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Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period

In rice paddy, the closed chamber method is broadly used to estimate methane (CH(4)) emission rate. Since rice plants can significantly affect CH(4) production, oxidation and emission, rice plantation inside the chamber is standardized in IPCC guidelines. Methane emission rate is calculated using th...

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Autores principales: Lim, Ji Yeon, Cho, Song Rae, Kim, Gil Won, Kim, Pil Joo, Jeong, Seung Tak
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8452067/
https://www.ncbi.nlm.nih.gov/pubmed/34543286
http://dx.doi.org/10.1371/journal.pone.0256796
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author Lim, Ji Yeon
Cho, Song Rae
Kim, Gil Won
Kim, Pil Joo
Jeong, Seung Tak
author_facet Lim, Ji Yeon
Cho, Song Rae
Kim, Gil Won
Kim, Pil Joo
Jeong, Seung Tak
author_sort Lim, Ji Yeon
collection PubMed
description In rice paddy, the closed chamber method is broadly used to estimate methane (CH(4)) emission rate. Since rice plants can significantly affect CH(4) production, oxidation and emission, rice plantation inside the chamber is standardized in IPCC guidelines. Methane emission rate is calculated using the increased concentration inside the headspace. Biomass growth might decrease the headspace volume, and thus CH(4) emission rates might be overestimated. To evaluate the influence of chamber headspace decreased by rice plant development on CH(4) emission rates, five Korean rice cultivars were cultivated in a typical rice paddy, and physical volume changes in rice biomass were assayed using water displacement method. The recommended acrylic closed chambers (H. 1.2 m x W. 0.6 m x L. 0.6 m) were installed, and eight rice plants were transplanted inside the chamber with the same space interval with the outside. Biomass growth significantly decreased the headspace volume of the chamber. However, this volume covered only 0.48–0.55% of the closed chamber volume at the maximum growth stage. During the whole cropping period, mean 0.24–0.28% of chamber headspace was allocated by plant biomass, and thus this level of total CH(4) emissions was overestimated. However, this overestimation was much smaller than the errors coming from other investigation processes (i.e., chamber closing hour, temperature recording, inconstant flooding level, different soil environments, etc.) and rice physiological changes. In conclusion, the influence of physical biomass volume inside the closed chamber was negligible to make the error in total CH(4) emission assessment in rice paddies.
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spelling pubmed-84520672021-09-21 Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period Lim, Ji Yeon Cho, Song Rae Kim, Gil Won Kim, Pil Joo Jeong, Seung Tak PLoS One Research Article In rice paddy, the closed chamber method is broadly used to estimate methane (CH(4)) emission rate. Since rice plants can significantly affect CH(4) production, oxidation and emission, rice plantation inside the chamber is standardized in IPCC guidelines. Methane emission rate is calculated using the increased concentration inside the headspace. Biomass growth might decrease the headspace volume, and thus CH(4) emission rates might be overestimated. To evaluate the influence of chamber headspace decreased by rice plant development on CH(4) emission rates, five Korean rice cultivars were cultivated in a typical rice paddy, and physical volume changes in rice biomass were assayed using water displacement method. The recommended acrylic closed chambers (H. 1.2 m x W. 0.6 m x L. 0.6 m) were installed, and eight rice plants were transplanted inside the chamber with the same space interval with the outside. Biomass growth significantly decreased the headspace volume of the chamber. However, this volume covered only 0.48–0.55% of the closed chamber volume at the maximum growth stage. During the whole cropping period, mean 0.24–0.28% of chamber headspace was allocated by plant biomass, and thus this level of total CH(4) emissions was overestimated. However, this overestimation was much smaller than the errors coming from other investigation processes (i.e., chamber closing hour, temperature recording, inconstant flooding level, different soil environments, etc.) and rice physiological changes. In conclusion, the influence of physical biomass volume inside the closed chamber was negligible to make the error in total CH(4) emission assessment in rice paddies. Public Library of Science 2021-09-20 /pmc/articles/PMC8452067/ /pubmed/34543286 http://dx.doi.org/10.1371/journal.pone.0256796 Text en © 2021 Lim et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Lim, Ji Yeon
Cho, Song Rae
Kim, Gil Won
Kim, Pil Joo
Jeong, Seung Tak
Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title_full Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title_fullStr Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title_full_unstemmed Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title_short Uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
title_sort uncertainty of methane emissions coming from the physical volume of plant biomass inside the closed chamber was negligible during cropping period
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8452067/
https://www.ncbi.nlm.nih.gov/pubmed/34543286
http://dx.doi.org/10.1371/journal.pone.0256796
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