Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 493912
Title Root exudates can control soil N dynamics
Author(s) Langarica Fuentes, A.; Mitchell, S.; Manrubia Freixa, M.; Daniell, T.
Source In: Proceedings of Rhizosphere 4 Conference Stretching the Interface of Life. - - p. 168 - 168.
Event Rhizosphere 4, Maastricht, 2015-06-21/2015-06-25
Department(s) Laboratory of Nematology
Publication type Abstract in scientific journal or proceedings
Publication year 2015
Abstract Agriculture represents the dominant source of the potent greenhouse gas nitrous oxide (N2O). This is largely due to the conversion of added nitrogen-based fertiliser through the action of the microbial nitrogen cycle in soil. Denitrification represents the main source of nitrous oxide emission and is a carbon driven process, as it maintains respiration under low oxygen conditions with nitrogen oxides acting as alternative electron acceptors. Initial experiments using barley plants (Hordeum vulgare) indicated that different cultivars support significant variation in N2O emission from denitrification from associated soil and that these effects are connected to root exudation difference rather than direct interaction or litter effects. In this study, a controlled microcosm experiment was designed to explore the interaction between root exudation and denitrification in terms of N2O production and community dynamics. Different quantities of artificial root exudates were added daily to soil at three different water regimes. N2O emissions were measured and community dynamics were assessed using T-RFLP and real time PCR. Results suggest that N2O emissions are driven by nitrous oxide reductase activity (consumption) rather than nitrite reductase activity (production). Soil condition, through differential aerobic status and variability, also appeared to have a marked effect both on flux through denitrification and community dynamics. Further work is underway to dissect the role of exudation quality in driving the alteration in nitrogen cycle flux and the end product of denitrification.
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