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31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol
Evaluation of soil organic carbon (SOC) dynamics is often limited by the complexity of soil matrix. Quantitative information on the distribution of SOC within aggregate hierarchy will help elucidate the carbon flow in soil matrix. However, this knowledge still needs to be documented. Soils were samp...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7271157/ https://www.ncbi.nlm.nih.gov/pubmed/32493974 http://dx.doi.org/10.1038/s41598-020-66038-1 |
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author | Sheng, Ming Han, Xiaozeng Zhang, Yihe Long, Jinghong Li, Na |
author_facet | Sheng, Ming Han, Xiaozeng Zhang, Yihe Long, Jinghong Li, Na |
author_sort | Sheng, Ming |
collection | PubMed |
description | Evaluation of soil organic carbon (SOC) dynamics is often limited by the complexity of soil matrix. Quantitative information on the distribution of SOC within aggregate hierarchy will help elucidate the carbon flow in soil matrix. However, this knowledge still needs to be documented. Soils were sampled from a surface Mollisol with plots under 100 years of continuous cropping, 31 years of simulated overgrazing to severely degraded bareland, and grassland restoration from cropped soil. A combined density and chemical fractionation procedure within water-stable aggregate was utilized to quantify the distribution of OC after long-term different land use patterns. Results showed that grassland significantly increased total SOC and mean aggregate associated OC compared to initial soil in 1985 with total SOC (g kg(−1) soil) from 46.1 to 31.7 and mean aggregate associated OC (g kg(−1) aggregate) from 31.6 to 44.7. Converting cropland to grassland also enhanced the formation of macroaggregates (>0.25 mm) (from 34.7% to 52.2%) and increased the OC concentrations in density and humic fractions by 48.3%-75.9% within aggregates. But the proportions of OC in density and humic fractions to SOC only increased in macroaggregates in grassland. Alternatively, converting cropland to bareland caused substantial depletion of total SOC, macroaggregates and their associated OC concentrations. The SOC (g kg(−1) soil) and mean aggregate associated OC (g kg(−1) aggregate) significantly decreased from 31.7 to 25.7 and from 31.6 to 26.2, respectively. While the OC concentration of density and humic fractions within aggregates in bareland did not show significant decreases. Principal component analysis demonstrated that the soils were developed by contrasting land use changes, with the grassland soil being more associated with labile OC fractions within macroaggregats and bareland soil more associated with recalcitrant OC fractions within microaggregates and silt-clay units. These findings highlighted the favorable preservation of plant-derived carbon within soil aggregates, particularly in the labile OC fractions within macroaggregates under high plant inputs with 31 years of grassland conversion. For the cropland and bareland soils without organic inputs, more OC was stabilized within fine aggregates via organo-mineral interactions, tending to be more recalcitrant. |
format | Online Article Text |
id | pubmed-7271157 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-72711572020-06-05 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol Sheng, Ming Han, Xiaozeng Zhang, Yihe Long, Jinghong Li, Na Sci Rep Article Evaluation of soil organic carbon (SOC) dynamics is often limited by the complexity of soil matrix. Quantitative information on the distribution of SOC within aggregate hierarchy will help elucidate the carbon flow in soil matrix. However, this knowledge still needs to be documented. Soils were sampled from a surface Mollisol with plots under 100 years of continuous cropping, 31 years of simulated overgrazing to severely degraded bareland, and grassland restoration from cropped soil. A combined density and chemical fractionation procedure within water-stable aggregate was utilized to quantify the distribution of OC after long-term different land use patterns. Results showed that grassland significantly increased total SOC and mean aggregate associated OC compared to initial soil in 1985 with total SOC (g kg(−1) soil) from 46.1 to 31.7 and mean aggregate associated OC (g kg(−1) aggregate) from 31.6 to 44.7. Converting cropland to grassland also enhanced the formation of macroaggregates (>0.25 mm) (from 34.7% to 52.2%) and increased the OC concentrations in density and humic fractions by 48.3%-75.9% within aggregates. But the proportions of OC in density and humic fractions to SOC only increased in macroaggregates in grassland. Alternatively, converting cropland to bareland caused substantial depletion of total SOC, macroaggregates and their associated OC concentrations. The SOC (g kg(−1) soil) and mean aggregate associated OC (g kg(−1) aggregate) significantly decreased from 31.7 to 25.7 and from 31.6 to 26.2, respectively. While the OC concentration of density and humic fractions within aggregates in bareland did not show significant decreases. Principal component analysis demonstrated that the soils were developed by contrasting land use changes, with the grassland soil being more associated with labile OC fractions within macroaggregats and bareland soil more associated with recalcitrant OC fractions within microaggregates and silt-clay units. These findings highlighted the favorable preservation of plant-derived carbon within soil aggregates, particularly in the labile OC fractions within macroaggregates under high plant inputs with 31 years of grassland conversion. For the cropland and bareland soils without organic inputs, more OC was stabilized within fine aggregates via organo-mineral interactions, tending to be more recalcitrant. Nature Publishing Group UK 2020-06-03 /pmc/articles/PMC7271157/ /pubmed/32493974 http://dx.doi.org/10.1038/s41598-020-66038-1 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Sheng, Ming Han, Xiaozeng Zhang, Yihe Long, Jinghong Li, Na 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title_full | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title_fullStr | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title_full_unstemmed | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title_short | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol |
title_sort | 31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a mollisol |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7271157/ https://www.ncbi.nlm.nih.gov/pubmed/32493974 http://dx.doi.org/10.1038/s41598-020-66038-1 |
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