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Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest

The microbial decomposition respiration of plant litter generates a major CO(2) efflux from terrestrial ecosystems that plays a critical role in the regulation of carbon cycling on regional and global scales. However, the respiration from root litter decomposition and its sensitivity to temperature...

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Autores principales: Makita, Naoki, Kawamura, Ayumi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4319921/
https://www.ncbi.nlm.nih.gov/pubmed/25658106
http://dx.doi.org/10.1371/journal.pone.0117694
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author Makita, Naoki
Kawamura, Ayumi
author_facet Makita, Naoki
Kawamura, Ayumi
author_sort Makita, Naoki
collection PubMed
description The microbial decomposition respiration of plant litter generates a major CO(2) efflux from terrestrial ecosystems that plays a critical role in the regulation of carbon cycling on regional and global scales. However, the respiration from root litter decomposition and its sensitivity to temperature changes are unclear in current models of carbon turnover in forest soils. Thus, we examined seasonal changes in the temperature sensitivity and decomposition rates of fine root litter of two diameter classes (0–0.5 and 0.5–2.0 mm) of Quercus serrata and Ilex pedunculosa in a deciduous broad-leaved forest. During the study period, fine root litter of both diameter classes and species decreased approximately exponentially over time. The Q (10) values of microbial respiration rates of root litter for the two classes were 1.59–3.31 and 1.28–6.27 for Q. serrata and 1.36–6.31 and 1.65–5.86 for I. pedunculosa. A significant difference in Q (10) was observed between the diameter classes, indicating that root diameter represents the initial substrate quality, which may determine the magnitude of Q (10) value of microbial respiration. Changes in these Q (10) values were related to seasonal soil temperature patterns; the values were higher in winter than in summer. Moreover, seasonal variations in Q (10) were larger during the 2-year decomposition period than the 1-year period. These results showed that the Q (10) values of fine root litter of 0–0.5 and 0.5–2.0 mm have been shown to increase with lower temperatures and with the higher recalcitrance pool of the decomposed substrate during 2 years of decomposition. Thus, the temperature sensitivity of microbial respiration in root litter showed distinct patterns according to the decay period and season because of the temperature acclimation and adaptation of the microbial decomposer communities in root litter.
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spelling pubmed-43199212015-02-18 Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest Makita, Naoki Kawamura, Ayumi PLoS One Research Article The microbial decomposition respiration of plant litter generates a major CO(2) efflux from terrestrial ecosystems that plays a critical role in the regulation of carbon cycling on regional and global scales. However, the respiration from root litter decomposition and its sensitivity to temperature changes are unclear in current models of carbon turnover in forest soils. Thus, we examined seasonal changes in the temperature sensitivity and decomposition rates of fine root litter of two diameter classes (0–0.5 and 0.5–2.0 mm) of Quercus serrata and Ilex pedunculosa in a deciduous broad-leaved forest. During the study period, fine root litter of both diameter classes and species decreased approximately exponentially over time. The Q (10) values of microbial respiration rates of root litter for the two classes were 1.59–3.31 and 1.28–6.27 for Q. serrata and 1.36–6.31 and 1.65–5.86 for I. pedunculosa. A significant difference in Q (10) was observed between the diameter classes, indicating that root diameter represents the initial substrate quality, which may determine the magnitude of Q (10) value of microbial respiration. Changes in these Q (10) values were related to seasonal soil temperature patterns; the values were higher in winter than in summer. Moreover, seasonal variations in Q (10) were larger during the 2-year decomposition period than the 1-year period. These results showed that the Q (10) values of fine root litter of 0–0.5 and 0.5–2.0 mm have been shown to increase with lower temperatures and with the higher recalcitrance pool of the decomposed substrate during 2 years of decomposition. Thus, the temperature sensitivity of microbial respiration in root litter showed distinct patterns according to the decay period and season because of the temperature acclimation and adaptation of the microbial decomposer communities in root litter. Public Library of Science 2015-02-06 /pmc/articles/PMC4319921/ /pubmed/25658106 http://dx.doi.org/10.1371/journal.pone.0117694 Text en © 2015 Makita, Kawamura http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Makita, Naoki
Kawamura, Ayumi
Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title_full Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title_fullStr Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title_full_unstemmed Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title_short Temperature Sensitivity of Microbial Respiration of Fine Root Litter in a Temperate Broad-Leaved Forest
title_sort temperature sensitivity of microbial respiration of fine root litter in a temperate broad-leaved forest
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4319921/
https://www.ncbi.nlm.nih.gov/pubmed/25658106
http://dx.doi.org/10.1371/journal.pone.0117694
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