Lake-landscape connections at the forest-tundra transition of northern Manitoba
To better understand aquatic-terrestrial linkages in the sub-Arctic, and specifically the relative importance of landscape position versus land cover, we surveyed lakes, soils, land cover, and lake/basin characteristics in a 14000 km region of acidic forest-tundra landscape near northern Manitoba, C...
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ftbowdoincollege:oai:digitalcommons.bowdoin.edu:eos-faculty-publications-1048 2023-05-15T14:50:06+02:00 Lake-landscape connections at the forest-tundra transition of northern Manitoba Umbanhowar, Charles E. Camill, Philip Edlund, Mark B. Geiss, Christoph Henneghan, Patrick Passow, Kendra 2015-01-01T08:00:00Z https://digitalcommons.bowdoin.edu/eos-faculty-publications/49 unknown Bowdoin Digital Commons https://digitalcommons.bowdoin.edu/eos-faculty-publications/49 Earth and Oceanographic Science Faculty Work Arctic Biogeochemistry DOC Lake order Lakes Land cover Landscape sub-Arctic Tundra text 2015 ftbowdoincollege 2023-02-24T06:38:33Z To better understand aquatic-terrestrial linkages in the sub-Arctic, and specifically the relative importance of landscape position versus land cover, we surveyed lakes, soils, land cover, and lake/basin characteristics in a 14000 km region of acidic forest-tundra landscape near northern Manitoba, Canada (59.56°N, 97.72°W) in 2009. We analyzed 39 different biological, chemical, and physical variables for lakes and soils. We used a remote-sensing-based classification to determine that the landscape was 21% water, 46% peat-forming lowland, and 24.9% open tundra, and we assigned lake order to all lakes based on the order of the outlet stream for each lake. Lakes were oligotrophic to mesotrophic (median total phosphorus: TP = 11.8 μg L ), N-limited (median dissolved inorganic nitrogen: TP = 1.6), acidic (median pH 5.7), and had moderate amounts of dissolved organic carbon (median DOC = 5.2 mg L ). We identified 2 principle groups of variables represented by DOC and conductivity/ cations, respectively, that captured major axes of lake variation. DOC, 2 measures of DOC quality (a /a [a proxy for molecular weight and aromaticity] and specific ultraviolet absorbance), and Fe and were significantly correlated with percent cover of lowland forest, but conductivity/cations were not correlated with variation in land cover. Soils were generally acidic (pH 2.7-4.4) and nutrient-poor, and wetland soils contained more carbon and higher concentrations of calcium, magnesium, and other cations than upland open tundra. Landscape position of lakes (measured as lake order) did not capture systematic differences in land cover or lake biogeochemistry. Our results highlight the importance of lowland export of DOC to lakes and further suggest the need for additional regional studies of aquatic-terrestrial connections in Arctic and sub-Arctic landscapes. 2 -1 -1 250 365 Text Arctic Tundra Bowdoin College: Bowdoin Digital Commons Arctic Canada |
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Open Polar |
collection |
Bowdoin College: Bowdoin Digital Commons |
op_collection_id |
ftbowdoincollege |
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unknown |
topic |
Arctic Biogeochemistry DOC Lake order Lakes Land cover Landscape sub-Arctic Tundra |
spellingShingle |
Arctic Biogeochemistry DOC Lake order Lakes Land cover Landscape sub-Arctic Tundra Umbanhowar, Charles E. Camill, Philip Edlund, Mark B. Geiss, Christoph Henneghan, Patrick Passow, Kendra Lake-landscape connections at the forest-tundra transition of northern Manitoba |
topic_facet |
Arctic Biogeochemistry DOC Lake order Lakes Land cover Landscape sub-Arctic Tundra |
description |
To better understand aquatic-terrestrial linkages in the sub-Arctic, and specifically the relative importance of landscape position versus land cover, we surveyed lakes, soils, land cover, and lake/basin characteristics in a 14000 km region of acidic forest-tundra landscape near northern Manitoba, Canada (59.56°N, 97.72°W) in 2009. We analyzed 39 different biological, chemical, and physical variables for lakes and soils. We used a remote-sensing-based classification to determine that the landscape was 21% water, 46% peat-forming lowland, and 24.9% open tundra, and we assigned lake order to all lakes based on the order of the outlet stream for each lake. Lakes were oligotrophic to mesotrophic (median total phosphorus: TP = 11.8 μg L ), N-limited (median dissolved inorganic nitrogen: TP = 1.6), acidic (median pH 5.7), and had moderate amounts of dissolved organic carbon (median DOC = 5.2 mg L ). We identified 2 principle groups of variables represented by DOC and conductivity/ cations, respectively, that captured major axes of lake variation. DOC, 2 measures of DOC quality (a /a [a proxy for molecular weight and aromaticity] and specific ultraviolet absorbance), and Fe and were significantly correlated with percent cover of lowland forest, but conductivity/cations were not correlated with variation in land cover. Soils were generally acidic (pH 2.7-4.4) and nutrient-poor, and wetland soils contained more carbon and higher concentrations of calcium, magnesium, and other cations than upland open tundra. Landscape position of lakes (measured as lake order) did not capture systematic differences in land cover or lake biogeochemistry. Our results highlight the importance of lowland export of DOC to lakes and further suggest the need for additional regional studies of aquatic-terrestrial connections in Arctic and sub-Arctic landscapes. 2 -1 -1 250 365 |
format |
Text |
author |
Umbanhowar, Charles E. Camill, Philip Edlund, Mark B. Geiss, Christoph Henneghan, Patrick Passow, Kendra |
author_facet |
Umbanhowar, Charles E. Camill, Philip Edlund, Mark B. Geiss, Christoph Henneghan, Patrick Passow, Kendra |
author_sort |
Umbanhowar, Charles E. |
title |
Lake-landscape connections at the forest-tundra transition of northern Manitoba |
title_short |
Lake-landscape connections at the forest-tundra transition of northern Manitoba |
title_full |
Lake-landscape connections at the forest-tundra transition of northern Manitoba |
title_fullStr |
Lake-landscape connections at the forest-tundra transition of northern Manitoba |
title_full_unstemmed |
Lake-landscape connections at the forest-tundra transition of northern Manitoba |
title_sort |
lake-landscape connections at the forest-tundra transition of northern manitoba |
publisher |
Bowdoin Digital Commons |
publishDate |
2015 |
url |
https://digitalcommons.bowdoin.edu/eos-faculty-publications/49 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_source |
Earth and Oceanographic Science Faculty Work |
op_relation |
https://digitalcommons.bowdoin.edu/eos-faculty-publications/49 |
_version_ |
1766321177671761920 |