Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD)
Table 1. Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD). The n -factor values are the least square means ±SE fro...
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ftdatacite:10.6084/m9.figshare.1011720 2023-05-15T17:56:33+02:00 Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) Nossov, Dana R M Torre Jorgenson Kielland, Knut Kanevskiy, Mikhail Z 2013 https://dx.doi.org/10.6084/m9.figshare.1011720 https://iop.figshare.com/articles/dataset/___Characteristics_of_each_landscape_type_including_region_mean_elevation_mean_annual_air_temperatur/1011720 unknown IOP Publishing Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Environmental Science dataset Dataset 2013 ftdatacite https://doi.org/10.6084/m9.figshare.1011720 2021-11-05T12:55:41Z Table 1. Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD). The n -factor values are the least square means ±SE from a Tukey HSD post hoc test conducted after a significant effect of landscape type was found with a two-way ANOVA ( p = 0.01); significant differences between means are denoted by different letters. Abstract Discontinuous permafrost in the North American boreal forest is strongly influenced by the effects of ecological succession on the accumulation of surface organic matter, making permafrost vulnerable to degradation resulting from fire disturbance. To assess factors affecting permafrost degradation after wildfire, we compared vegetation composition and soil properties between recently burned and unburned sites across three soil landscapes (rocky uplands, silty uplands, and sandy lowlands) situated within the Yukon Flats and Yukon-Tanana Uplands in interior Alaska. Mean annual air temperatures at our study sites from 2011 to 2012 were relatively cold (−5.5 ° C) and favorable to permafrost formation. Burning of mature evergreen forests with thick moss covers caused replacement by colonizing species in severely burned areas and recovery of pre-fire understory vegetation in moderately burned areas. Surface organic layer thickness strongly affected thermal regimes and thaw depths. On average, fire caused a five-fold decrease in mean surface organic layer thickness, a doubling of water storage in the active layer, a doubling of thaw depth, an increase in soil temperature at the surface (−0.6 to +2.1 ° C) and at 1 m depth (−1.7 to +0.4 ° C), and a two-fold increase in net soil heat input. Degradation of the upper permafrost occurred at all burned sites, but differences in soil texture and moisture among soil landscapes allowed permafrost to persist beneath the active layer in the silty uplands, whereas a talik of unknown depth developed in the rocky uplands and a thin talik developed in the sandy lowlands. A changing climate and fire regime would undoubtedly influence permafrost in the boreal forest, but the patterns of degradation or stabilization would vary considerably across the discontinuous permafrost zone due to differences in microclimate, successional patterns, and soil characteristics. Dataset permafrost Talik Alaska Yukon DataCite Metadata Store (German National Library of Science and Technology) Talik ENVELOPE(146.601,146.601,59.667,59.667) Yukon |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Environmental Science |
spellingShingle |
Environmental Science Nossov, Dana R M Torre Jorgenson Kielland, Knut Kanevskiy, Mikhail Z Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
topic_facet |
Environmental Science |
description |
Table 1. Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD). The n -factor values are the least square means ±SE from a Tukey HSD post hoc test conducted after a significant effect of landscape type was found with a two-way ANOVA ( p = 0.01); significant differences between means are denoted by different letters. Abstract Discontinuous permafrost in the North American boreal forest is strongly influenced by the effects of ecological succession on the accumulation of surface organic matter, making permafrost vulnerable to degradation resulting from fire disturbance. To assess factors affecting permafrost degradation after wildfire, we compared vegetation composition and soil properties between recently burned and unburned sites across three soil landscapes (rocky uplands, silty uplands, and sandy lowlands) situated within the Yukon Flats and Yukon-Tanana Uplands in interior Alaska. Mean annual air temperatures at our study sites from 2011 to 2012 were relatively cold (−5.5 ° C) and favorable to permafrost formation. Burning of mature evergreen forests with thick moss covers caused replacement by colonizing species in severely burned areas and recovery of pre-fire understory vegetation in moderately burned areas. Surface organic layer thickness strongly affected thermal regimes and thaw depths. On average, fire caused a five-fold decrease in mean surface organic layer thickness, a doubling of water storage in the active layer, a doubling of thaw depth, an increase in soil temperature at the surface (−0.6 to +2.1 ° C) and at 1 m depth (−1.7 to +0.4 ° C), and a two-fold increase in net soil heat input. Degradation of the upper permafrost occurred at all burned sites, but differences in soil texture and moisture among soil landscapes allowed permafrost to persist beneath the active layer in the silty uplands, whereas a talik of unknown depth developed in the rocky uplands and a thin talik developed in the sandy lowlands. A changing climate and fire regime would undoubtedly influence permafrost in the boreal forest, but the patterns of degradation or stabilization would vary considerably across the discontinuous permafrost zone due to differences in microclimate, successional patterns, and soil characteristics. |
format |
Dataset |
author |
Nossov, Dana R M Torre Jorgenson Kielland, Knut Kanevskiy, Mikhail Z |
author_facet |
Nossov, Dana R M Torre Jorgenson Kielland, Knut Kanevskiy, Mikhail Z |
author_sort |
Nossov, Dana R |
title |
Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
title_short |
Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
title_full |
Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
title_fullStr |
Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
title_full_unstemmed |
Characteristics of each landscape type, including region, mean elevation, mean annual air temperature (MAAT), air freezing degree days (FDD), air thawing degree days (TDD), and freezing n -factor (ratio of soil surface FDD to air FDD) |
title_sort |
characteristics of each landscape type, including region, mean elevation, mean annual air temperature (maat), air freezing degree days (fdd), air thawing degree days (tdd), and freezing n -factor (ratio of soil surface fdd to air fdd) |
publisher |
IOP Publishing |
publishDate |
2013 |
url |
https://dx.doi.org/10.6084/m9.figshare.1011720 https://iop.figshare.com/articles/dataset/___Characteristics_of_each_landscape_type_including_region_mean_elevation_mean_annual_air_temperatur/1011720 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Talik Yukon |
geographic_facet |
Talik Yukon |
genre |
permafrost Talik Alaska Yukon |
genre_facet |
permafrost Talik Alaska Yukon |
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.1011720 |
_version_ |
1766164744759148544 |