Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica
Previous studies have established links between biodiversity and soil geochemistry in the McMurdo Dry Valleys, Antarctica, where environmental gradients are important determinants of soil biodiversity. However, these gradients are not well established in the Central Transantarctic Mountains, which a...
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ftcopernicus:oai:publications.copernicus.org:bgd88839 2023-05-15T13:31:39+02:00 Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica Diaz, Melisa A. Gardner, Christopher B. Welch, Susan A. Jackson, W. Andrew Adams, Byron J. Wall, Diana H. Hogg, Ian D. Fierer, Noah Lyons, W. Berry 2020-09-17 application/pdf https://doi.org/10.5194/bg-2020-316 https://bg.copernicus.org/preprints/bg-2020-316/ eng eng doi:10.5194/bg-2020-316 https://bg.copernicus.org/preprints/bg-2020-316/ eISSN: 1726-4189 Text 2020 ftcopernicus https://doi.org/10.5194/bg-2020-316 2020-09-21T16:22:13Z Previous studies have established links between biodiversity and soil geochemistry in the McMurdo Dry Valleys, Antarctica, where environmental gradients are important determinants of soil biodiversity. However, these gradients are not well established in the Central Transantarctic Mountains, which are thought to represent some of the least hospitable Antarctic soils. We analyzed 220 samples from 11 ice-free areas along the Shackleton Glacier (~ 85 °S), a major outlet glacier of the East Antarctic Ice Sheet. We established three zones of distinct geochemical gradients near the head of the glacier (upper), central (middle), and at the mouth (lower). The upper zone had the highest water-soluble salt concentrations with total salt concentrations exceeding 80,000 µg g -1 , while the lower zone had the lowest water-soluble N : P ratios, suggesting that, in addition to other parameters (such as proximity to water/ice), the lower zone likely represents the most favorable ecological habitats. Given the strong dependence of geochemistry with geographic parameters, we established multiple linear regression and random forest models to predict soil geochemical trends given latitude, longitude, elevation, distance from the coast, distance from the glacier, and soil moisture (variables which can be inferred from remote measurements). Confidence in our model predictions was moderately high, with R 2 values for total water-soluble salts, water-soluble N : P, ClO 4 - , and ClO 3 - of 0.51, 0.42, 0.40, and 0.28, respectively. These modeling results can be used to predict geochemical gradients and estimate salt concentrations for other Transantarctic Mountain soils, information that can ultimately be used to better predict distributions of soil biota in this remote region. Text Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Shackleton Glacier Copernicus Publications: E-Journals Antarctic East Antarctic Ice Sheet McMurdo Dry Valleys Shackleton Shackleton Glacier ENVELOPE(-37.200,-37.200,-54.133,-54.133) Transantarctic Mountains |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Previous studies have established links between biodiversity and soil geochemistry in the McMurdo Dry Valleys, Antarctica, where environmental gradients are important determinants of soil biodiversity. However, these gradients are not well established in the Central Transantarctic Mountains, which are thought to represent some of the least hospitable Antarctic soils. We analyzed 220 samples from 11 ice-free areas along the Shackleton Glacier (~ 85 °S), a major outlet glacier of the East Antarctic Ice Sheet. We established three zones of distinct geochemical gradients near the head of the glacier (upper), central (middle), and at the mouth (lower). The upper zone had the highest water-soluble salt concentrations with total salt concentrations exceeding 80,000 µg g -1 , while the lower zone had the lowest water-soluble N : P ratios, suggesting that, in addition to other parameters (such as proximity to water/ice), the lower zone likely represents the most favorable ecological habitats. Given the strong dependence of geochemistry with geographic parameters, we established multiple linear regression and random forest models to predict soil geochemical trends given latitude, longitude, elevation, distance from the coast, distance from the glacier, and soil moisture (variables which can be inferred from remote measurements). Confidence in our model predictions was moderately high, with R 2 values for total water-soluble salts, water-soluble N : P, ClO 4 - , and ClO 3 - of 0.51, 0.42, 0.40, and 0.28, respectively. These modeling results can be used to predict geochemical gradients and estimate salt concentrations for other Transantarctic Mountain soils, information that can ultimately be used to better predict distributions of soil biota in this remote region. |
format |
Text |
author |
Diaz, Melisa A. Gardner, Christopher B. Welch, Susan A. Jackson, W. Andrew Adams, Byron J. Wall, Diana H. Hogg, Ian D. Fierer, Noah Lyons, W. Berry |
spellingShingle |
Diaz, Melisa A. Gardner, Christopher B. Welch, Susan A. Jackson, W. Andrew Adams, Byron J. Wall, Diana H. Hogg, Ian D. Fierer, Noah Lyons, W. Berry Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
author_facet |
Diaz, Melisa A. Gardner, Christopher B. Welch, Susan A. Jackson, W. Andrew Adams, Byron J. Wall, Diana H. Hogg, Ian D. Fierer, Noah Lyons, W. Berry |
author_sort |
Diaz, Melisa A. |
title |
Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
title_short |
Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
title_full |
Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
title_fullStr |
Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
title_full_unstemmed |
Geochemical zones and environmental gradients for soils from the Central Transantarctic Mountains, Antarctica |
title_sort |
geochemical zones and environmental gradients for soils from the central transantarctic mountains, antarctica |
publishDate |
2020 |
url |
https://doi.org/10.5194/bg-2020-316 https://bg.copernicus.org/preprints/bg-2020-316/ |
long_lat |
ENVELOPE(-37.200,-37.200,-54.133,-54.133) |
geographic |
Antarctic East Antarctic Ice Sheet McMurdo Dry Valleys Shackleton Shackleton Glacier Transantarctic Mountains |
geographic_facet |
Antarctic East Antarctic Ice Sheet McMurdo Dry Valleys Shackleton Shackleton Glacier Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Shackleton Glacier |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet McMurdo Dry Valleys Shackleton Glacier |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2020-316 https://bg.copernicus.org/preprints/bg-2020-316/ |
op_doi |
https://doi.org/10.5194/bg-2020-316 |
_version_ |
1766019702471000064 |