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@ARTICLE{Senbayram:887707,
author = {Senbayram, Mehmet and Well, Reinhard and Shan, Jun and Bol,
Roland and Burkart, Stefan and Jones, David L. and Wu, Di},
title = {{R}hizosphere processes in nitrate-rich barley soil tripled
both {N}2{O} and {N}2 losses due to enhanced bacterial and
fungal denitrification},
journal = {Plant and soil},
volume = {448},
number = {1-2},
issn = {1573-5036},
address = {Dordrecht [u.a.]},
publisher = {Springer Science + Business Media B.V},
reportid = {FZJ-2020-04364},
pages = {509 - 522},
year = {2020},
abstract = {Background 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.},
cin = {IBG-3},
ddc = {580},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000516246500001},
doi = {10.1007/s11104-020-04457-9},
url = {https://juser.fz-juelich.de/record/887707},
}