Response of the chemical structure of soil organic carbon to modes of maize straw return

Abstract Elucidating the chemical structure of soil organic matter (SOM) is important for accurately evaluating the stability and function of SOM. Aboveground vegetation directly affects the quantity and quality of exogenous organic matter input into the soil through plant residues and root exudates...

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Autores principales:	Shuqing Zheng, Jiuming Zhang, Fengqin Chi, Baoku Zhou, Dan Wei, Enjun Kuang, Yu Jiang, Gang Mi, Yu ping Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b2a0e004da3b4dbebf459100b398811e
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spelling	oai:doaj.org-article:b2a0e004da3b4dbebf459100b398811e2021-12-02T17:04:05ZResponse of the chemical structure of soil organic carbon to modes of maize straw return10.1038/s41598-021-84697-62045-2322https://doaj.org/article/b2a0e004da3b4dbebf459100b398811e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84697-6https://doaj.org/toc/2045-2322Abstract Elucidating the chemical structure of soil organic matter (SOM) is important for accurately evaluating the stability and function of SOM. Aboveground vegetation directly affects the quantity and quality of exogenous organic matter input into the soil through plant residues and root exudates, which in turn affects soil microbial species, community structure, and activity, and ultimately impacts the chemical structure of SOM. In this study, a 13C nuclear magnetic resonance technique was used to analyze the chemical structure characteristics of soil organic carbon (SOC) under various rates of straw returning combined with rotary tillage and under full straw mulching. The results showed that full straw returning with rotary tillage and full straw mulching more effectively increased the SOC content than reduced rate of straw returning (1/2 and 1/3 of full straw) with rotary tillage. The contents of alkyl C and alkoxy C in the functional groups of SOC under various straw returning treatments were increased compared with those under the treatment of maize stubble remaining in soil (CK). Furthermore, the contents of aromatic C and carboxyl C were decreased, which were consistent with the chemical shift changes of SOC. Compared with CK treatment, straw returning decreased the content of aromatic C in the functional groups of SOC, but increased the content of alkoxy C, which could be associated with the change in integral areas of absorption peaks of alkyl C and alkoxy C moving toward left and right, respectively. The content of total SOC was significantly positively (P < 0.05) correlated with that of alkoxy C and significantly negatively (P < 0.01) correlated with that of aromatic C. The molecular structure of SOC tends to be simplified due to the decreasing in refractory C and the increasing in easily decomposed C after straw returning to the field.Shuqing ZhengJiuming ZhangFengqin ChiBaoku ZhouDan WeiEnjun KuangYu JiangGang MiYu ping ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shuqing Zheng Jiuming Zhang Fengqin Chi Baoku Zhou Dan Wei Enjun Kuang Yu Jiang Gang Mi Yu ping Chen Response of the chemical structure of soil organic carbon to modes of maize straw return
description	Abstract Elucidating the chemical structure of soil organic matter (SOM) is important for accurately evaluating the stability and function of SOM. Aboveground vegetation directly affects the quantity and quality of exogenous organic matter input into the soil through plant residues and root exudates, which in turn affects soil microbial species, community structure, and activity, and ultimately impacts the chemical structure of SOM. In this study, a 13C nuclear magnetic resonance technique was used to analyze the chemical structure characteristics of soil organic carbon (SOC) under various rates of straw returning combined with rotary tillage and under full straw mulching. The results showed that full straw returning with rotary tillage and full straw mulching more effectively increased the SOC content than reduced rate of straw returning (1/2 and 1/3 of full straw) with rotary tillage. The contents of alkyl C and alkoxy C in the functional groups of SOC under various straw returning treatments were increased compared with those under the treatment of maize stubble remaining in soil (CK). Furthermore, the contents of aromatic C and carboxyl C were decreased, which were consistent with the chemical shift changes of SOC. Compared with CK treatment, straw returning decreased the content of aromatic C in the functional groups of SOC, but increased the content of alkoxy C, which could be associated with the change in integral areas of absorption peaks of alkyl C and alkoxy C moving toward left and right, respectively. The content of total SOC was significantly positively (P < 0.05) correlated with that of alkoxy C and significantly negatively (P < 0.01) correlated with that of aromatic C. The molecular structure of SOC tends to be simplified due to the decreasing in refractory C and the increasing in easily decomposed C after straw returning to the field.
format	article
author	Shuqing Zheng Jiuming Zhang Fengqin Chi Baoku Zhou Dan Wei Enjun Kuang Yu Jiang Gang Mi Yu ping Chen
author_facet	Shuqing Zheng Jiuming Zhang Fengqin Chi Baoku Zhou Dan Wei Enjun Kuang Yu Jiang Gang Mi Yu ping Chen
author_sort	Shuqing Zheng
title	Response of the chemical structure of soil organic carbon to modes of maize straw return
title_short	Response of the chemical structure of soil organic carbon to modes of maize straw return
title_full	Response of the chemical structure of soil organic carbon to modes of maize straw return
title_fullStr	Response of the chemical structure of soil organic carbon to modes of maize straw return
title_full_unstemmed	Response of the chemical structure of soil organic carbon to modes of maize straw return
title_sort	response of the chemical structure of soil organic carbon to modes of maize straw return
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b2a0e004da3b4dbebf459100b398811e
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Response of the chemical structure of soil organic carbon to modes of maize straw return

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