Amendment of soil with coal fly ash modified burrowing habits of two earthworm species

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dc.contributor.author Yunusa, Isa en_US
dc.contributor.author Braun, Michael en_US
dc.contributor.author R, Lawries en_US
dc.contributor.editor en_US
dc.date.accessioned 2010-05-28T09:44:04Z
dc.date.available 2010-05-28T09:44:04Z
dc.date.issued 2009 en_US
dc.identifier 2008003913 en_US
dc.identifier.citation Yunusa Isa, Braun Michael, and R Lawries 2009, 'Amendment of soil with coal fly ash modified burrowing habits of two earthworm species', Elsevier, vol. 42, no. 1, pp. 63-68. en_US
dc.identifier.issn 0929-1393 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/8566
dc.description.abstract A good understanding of how soil biota responds to amendment of agricultural soils with coal fly ash is imperative to developing protocols for routine use of this industrial by-product for soilmanagement. We used X-ray computed tomography (CT) images to determined key structural characteristics of burrows created by earthworms of native megascolecid and exotic Aporrectodea trapezoides in intact soil cores (150 mm ID by 0.3 m deep) that were treated with coal fly ash at 0, 5 or 25 Mg ha 1 mixed into the top 50 mm of the cores. The cores were inoculated at a rate equivalent to 850 worms m 2 and after 6 weeks we found that fly ash reduced the total volume of the burrow system (Vs) by up to 39% for the native species and 29% for the exotic species due mostly to fewer and smaller burrows; these reductions averaged 33% with addition of ash at 5 Mg ha 1 and 39% at 25 Mg ha 1. While the native earthworms responded to treatment by burrowing deeper into the soil core and away from the ash-tainted surface soil, the exotic species reduced the depth of burrowing and remained close to the surface. Fly ash addition did not have significant effect on tortuosity (t) of the burrows for either earthworm species. A. trapezoides created predominantly vertical burrows, while the native megascolecid worms produced more horizontally oriented burrows in addition to vertical ones. These modifications of earthworm behavior by fly ash addition to soil, along with previous experience with plant growth, suggest that an ash application rate of 5 Mg ha 1is close to optimum for routine agronomic applications. Structural analysis of the burrows as presented in this paper provide more useful information on the response of earthworm behaviour to fly ash that may not be apparent from an assessment of population and growth of these important soil biota. en_US
dc.language en_US
dc.publisher Elsevier en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.apsoil.2009.02.002 en_US
dc.title Amendment of soil with coal fly ash modified burrowing habits of two earthworm species en_US
dc.parent Applied Soil Ecology en_US
dc.journal.volume 42 en_US
dc.journal.number 1 en_US
dc.publocation Amsterdam en_US
dc.identifier.startpage 63 en_US
dc.identifier.endpage 68 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 050300 en_US
dc.personcode 030005 en_US
dc.personcode 910301 en_US
dc.personcode 0000049626 en_US
dc.percentage 100 en_US
dc.classification.name Soil Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition 63-68 en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Burrow volume, Earthworms, Coal fly ash, Tortuosity, Soil structure, X-ray computed tomography en_US
dc.staffid en_US


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