Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol

Tillage and straw incorporation are important agricultural practices that can break the plow layer and improve Mollisol fertility. The effect of these practices on the limitation of resources for soil microorganisms, however, is unclear. We established a field experiment in 2018 and collection of so...

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Autores principales:	Naiwen Zhang, Xu Chen, Xiaozeng Han, Xinchun Lu, Jun Yan, Wenxiu Zou, Lei Yan
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	ecoenzymatic stoichiometry tillage management straw incorporation nutrient acquisition Chinese Mollisol Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/efc46d3d4ae94aa1bedec4ffc9f0e300
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spelling	oai:doaj.org-article:efc46d3d4ae94aa1bedec4ffc9f0e3002021-12-01T18:54:25ZResponses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol2296-665X10.3389/fenvs.2021.737075https://doaj.org/article/efc46d3d4ae94aa1bedec4ffc9f0e3002021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenvs.2021.737075/fullhttps://doaj.org/toc/2296-665XTillage and straw incorporation are important agricultural practices that can break the plow layer and improve Mollisol fertility. The effect of these practices on the limitation of resources for soil microorganisms, however, is unclear. We established a field experiment in 2018 and collection of soil samples in 2020 to study the acquisition of resources by microbes in a Mollisol region in northeastern China. Four treatments were studied: conventional tillage (CT), straw incorporation with conventional tillage (SCT), subsoil tillage (ST) and straw incorporation with subsoil tillage (SST). The limitation of resources for soil microorganisms was assessed using models of extracellular enzymatic stoichiometry. The soil microbes were generally colimited by C and P but not N. The degree of limitation, however, varied among the treatments. SCT and SST alleviated microbial P limitation in the 0–15 and 15–35 cm layers, respectively, but ST did not significantly affect P limitation relative to CT. Interestingly, N-resource contents were strongly correlated with indicators of C and P limitation. A random forest analysis found that the contents of available N and total dissolved N were the most important factors for microbial C and P limitation, respectively. Straw incorporation alleviated microbial P limitation but did not eliminate P limitation and deep tillage aggravate microbial C limitation. We suggest that N fertilization may be reduced due to the N-rich characteristics of the Mollisols in northeastern China.Naiwen ZhangNaiwen ZhangXu ChenXiaozeng HanXinchun LuJun YanWenxiu ZouLei YanFrontiers Media S.A.articleecoenzymatic stoichiometrytillage managementstraw incorporationnutrient acquisitionChinese MollisolEnvironmental sciencesGE1-350ENFrontiers in Environmental Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ecoenzymatic stoichiometry tillage management straw incorporation nutrient acquisition Chinese Mollisol Environmental sciences GE1-350
spellingShingle	ecoenzymatic stoichiometry tillage management straw incorporation nutrient acquisition Chinese Mollisol Environmental sciences GE1-350 Naiwen Zhang Naiwen Zhang Xu Chen Xiaozeng Han Xinchun Lu Jun Yan Wenxiu Zou Lei Yan Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
description	Tillage and straw incorporation are important agricultural practices that can break the plow layer and improve Mollisol fertility. The effect of these practices on the limitation of resources for soil microorganisms, however, is unclear. We established a field experiment in 2018 and collection of soil samples in 2020 to study the acquisition of resources by microbes in a Mollisol region in northeastern China. Four treatments were studied: conventional tillage (CT), straw incorporation with conventional tillage (SCT), subsoil tillage (ST) and straw incorporation with subsoil tillage (SST). The limitation of resources for soil microorganisms was assessed using models of extracellular enzymatic stoichiometry. The soil microbes were generally colimited by C and P but not N. The degree of limitation, however, varied among the treatments. SCT and SST alleviated microbial P limitation in the 0–15 and 15–35 cm layers, respectively, but ST did not significantly affect P limitation relative to CT. Interestingly, N-resource contents were strongly correlated with indicators of C and P limitation. A random forest analysis found that the contents of available N and total dissolved N were the most important factors for microbial C and P limitation, respectively. Straw incorporation alleviated microbial P limitation but did not eliminate P limitation and deep tillage aggravate microbial C limitation. We suggest that N fertilization may be reduced due to the N-rich characteristics of the Mollisols in northeastern China.
format	article
author	Naiwen Zhang Naiwen Zhang Xu Chen Xiaozeng Han Xinchun Lu Jun Yan Wenxiu Zou Lei Yan
author_facet	Naiwen Zhang Naiwen Zhang Xu Chen Xiaozeng Han Xinchun Lu Jun Yan Wenxiu Zou Lei Yan
author_sort	Naiwen Zhang
title	Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
title_short	Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
title_full	Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
title_fullStr	Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
title_full_unstemmed	Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol
title_sort	responses of microbial nutrient acquisition to depth of tillage and incorporation of straw in a chinese mollisol
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/efc46d3d4ae94aa1bedec4ffc9f0e300
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Responses of Microbial Nutrient Acquisition to Depth of Tillage and Incorporation of Straw in a Chinese Mollisol

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