Organic matter composition and the protist and nematode communities around anecic earthworm burrows

Walter S. Andriuzzi, Phuong-Thi Ngo, Stefan Geisen, Aidan M. Keith, Kenneth Dumack, Thomas Bolger, Michael Bonkowski, Lijbert Brussaard, Jack H. Faber, Abad Chabbi, Cornelia Rumpel, Olaf Schmidt

Research output: Contribution to journal/periodicalArticleScientificpeer-review

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Abstract

By living in permanent burrows and incorporating organic detritus from the soil surface, anecic earthworms contribute to soil heterogeneity, but their impact is still under-studied in natural field conditions. We investigated the effects of the anecic earthworm Lumbricus centralis on fresh carbon (C) incorporation, soil organic matter composition, protists, and nematodes of a Cambisol under grassland. We used plant material labelled with stable isotope tracers to detect fresh C input around earthworm-occupied burrows or around burrows from which the earthworm had been removed. After 50 days, we sampled soil (0--10 cm depth) in concentric layers around the burrows, distinguishing between drilosphere (0--8 mm) and bulk soil (50--75 mm). L. centralis effectively incorporated fresh C into the drilosphere, and this shifted soil organic matter amount and chemistry: total soil sugar content was increased compared to unoccupied drilosphere and bulk soil, and the contribution of plant-derived sugars to soil organic matter was enhanced. Earthworms also shifted the spatial distribution of soil C towards the drilosphere. The total abundance of protists and nematodes was only slightly higher in earthworm-occupied drilosphere, but strong positive effects were found for some protist clades (e.g. Stenamoeba spp.). Additional data for the co-occurring anecic earthworm species Aporrectodea longa showed that it incorporated fresh C less than L. centralis, suggesting that the two species may have different effects on soil C distribution and organic matter quality.
Original languageEnglish
Pages (from-to)91-100
Number of pages10
JournalBiology and Fertility of Soils
Volume52
Issue number1
DOIs
Publication statusPublished - 2016

Keywords

  • international

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