Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China

Abstract Rain-induced soil CO2 pulse, a rapid excitation in soil CO2 flux after rain, is ubiquitously observed in terrestrial ecosystems, yet the underlying mechanisms in tropical forests are still not clear. We conducted a rain simulation experiment to quantify rain-induced changes in soil CO2 flux...

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Autores principales:	Qi Deng, Dafeng Hui, Guowei Chu, Xi Han, Quanfa Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7a8aaf0a0b024f5eaa745e54b76bd539
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spelling	oai:doaj.org-article:7a8aaf0a0b024f5eaa745e54b76bd5392021-12-02T15:06:24ZRain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China10.1038/s41598-017-06345-22045-2322https://doaj.org/article/7a8aaf0a0b024f5eaa745e54b76bd5392017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06345-2https://doaj.org/toc/2045-2322Abstract Rain-induced soil CO2 pulse, a rapid excitation in soil CO2 flux after rain, is ubiquitously observed in terrestrial ecosystems, yet the underlying mechanisms in tropical forests are still not clear. We conducted a rain simulation experiment to quantify rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest. Soil CO2 flux rapidly increased by ~83% after rains, accompanied by increases in both bacterial (~51%) and fungal (~58%) Phospholipid Fatty Acids (PLFA) biomass. However, soil CO2 flux and microbial community in the plots without litters showed limited response to rains. Direct releases of CO2 from litter layer only accounted for ~19% increases in soil CO2 flux, suggesting that the leaching of dissolved organic carbon (DOC) from litter layer to the topsoil is the major cause of rain-induced soil CO2 pulse. In addition, rain-induced changes in soil CO2 flux and microbial PLFA biomass decreased with increasing rain sizes, but they were positively correlated with litter-leached DOC concentration rather than total DOC flux. Our findings reveal an important role of litter-leached DOC input in regulating rain-induced soil CO2 pulses and microbial community composition, and may have significant implications for CO2 losses from tropical forest soils under future rainfall changes.Qi DengDafeng HuiGuowei ChuXi HanQuanfa ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Qi Deng Dafeng Hui Guowei Chu Xi Han Quanfa Zhang Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
description	Abstract Rain-induced soil CO2 pulse, a rapid excitation in soil CO2 flux after rain, is ubiquitously observed in terrestrial ecosystems, yet the underlying mechanisms in tropical forests are still not clear. We conducted a rain simulation experiment to quantify rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest. Soil CO2 flux rapidly increased by ~83% after rains, accompanied by increases in both bacterial (~51%) and fungal (~58%) Phospholipid Fatty Acids (PLFA) biomass. However, soil CO2 flux and microbial community in the plots without litters showed limited response to rains. Direct releases of CO2 from litter layer only accounted for ~19% increases in soil CO2 flux, suggesting that the leaching of dissolved organic carbon (DOC) from litter layer to the topsoil is the major cause of rain-induced soil CO2 pulse. In addition, rain-induced changes in soil CO2 flux and microbial PLFA biomass decreased with increasing rain sizes, but they were positively correlated with litter-leached DOC concentration rather than total DOC flux. Our findings reveal an important role of litter-leached DOC input in regulating rain-induced soil CO2 pulses and microbial community composition, and may have significant implications for CO2 losses from tropical forest soils under future rainfall changes.
format	article
author	Qi Deng Dafeng Hui Guowei Chu Xi Han Quanfa Zhang
author_facet	Qi Deng Dafeng Hui Guowei Chu Xi Han Quanfa Zhang
author_sort	Qi Deng
title	Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
title_short	Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
title_full	Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
title_fullStr	Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
title_full_unstemmed	Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China
title_sort	rain-induced changes in soil co2 flux and microbial community composition in a tropical forest of china
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/7a8aaf0a0b024f5eaa745e54b76bd539
work_keys_str_mv	AT qideng raininducedchangesinsoilco2fluxandmicrobialcommunitycompositioninatropicalforestofchina AT dafenghui raininducedchangesinsoilco2fluxandmicrobialcommunitycompositioninatropicalforestofchina AT guoweichu raininducedchangesinsoilco2fluxandmicrobialcommunitycompositioninatropicalforestofchina AT xihan raininducedchangesinsoilco2fluxandmicrobialcommunitycompositioninatropicalforestofchina AT quanfazhang raininducedchangesinsoilco2fluxandmicrobialcommunitycompositioninatropicalforestofchina
_version_	1718388457603072000

Rain-induced changes in soil CO2 flux and microbial community composition in a tropical forest of China

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