Soil organic carbon cycling in response to simulated soil moisture variation under field conditions

Abstract The combination of extended dry periods and high intensity rainfall, common in the southeastern US, leads to greater variability in soil moisture and consequently increases uncertainty to microbial processes pertinent to soil carbon (C) mineralization. However, field-based findings on soil...

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Autores principales:	Shikha Singh, Melanie A. Mayes, Avat Shekoofa, Stephanie N. Kivlin, Sangeeta Bansal, Sindhu Jagadamma
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bb2337cca0b046158f96edcc18807d94
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spelling	oai:doaj.org-article:bb2337cca0b046158f96edcc18807d942021-12-02T15:49:43ZSoil organic carbon cycling in response to simulated soil moisture variation under field conditions10.1038/s41598-021-90359-42045-2322https://doaj.org/article/bb2337cca0b046158f96edcc18807d942021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90359-4https://doaj.org/toc/2045-2322Abstract The combination of extended dry periods and high intensity rainfall, common in the southeastern US, leads to greater variability in soil moisture and consequently increases uncertainty to microbial processes pertinent to soil carbon (C) mineralization. However, field-based findings on soil moisture sensitivity to soil C cycling are very limited. Therefore, a field experiment was conducted in 2018 and 2019 on a soybean (Glycine max L.) cropland in the southeastern US with three soil moisture treatments: drought (simulated using rainout-shelter from June to October in each year), rainfed (natural precipitation), and irrigated (irrigation and precipitation). Soil respiration was measured weekly from May to November in both years. Soil samples were collected multiple times each year from 0–5, 5–15, and 15–30 cm depths to determine microbial biomass C (MBC), extractable organic C (EOC), hydrolytic enzyme activities, and fungal abundance. The cumulative respiration under drought compared to other treatments was lower by 32% to 33% in 2018 and 38% to 45% in 2019. Increased MBC, EOC, and fungal abundance were observed under drought than other treatments. Specific enzyme activity indicated fewer metabolically active microbes under drought treatment compared to rainfed and irrigated treatments. Also, maintenance of enzyme pool was observed under drought condition. These results provide critical insights on microbial metabolism in response to soil moisture variation and how that influences different pools of soil C under field conditions.Shikha SinghMelanie A. MayesAvat ShekoofaStephanie N. KivlinSangeeta BansalSindhu JagadammaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shikha Singh Melanie A. Mayes Avat Shekoofa Stephanie N. Kivlin Sangeeta Bansal Sindhu Jagadamma Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
description	Abstract The combination of extended dry periods and high intensity rainfall, common in the southeastern US, leads to greater variability in soil moisture and consequently increases uncertainty to microbial processes pertinent to soil carbon (C) mineralization. However, field-based findings on soil moisture sensitivity to soil C cycling are very limited. Therefore, a field experiment was conducted in 2018 and 2019 on a soybean (Glycine max L.) cropland in the southeastern US with three soil moisture treatments: drought (simulated using rainout-shelter from June to October in each year), rainfed (natural precipitation), and irrigated (irrigation and precipitation). Soil respiration was measured weekly from May to November in both years. Soil samples were collected multiple times each year from 0–5, 5–15, and 15–30 cm depths to determine microbial biomass C (MBC), extractable organic C (EOC), hydrolytic enzyme activities, and fungal abundance. The cumulative respiration under drought compared to other treatments was lower by 32% to 33% in 2018 and 38% to 45% in 2019. Increased MBC, EOC, and fungal abundance were observed under drought than other treatments. Specific enzyme activity indicated fewer metabolically active microbes under drought treatment compared to rainfed and irrigated treatments. Also, maintenance of enzyme pool was observed under drought condition. These results provide critical insights on microbial metabolism in response to soil moisture variation and how that influences different pools of soil C under field conditions.
format	article
author	Shikha Singh Melanie A. Mayes Avat Shekoofa Stephanie N. Kivlin Sangeeta Bansal Sindhu Jagadamma
author_facet	Shikha Singh Melanie A. Mayes Avat Shekoofa Stephanie N. Kivlin Sangeeta Bansal Sindhu Jagadamma
author_sort	Shikha Singh
title	Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
title_short	Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
title_full	Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
title_fullStr	Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
title_full_unstemmed	Soil organic carbon cycling in response to simulated soil moisture variation under field conditions
title_sort	soil organic carbon cycling in response to simulated soil moisture variation under field conditions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bb2337cca0b046158f96edcc18807d94
work_keys_str_mv	AT shikhasingh soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions AT melanieamayes soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions AT avatshekoofa soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions AT stephanienkivlin soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions AT sangeetabansal soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions AT sindhujagadamma soilorganiccarboncyclinginresponsetosimulatedsoilmoisturevariationunderfieldconditions
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Soil organic carbon cycling in response to simulated soil moisture variation under field conditions

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