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

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Show simple item record Yunusa, IAM Braun, M Lawrie, R 2010-05-28T09:44:04Z 2009-05
dc.identifier.citation Applied Soil Ecology, 2009, 42 (1), pp. 63 - 68
dc.identifier.issn 0929-1393
dc.identifier.other C1 en_US
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 soil management. 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 (τ) 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. Crown Copyright © 2009.
dc.language eng
dc.relation.isbasedon 10.1016/j.apsoil.2009.02.002
dc.title Amendment of soil with coal fly ash modified the burrowing habits of two earthworm species
dc.type Journal Article
dc.parent Applied Soil Ecology
dc.journal.volume 1
dc.journal.volume 42
dc.journal.number 1 en_US
dc.publocation Amsterdam en_US
dc.identifier.startpage 63 en_US
dc.identifier.endpage 68 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0503 Soil Sciences
dc.personcode 910301
dc.personcode 030005
dc.percentage 100 en_US Soil Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition 63-68 en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Burrow volume
dc.description.keywords Burrow volume
dc.description.keywords Coal fly ash
dc.description.keywords Coal fly ash
dc.description.keywords Earthworms
dc.description.keywords Earthworms
dc.description.keywords Soil structure
dc.description.keywords Soil structure
dc.description.keywords Tortuosity
dc.description.keywords Tortuosity
dc.description.keywords X-ray computed tomography
dc.description.keywords X-ray computed tomography
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of Physics and Advanced Materials (ID: 343)

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