Aggregation and organic matter in subarctic Andosols under different grassland management
Quantity and quality of soil organic matter (SOM) affect physical, chemical, and biological soil properties, and are pivotal to productive and healthy grasslands. Thus, we analyzed the distribution of soil aggregates and assessed quality, quantity, and distribution of SOM in two unimproved and impro...
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ftdatacite:10.6084/m9.figshare.1297062.v1 2023-05-15T16:52:00+02:00 Aggregation and organic matter in subarctic Andosols under different grassland management Lehtinen, Taru Lair, Georg J. Leeuwen, Jeroen P. Van Blum, Winfried E.H. Bloem, Jaap Steffens, Markus Gísladóttir, Guðrún Ragnarsdóttir, Kristín Vala 2015 https://dx.doi.org/10.6084/m9.figshare.1297062.v1 https://tandf.figshare.com/articles/journal_contribution/Aggregation_and_organic_matter_in_subarctic_Andosols_under_different_grassland_management/1297062/1 unknown Taylor & Francis https://dx.doi.org/10.1080/09064710.2014.1001778 https://dx.doi.org/10.6084/m9.figshare.1297062 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Biological Sciences Ecology FOS Biological sciences Chemistry Earth and Environmental Sciences Text article-journal Journal contribution ScholarlyArticle 2015 ftdatacite https://doi.org/10.6084/m9.figshare.1297062.v1 https://doi.org/10.1080/09064710.2014.1001778 https://doi.org/10.6084/m9.figshare.1297062 2021-11-05T12:55:41Z Quantity and quality of soil organic matter (SOM) affect physical, chemical, and biological soil properties, and are pivotal to productive and healthy grasslands. Thus, we analyzed the distribution of soil aggregates and assessed quality, quantity, and distribution of SOM in two unimproved and improved (two organic and two conventional) grasslands in subarctic Iceland, in Haplic and Histic Andosols. We also evaluated principal physicochemical and biological soil properties, which influence soil aggregation and SOM dynamics. Macroaggregates (>250 µm) in topsoils were most prominent in unimproved (62–77%) and organically (58–69%) managed sites, whereas 20–250 µm aggregates were the most prominent in conventionally managed sites (51–53%). Macroaggregate stability in topsoils, measured as mean weight diameter, was approximately twice as high in organically managed (12–20 mm) compared with the conventionally managed (5–8 mm) sites, possibly due to higher organic inputs (e.g., manure, compost, and cattle urine). In unimproved grasslands and one organic site, macroaggregates contributed between 40% and 70% of soil organic carbon (SOC) and nitrogen to bulk soil, whereas in high SOM concentration sites free particulate organic matter contributed up to 70% of the SOC and nitrogen to bulk soil. Aggregate hierarchy in Haplic Andosols was confirmed by different stabilizing mechanisms of micro- and macroaggregates, however, somewhat diminished by oxides (pyrophosphate-, oxalate-, and dithionite-extractable Fe, Al, and Mn) acting as binding agents for macroaggregates. In Histic Andosols, no aggregate hierarchy was observed. The higher macroaggregate stability in organic farming practice compared with conventional farming is of interest due to the importance of macroaggregates in protecting SOM and soils from erosion, which is a prerequisite for soil functions in grasslands that are envisaged for food production in the future. Text Iceland Subarctic DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Biological Sciences Ecology FOS Biological sciences Chemistry Earth and Environmental Sciences |
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Biological Sciences Ecology FOS Biological sciences Chemistry Earth and Environmental Sciences Lehtinen, Taru Lair, Georg J. Leeuwen, Jeroen P. Van Blum, Winfried E.H. Bloem, Jaap Steffens, Markus Gísladóttir, Guðrún Ragnarsdóttir, Kristín Vala Aggregation and organic matter in subarctic Andosols under different grassland management |
topic_facet |
Biological Sciences Ecology FOS Biological sciences Chemistry Earth and Environmental Sciences |
description |
Quantity and quality of soil organic matter (SOM) affect physical, chemical, and biological soil properties, and are pivotal to productive and healthy grasslands. Thus, we analyzed the distribution of soil aggregates and assessed quality, quantity, and distribution of SOM in two unimproved and improved (two organic and two conventional) grasslands in subarctic Iceland, in Haplic and Histic Andosols. We also evaluated principal physicochemical and biological soil properties, which influence soil aggregation and SOM dynamics. Macroaggregates (>250 µm) in topsoils were most prominent in unimproved (62–77%) and organically (58–69%) managed sites, whereas 20–250 µm aggregates were the most prominent in conventionally managed sites (51–53%). Macroaggregate stability in topsoils, measured as mean weight diameter, was approximately twice as high in organically managed (12–20 mm) compared with the conventionally managed (5–8 mm) sites, possibly due to higher organic inputs (e.g., manure, compost, and cattle urine). In unimproved grasslands and one organic site, macroaggregates contributed between 40% and 70% of soil organic carbon (SOC) and nitrogen to bulk soil, whereas in high SOM concentration sites free particulate organic matter contributed up to 70% of the SOC and nitrogen to bulk soil. Aggregate hierarchy in Haplic Andosols was confirmed by different stabilizing mechanisms of micro- and macroaggregates, however, somewhat diminished by oxides (pyrophosphate-, oxalate-, and dithionite-extractable Fe, Al, and Mn) acting as binding agents for macroaggregates. In Histic Andosols, no aggregate hierarchy was observed. The higher macroaggregate stability in organic farming practice compared with conventional farming is of interest due to the importance of macroaggregates in protecting SOM and soils from erosion, which is a prerequisite for soil functions in grasslands that are envisaged for food production in the future. |
format |
Text |
author |
Lehtinen, Taru Lair, Georg J. Leeuwen, Jeroen P. Van Blum, Winfried E.H. Bloem, Jaap Steffens, Markus Gísladóttir, Guðrún Ragnarsdóttir, Kristín Vala |
author_facet |
Lehtinen, Taru Lair, Georg J. Leeuwen, Jeroen P. Van Blum, Winfried E.H. Bloem, Jaap Steffens, Markus Gísladóttir, Guðrún Ragnarsdóttir, Kristín Vala |
author_sort |
Lehtinen, Taru |
title |
Aggregation and organic matter in subarctic Andosols under different grassland management |
title_short |
Aggregation and organic matter in subarctic Andosols under different grassland management |
title_full |
Aggregation and organic matter in subarctic Andosols under different grassland management |
title_fullStr |
Aggregation and organic matter in subarctic Andosols under different grassland management |
title_full_unstemmed |
Aggregation and organic matter in subarctic Andosols under different grassland management |
title_sort |
aggregation and organic matter in subarctic andosols under different grassland management |
publisher |
Taylor & Francis |
publishDate |
2015 |
url |
https://dx.doi.org/10.6084/m9.figshare.1297062.v1 https://tandf.figshare.com/articles/journal_contribution/Aggregation_and_organic_matter_in_subarctic_Andosols_under_different_grassland_management/1297062/1 |
genre |
Iceland Subarctic |
genre_facet |
Iceland Subarctic |
op_relation |
https://dx.doi.org/10.1080/09064710.2014.1001778 https://dx.doi.org/10.6084/m9.figshare.1297062 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.1297062.v1 https://doi.org/10.1080/09064710.2014.1001778 https://doi.org/10.6084/m9.figshare.1297062 |
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