Contribution of decomposing plant roots to N2O emissions by water absorption

[Display omitted] •Decomposing soybean roots absorbed soil moisture, creating N2O hotspots.•Soil near decomposing roots contained higher water level compared to bulk soil.•At 50% WFPS, N2O emissions rose by 185% in large pores compared to small pores. The “sponge effect”, or water absorption by inco...

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Bibliographic Details
Published in:Geoderma 2020-10, Vol.375 (C), p.114506, Article 114506
Main Authors: Kim, Kyungmin, Guber, Andrey, Rivers, Mark, Kravchenko, Alexandra
Format: Article
Language:English
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Summary:[Display omitted] •Decomposing soybean roots absorbed soil moisture, creating N2O hotspots.•Soil near decomposing roots contained higher water level compared to bulk soil.•At 50% WFPS, N2O emissions rose by 185% in large pores compared to small pores. The “sponge effect”, or water absorption by incorporated plant leaf residues, was recently identified as one of the mechanisms that drives activity in microbial hotspots. We explored the presence of the sponge effect in plant root residues, and its role in root decomposition and associated N2O and CO2 emissions. Young soybean (Glycine max) plants were grown in microcosms with two soil materials dominated by (i) large (>30 μm Ø) and (ii) small (
ISSN:0016-7061
1872-6259
DOI:10.1016/j.geoderma.2020.114506