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000887707 1001_ $$0P:(DE-HGF)0$$aSenbayram, Mehmet$$b0
000887707 245__ $$aRhizosphere processes in nitrate-rich barley soil tripled both N2O and N2 losses due to enhanced bacterial and fungal denitrification
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000887707 520__ $$aBackground and aimsPlants can directly affect nitrogen (N) transformation processes at the micro-ecological scale when soil comes into contact with roots. Due to the methodological limitations in measuring direct N2 losses in plant-soil systems, however, the effect of rhizosphere processes on N2O production and reduction to N2 has rarely been quantified.MethodsFor the first time, we developed a robotic continuous flow plant-soil incubation system (using a He+O2 + CO2) combined with N2O 15N site preference approach to examine the effect of plant root activity (barley – Hordeum vulgare L.) on: i) soil-borne N2O and N2 emissions, ii) the specific contribution of different pathways to N2O fluxes in moist soils (85% water holding capacity) receiving different inorganic N forms.ResultsOur results showed that when a nitrate-based N fertiliser was applied, the presence of plants tripled both N2O and N2 losses during the growth period but did not alter the N2O/(N2O + N2) product ratio. The 15N site preference data indicated that bacterial denitrification was the dominant source contributing to the observed N2O fluxes in both nitrate and ammonium treated soils, whereas the presence of barley increased the contribution of fungal N2O in the nitrate treated soils. During the post-harvest period, N2O and N2 emissions significantly increased in the ammonium-fertilised treatment, being more pronounced in the soil with a senescing root system.ConclusionOverall, our study showed a significant interaction between rhizosphere processes and N forms on the magnitude, patterns, and sources of soil borne N2O and N2 emissions in moist agricultural soils.
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000887707 7001_ $$0P:(DE-HGF)0$$aWell, Reinhard$$b1
000887707 7001_ $$0P:(DE-HGF)0$$aShan, Jun$$b2
000887707 7001_ $$0P:(DE-Juel1)145865$$aBol, Roland$$b3
000887707 7001_ $$0P:(DE-HGF)0$$aBurkart, Stefan$$b4
000887707 7001_ $$0P:(DE-HGF)0$$aJones, David L.$$b5
000887707 7001_ $$00000-0002-8005-2569$$aWu, Di$$b6$$eCorresponding author
000887707 773__ $$0PERI:(DE-600)1478535-3$$a10.1007/s11104-020-04457-9$$gVol. 448, no. 1-2, p. 509 - 522$$n1-2$$p509 - 522$$tPlant and soil$$v448$$x1573-5036$$y2020
000887707 8564_ $$uhttps://juser.fz-juelich.de/record/887707/files/Senbayram..Wu_et_al.-plant%20and%20soil-R1-Nontracked%20%28003%29.pdf$$yPublished on 2020-02-18. Available in OpenAccess from 2021-02-18.
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