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Can soil nematode community structure be used to indicate soil carbon dynamics in horticultural systems?

Pattison, A. and Kukulies, T. and Forsyth, L. and Geense, P. (2014) Can soil nematode community structure be used to indicate soil carbon dynamics in horticultural systems? Acta Horticulturae (1018). pp. 425-433. ISSN 0567-7572

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Article Link(s): http://www.actahort.org/books/1018/1018_46.htm

Abstract

There is a need to develop indicators that relate the dynamics of soil organic carbon (SOC) with changes in land management of horticultural production systems. Soil nematode communities have been shown to be sensitive to land management changes, but often do not include plant-parasites in the calculation of soil nematode community indices. The concept of nematode functional guilds was used to estimate the proportion of carbon entering the soil ecosystem through different channels, such as through decomposition of organic material, the detrital channel, through the roots of plants, the root channel or recycled through the activity of predators, a predation channel. Calculations of the indices were developed and validated using case studies in the north Queensland banana industry. Firstly, a survey of organic and conventional banana farms found a greater proportion of C entering the soil ecosystem through the detrital channel and a reduced proportion of C originating through the root channel at the organic sites relative to conventional sites. Secondly, a field experiment comparing compost amendments, found application of fresh compost significantly increased the proportion of C entering the soil ecosystem through the detrital channel and decreased proportion of C originating from the root channel. Thirdly, a field experiment comparing 'conventional' banana production to an 'alternative' system which incorporated organic matter, found the proportion of C entering the soil ecosystem through the root channel was significantly greater in the conventional systems relative to the alternative system. This research demonstrates that nematode indices can be used to assess horticultural systems, by indicating the origins of SOC.

Item Type:Article
Business groups:Horticulture and Forestry Science
Additional Information:I International Symposium on Organic Matter Management and Compost Use in Horticulture, Adelaide, South Australia, Australia.
Subjects:Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Plant culture > Fruit and fruit culture > Culture of individual fruits or types of fruit > Bananas
Agriculture > Agriculture (General) > Soils. Soil science
Deposited On:19 Aug 2014 02:11
Last Modified:19 Aug 2014 02:11

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