Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay
Loess—dominated ecosystems cover ≈14%(11 000 km 2 ) of the Arctic Coastal Plain and much of the northern portion of the Arctic Foothills. Knowledge of this poorly known ecosystem is important for sound land—use planning of the expanding developments in the region and for understanding the paleoecolo...
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crwiley:10.2307/2937050 2024-09-30T14:30:26+00:00 Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay Walker, D. A. Everett, K. R. 1991 http://dx.doi.org/10.2307/2937050 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2937050 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2937050 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/2937050 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecological Monographs volume 61, issue 4, page 437-464 ISSN 0012-9615 1557-7015 journal-article 1991 crwiley https://doi.org/10.2307/2937050 2024-09-11T04:12:40Z Loess—dominated ecosystems cover ≈14%(11 000 km 2 ) of the Arctic Coastal Plain and much of the northern portion of the Arctic Foothills. Knowledge of this poorly known ecosystem is important for sound land—use planning of the expanding developments in the region and for understanding the paleoecological dynamics of eolian systems that once dominated much of northern Alaska. A conceptual alkaline—tundra toposequence includes eight common vegetation types and associated soils that occur near the arctic coast. A model of the regional loess gradient describes soils and vegetation downwind of the Sagavanirktok River. The addition of calcareous loess affects numerous soil properties, including bulk density, pH, water retention properties, concentrations of soil nutrients, and seasonal thaw depths. Many plant taxa, particularly cryptogams, increase in abundance downwind of the river, apparently in response to higher amounts of nutrients and moisture associated with finer soil—particle sizes and greater organic content. For example, the highest extractable P values (8—12 µg/g) occur in areas with circumneutral pH and finer grained soils, and low P values (<2 µg/g) occur in acidic soils north of the loess region. Early, minerotrophic stages of tundra succession are maintained by loess blown from the Sagavanirktok, Canning, and other large braided—river floodplains. Areas downwind of these rivers provide analogues for vegetation that existed in unstable areas of the Alaskan Coastal Plain during and following full glacial conditions. Total aboveground phytomass in wet acidic sites at Prudhoe Bay (163 ± 21 g/m 2 ) is close to values from similar sites at Barrow and Devon Island. Only a small amount of data is available for alkaline areas, but there is indication of lower biomass near the major rivers, suggesting a response to lower nutrient regimes. Properties of loess tundra important for land—use planning include: (1) its high ice content, which contributes to its susceptibility to thermokarst; (2) high salinities, ... Article in Journal/Newspaper Arctic Barrow Devon Island Prudhoe Bay Thermokarst Tundra Alaska Wiley Online Library Arctic Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Ecological Monographs 61 4 437 464 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Loess—dominated ecosystems cover ≈14%(11 000 km 2 ) of the Arctic Coastal Plain and much of the northern portion of the Arctic Foothills. Knowledge of this poorly known ecosystem is important for sound land—use planning of the expanding developments in the region and for understanding the paleoecological dynamics of eolian systems that once dominated much of northern Alaska. A conceptual alkaline—tundra toposequence includes eight common vegetation types and associated soils that occur near the arctic coast. A model of the regional loess gradient describes soils and vegetation downwind of the Sagavanirktok River. The addition of calcareous loess affects numerous soil properties, including bulk density, pH, water retention properties, concentrations of soil nutrients, and seasonal thaw depths. Many plant taxa, particularly cryptogams, increase in abundance downwind of the river, apparently in response to higher amounts of nutrients and moisture associated with finer soil—particle sizes and greater organic content. For example, the highest extractable P values (8—12 µg/g) occur in areas with circumneutral pH and finer grained soils, and low P values (<2 µg/g) occur in acidic soils north of the loess region. Early, minerotrophic stages of tundra succession are maintained by loess blown from the Sagavanirktok, Canning, and other large braided—river floodplains. Areas downwind of these rivers provide analogues for vegetation that existed in unstable areas of the Alaskan Coastal Plain during and following full glacial conditions. Total aboveground phytomass in wet acidic sites at Prudhoe Bay (163 ± 21 g/m 2 ) is close to values from similar sites at Barrow and Devon Island. Only a small amount of data is available for alkaline areas, but there is indication of lower biomass near the major rivers, suggesting a response to lower nutrient regimes. Properties of loess tundra important for land—use planning include: (1) its high ice content, which contributes to its susceptibility to thermokarst; (2) high salinities, ... |
format |
Article in Journal/Newspaper |
author |
Walker, D. A. Everett, K. R. |
spellingShingle |
Walker, D. A. Everett, K. R. Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
author_facet |
Walker, D. A. Everett, K. R. |
author_sort |
Walker, D. A. |
title |
Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
title_short |
Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
title_full |
Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
title_fullStr |
Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
title_full_unstemmed |
Loess Ecosystems of Northern Alaska: Regional Gradient and Toposequence at Prudhoe Bay |
title_sort |
loess ecosystems of northern alaska: regional gradient and toposequence at prudhoe bay |
publisher |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.2307/2937050 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F2937050 https://onlinelibrary.wiley.com/doi/pdf/10.2307/2937050 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/2937050 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) |
geographic |
Arctic Devon Island |
geographic_facet |
Arctic Devon Island |
genre |
Arctic Barrow Devon Island Prudhoe Bay Thermokarst Tundra Alaska |
genre_facet |
Arctic Barrow Devon Island Prudhoe Bay Thermokarst Tundra Alaska |
op_source |
Ecological Monographs volume 61, issue 4, page 437-464 ISSN 0012-9615 1557-7015 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/2937050 |
container_title |
Ecological Monographs |
container_volume |
61 |
container_issue |
4 |
container_start_page |
437 |
op_container_end_page |
464 |
_version_ |
1811635385690750976 |