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Nitrous oxide effluxes from plants as a potentially important source to the atmosphere. | LitMetric

AI Article Synopsis

Article Abstract

The global budget for nitrous oxide (N O), an important greenhouse gas and probably dominant ozone-depleting substance emitted in the 21 century, is far from being fully understood. Cycling of N O in terrestrial ecosystems has traditionally exclusively focused on gas exchange between the soil surface (nitrification-denitrification processes) and the atmosphere. Terrestrial vegetation has not been considered in the global budget so far, even though plants are known to release N O. Here, we report the N O emission rates of 32 plant species from 22 different families measured under controlled laboratory conditions. Furthermore, the first isotopocule values (δ N, δ O and δ N ) of N O emitted from plants were determined. A robust relationship established between N O emission and CO respiration rates, which did not alter significantly over a broad range of changing environmental conditions, was used to quantify plant-derived emissions on an ecosystem scale. Stable isotope measurements (δ N, δ O and δ N ) of N O emitted by plants clearly show that the dual isotopocule fingerprint of plant-derived N O differs from that of currently known microbial or chemical processes. Our work suggests that vegetation is a natural source of N O in the environment with a large fraction released by a hitherto unrecognized process.

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Source
http://dx.doi.org/10.1111/nph.15455DOI Listing

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