Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China

Exploring the composition of soil organic carbon (SOC) and aggregate stability over a range of elevations is essential to evaluate the stability of SOC and the conversion of carbon source or sink of mountain ecosystems. However, information of those changes in mountain ecosystems in arid and semi-ar...

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Autores principales:	Mengyao Wu, Danbo Pang, Lin Chen, Xuebin Li, Lizhen Liu, Bo Liu, Jingyao Li, Jifei Wang, Longlong Ma
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Mountain ecosystem SOC Elevation gradient Aggregate stability 13C-CPMAS NMR Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/9453cd7dbf5a4b26bd9eca3469875d14
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spelling	oai:doaj.org-article:9453cd7dbf5a4b26bd9eca3469875d142021-12-01T05:00:55ZChemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China1470-160X10.1016/j.ecolind.2021.108228https://doaj.org/article/9453cd7dbf5a4b26bd9eca3469875d142021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008931https://doaj.org/toc/1470-160XExploring the composition of soil organic carbon (SOC) and aggregate stability over a range of elevations is essential to evaluate the stability of SOC and the conversion of carbon source or sink of mountain ecosystems. However, information of those changes in mountain ecosystems in arid and semi-arid regions is still scarce to date. In this study, we estimated the response of SOC stability along elevation gradient (1,380–2,438 m) by combining physical protection of aggregates with chemical protection of SOC using a redundancy analysis method in the Helan Mountains, northwest China. Results showed that the dominated aggregates of Helan Mountains changed from microaggregates to macroaggregates with increasing elevation, and the mean weight diameter (MWD) in mid and high elevations (2,139–2,248 m) was significantly higher than that in low elevations (1,380–1,650 m). Solid-state 13C NMR spectra showed that O-alkyl C was the main chemical composition of SOC in the different elevations. Regression analysis indicated that with the increase of elevation, the proportion of aromatic C and aromaticity gradually increased, peaked at the mid elevation and subsequently decreased. These findings indicated that the soil structure and chemical composition of SOC are more stable in the mid elevation. Macroaggregates were positively correlated with O-alkyl C and aromatic C, while silt and clay were positively correlated with alkyl C, indicative of a lower decomposition rate of macroaggregates. The RDA analysis confirmed that aggregate stability were significant associated with SOC content and chemical composition such as O-alkyl C, indicating that the soil labile carbon pool was most related to affect aggregate stability. Our findings suggest that the Helan Mountains had a better soil structure and a more stable SOC chemical composition at mid elevation ranges. The soil structure at low elevations is sensitive to environment change; therefore, a reduction in anthropogenic disturbance is suggested for improved sustainability of the ecosystem.Mengyao WuDanbo PangLin ChenXuebin LiLizhen LiuBo LiuJingyao LiJifei WangLonglong MaElsevierarticleMountain ecosystemSOCElevation gradientAggregate stability13C-CPMAS NMREcologyQH540-549.5ENEcological Indicators, Vol 131, Iss , Pp 108228- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mountain ecosystem SOC Elevation gradient Aggregate stability 13C-CPMAS NMR Ecology QH540-549.5
spellingShingle	Mountain ecosystem SOC Elevation gradient Aggregate stability 13C-CPMAS NMR Ecology QH540-549.5 Mengyao Wu Danbo Pang Lin Chen Xuebin Li Lizhen Liu Bo Liu Jingyao Li Jifei Wang Longlong Ma Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
description	Exploring the composition of soil organic carbon (SOC) and aggregate stability over a range of elevations is essential to evaluate the stability of SOC and the conversion of carbon source or sink of mountain ecosystems. However, information of those changes in mountain ecosystems in arid and semi-arid regions is still scarce to date. In this study, we estimated the response of SOC stability along elevation gradient (1,380–2,438 m) by combining physical protection of aggregates with chemical protection of SOC using a redundancy analysis method in the Helan Mountains, northwest China. Results showed that the dominated aggregates of Helan Mountains changed from microaggregates to macroaggregates with increasing elevation, and the mean weight diameter (MWD) in mid and high elevations (2,139–2,248 m) was significantly higher than that in low elevations (1,380–1,650 m). Solid-state 13C NMR spectra showed that O-alkyl C was the main chemical composition of SOC in the different elevations. Regression analysis indicated that with the increase of elevation, the proportion of aromatic C and aromaticity gradually increased, peaked at the mid elevation and subsequently decreased. These findings indicated that the soil structure and chemical composition of SOC are more stable in the mid elevation. Macroaggregates were positively correlated with O-alkyl C and aromatic C, while silt and clay were positively correlated with alkyl C, indicative of a lower decomposition rate of macroaggregates. The RDA analysis confirmed that aggregate stability were significant associated with SOC content and chemical composition such as O-alkyl C, indicating that the soil labile carbon pool was most related to affect aggregate stability. Our findings suggest that the Helan Mountains had a better soil structure and a more stable SOC chemical composition at mid elevation ranges. The soil structure at low elevations is sensitive to environment change; therefore, a reduction in anthropogenic disturbance is suggested for improved sustainability of the ecosystem.
format	article
author	Mengyao Wu Danbo Pang Lin Chen Xuebin Li Lizhen Liu Bo Liu Jingyao Li Jifei Wang Longlong Ma
author_facet	Mengyao Wu Danbo Pang Lin Chen Xuebin Li Lizhen Liu Bo Liu Jingyao Li Jifei Wang Longlong Ma
author_sort	Mengyao Wu
title	Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
title_short	Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
title_full	Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
title_fullStr	Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
title_full_unstemmed	Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China
title_sort	chemical composition of soil organic carbon and aggregate stability along an elevation gradient in helan mountains, northwest china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/9453cd7dbf5a4b26bd9eca3469875d14
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_version_	1718405614859714560

Chemical composition of soil organic carbon and aggregate stability along an elevation gradient in Helan Mountains, northwest China

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