [26] argued, that when no N is lost by exudation, the readily available carbon compounds in root exudates stimulate growth of dormant microbial populations along the root tip, resulting in mineralization of nitrogen from the soil organic matter and subsequent incorporation of N into microbial biomass.…”

Section: Bacteria-microfauna Interactionsmentioning

confidence: 99%

Microbial-faunal interactions in the rhizosphere and effects on plant growth

Bonkowski

Cheng

Griffiths³

et al. 2000

European Journal of Soil Biology

178

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− Nutrient acquisition by plants occurs in an environment characterized by complex interactions between roots, micro-organisms and animals, termed the rhizosphere. Competition for mineral elements in this sphere is high. The rhizosphere processes are driven by photosynthetically fixed carbon released by roots either directly to mycorrhizal fungal symbionts or as exudates fuelling a wider spectrum of organisms, mainly bacteria. In particular, the role of the soil fauna interacting with rhizosphere micro-organisms and plant roots has so far found little attention. We present evidence that the interaction between plant roots, root exudates and micro-organisms can only be understood in relation to soil faunal activity, indicating that the soil fauna has an important function in regulating rhizosphere microbial processes and therefore significantly affects plant growth. © 2000 Éditions scientifiques et médicales Elsevier SAS rhizosphere / microbial activity / soil biota / food web interactions / plant growth

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“…More than 800 species have been described from terrestrial habitats (Foissner et al, 2002). Their importance as key mediators for several soil ecosystem processes such as the enhancement and regulation of nutrient cycling or decomposition rates to the benefit of plants and microorganisms has been well documented (Clarholm, 1985). Soil ciliate communities comprise several functional groups such as the usually dominating bacterivores, the fungivores, the omnivores and the detritivores.…”

Section: Introductionmentioning

confidence: 99%