Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis

Abstract When studying carbon (C) sequestration in soil, it is necessary to recognize the maximal storage potential and the main influencing factors, including the climate, land use, and soil properties. Here, we hypothesized that the silt and clay contents in soils as well as the clay mineralogy ar...

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Autor principal:	Francisco J. Matus
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dc6658b185fe483fb82c4fc1bf68583a
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spelling	oai:doaj.org-article:dc6658b185fe483fb82c4fc1bf68583a2021-12-02T11:39:43ZFine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis10.1038/s41598-021-84821-62045-2322https://doaj.org/article/dc6658b185fe483fb82c4fc1bf68583a2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84821-6https://doaj.org/toc/2045-2322Abstract When studying carbon (C) sequestration in soil, it is necessary to recognize the maximal storage potential and the main influencing factors, including the climate, land use, and soil properties. Here, we hypothesized that the silt and clay contents in soils as well as the clay mineralogy are the main factors affecting the maximal C and N storage levels of soils. This hypothesis was evaluated using a database containing the organic C contents of topsoils separated by ultrasonic dispersion to determine the particle size fractions. The slopes of the linear regressions between the C contents in silt and clay to the soil organic C (SOC) and between the N contents in silt and clay to the total N content were independent of the clay mineralogy (2:1, 1:1, calcareous soil, amorphous clays), climate type (tropical, temperate, and Mediterranean), and land use type (cropland, grassland, and forest). This clearly shows that the silt and clay content is the main factor defining an upper SOC level, which allowed us to propose a generalized linear regression (R2 > 0.95) model with a common slope, independent of the land use and climate type, to estimate the soil C sequestration potential. The implications of these findings are as follows: (1) a common slope regression was accurately calculated (0.83 ± 0.02 for C-silt + clay < 63 μm and 0.81 ± 0.02 for C-silt + clay < 20 μm) and (2) there was no asymptotic pattern found to support the existence of an SOC saturation pool.Francisco J. MatusNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Francisco J. Matus Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
description	Abstract When studying carbon (C) sequestration in soil, it is necessary to recognize the maximal storage potential and the main influencing factors, including the climate, land use, and soil properties. Here, we hypothesized that the silt and clay contents in soils as well as the clay mineralogy are the main factors affecting the maximal C and N storage levels of soils. This hypothesis was evaluated using a database containing the organic C contents of topsoils separated by ultrasonic dispersion to determine the particle size fractions. The slopes of the linear regressions between the C contents in silt and clay to the soil organic C (SOC) and between the N contents in silt and clay to the total N content were independent of the clay mineralogy (2:1, 1:1, calcareous soil, amorphous clays), climate type (tropical, temperate, and Mediterranean), and land use type (cropland, grassland, and forest). This clearly shows that the silt and clay content is the main factor defining an upper SOC level, which allowed us to propose a generalized linear regression (R2 > 0.95) model with a common slope, independent of the land use and climate type, to estimate the soil C sequestration potential. The implications of these findings are as follows: (1) a common slope regression was accurately calculated (0.83 ± 0.02 for C-silt + clay < 63 μm and 0.81 ± 0.02 for C-silt + clay < 20 μm) and (2) there was no asymptotic pattern found to support the existence of an SOC saturation pool.
format	article
author	Francisco J. Matus
author_facet	Francisco J. Matus
author_sort	Francisco J. Matus
title	Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
title_short	Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
title_full	Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
title_fullStr	Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
title_full_unstemmed	Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis
title_sort	fine silt and clay content is the main factor defining maximal c and n accumulations in soils: a meta-analysis
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/dc6658b185fe483fb82c4fc1bf68583a
work_keys_str_mv	AT franciscojmatus finesiltandclaycontentisthemainfactordefiningmaximalcandnaccumulationsinsoilsametaanalysis
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Fine silt and clay content is the main factor defining maximal C and N accumulations in soils: a meta-analysis

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