Substrate-induced volatile organic compound emissions from compost-amended soils |
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Authors: | Martin S A Seewald Wolfgang Singer Brigitte A Knapp Ingrid H Franke-Whittle Armin Hansel Heribert Insam |
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Institution: | 1. Universit?t Innsbruck, Innsbruck, Austria 2. Ionimed Analytik GmbH, Innsbruck, Austria
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Abstract: | The agronomic effects of composts, mineral fertiliser and combinations thereof on chemical, biological and physiological soil
properties have been studied in an 18-year field experiment. The present study aimed at tracing treatment effects by evaluating
the volatile organic compound (VOC) emission of the differently treated soils: non-amended control, nitrogen fertilisation
and composts (produced from organic waste and sewage sludge, respectively) in combination with nitrogen fertiliser. Microbial
community structure was determined by denaturing gradient gel electrophoresis (DGGE). Aerobic and anaerobic soil VOC emission
was determined after glucose amendment using proton transfer reaction–mass spectrometry (PTR-MS). After inducing VOC production
by substrate (glucose) addition and at the same time reducing oxygen availability to impair degradation of the produced VOCs,
we were able to differentiate among the treatments. Organic waste compost did not alter the VOC emissions compared to the
untreated control, whilst sewage sludge composts and mineral fertilisation showed distinct effects. This differentiation was
supported by DGGE analysis of fungal 18S rDNA fragments and confirms earlier findings on bacterial communities. Three major
conclusions can be drawn: (1) VOC patterns are able to discriminate among soil treatments. (2) Sewage sludge compost and mineral
fertilisation have not only the strongest impact on microbial community composition but also on VOC emission patterns, but
specific tracer VOCs could not be identified. (3) Future efforts should aim at a PTR-MS-linked identification of the detected
masses. |
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