Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape
Shrub expansion in tundra ecosystems may act as a positive feedback to climate warming, the strength of which depends on its spatial extent. Recent studies have shown that shrub expansion is more likely to occur in areas with high soil moisture and nutrient availability, conditions typically found i...
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ftdoajarticles:oai:doaj.org/article:c798adfc7d4d43418bacd4a4e16c74f1 2023-09-05T13:17:48+02:00 Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape Salvatore R Curasi Michael M Loranty Susan M Natali 2016-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/11/4/045002 https://doaj.org/article/c798adfc7d4d43418bacd4a4e16c74f1 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/11/4/045002 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/4/045002 1748-9326 https://doaj.org/article/c798adfc7d4d43418bacd4a4e16c74f1 Environmental Research Letters, Vol 11, Iss 4, p 045002 (2016) arctic tundra climate change water track shrub remote sensing Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2016 ftdoajarticles https://doi.org/10.1088/1748-9326/11/4/045002 2023-08-13T00:37:50Z Shrub expansion in tundra ecosystems may act as a positive feedback to climate warming, the strength of which depends on its spatial extent. Recent studies have shown that shrub expansion is more likely to occur in areas with high soil moisture and nutrient availability, conditions typically found in sub-surface water channels known as water tracks. Water tracks are 5–15 m wide channels of subsurface water drainage in permafrost landscapes and are characterized by deeper seasonal thaw depth, warmer soil temperatures, and higher soil moisture and nutrient content relative to adjacent tundra. Consequently, enhanced vegetation productivity, and dominance by tall deciduous shrubs, are typical in water tracks. Quantifying the distribution of water tracks may inform investigations of the extent of shrub expansion and associated impacts on tundra ecosystem carbon cycling. Here, we quantify the distribution of water tracks and their contribution to growing season CO _2 dynamics for a Siberian tundra landscape using satellite observations, meteorological data, and field measurements. We find that water tracks occupy 7.4% of the 448 km ^2 study area, and account for a slightly larger proportion of growing season carbon uptake relative to surrounding tundra. For areas inside water tracks dominated by shrubs, field observations revealed higher shrub biomass and higher ecosystem respiration and gross primary productivity relative to adjacent upland tundra. Conversely, a comparison of graminoid-dominated areas in water tracks and inter-track tundra revealed that water track locations dominated by graminoids had lower shrub biomass yet increased net uptake of CO _2 . Our results show water tracks are an important component of this landscape. Their distribution will influence ecosystem structural and functional responses to climate, and is therefore of importance for modeling. Article in Journal/Newspaper Arctic Climate change permafrost Tundra Directory of Open Access Journals: DOAJ Articles Arctic Environmental Research Letters 11 4 045002 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
arctic tundra climate change water track shrub remote sensing Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
arctic tundra climate change water track shrub remote sensing Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Salvatore R Curasi Michael M Loranty Susan M Natali Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
topic_facet |
arctic tundra climate change water track shrub remote sensing Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
Shrub expansion in tundra ecosystems may act as a positive feedback to climate warming, the strength of which depends on its spatial extent. Recent studies have shown that shrub expansion is more likely to occur in areas with high soil moisture and nutrient availability, conditions typically found in sub-surface water channels known as water tracks. Water tracks are 5–15 m wide channels of subsurface water drainage in permafrost landscapes and are characterized by deeper seasonal thaw depth, warmer soil temperatures, and higher soil moisture and nutrient content relative to adjacent tundra. Consequently, enhanced vegetation productivity, and dominance by tall deciduous shrubs, are typical in water tracks. Quantifying the distribution of water tracks may inform investigations of the extent of shrub expansion and associated impacts on tundra ecosystem carbon cycling. Here, we quantify the distribution of water tracks and their contribution to growing season CO _2 dynamics for a Siberian tundra landscape using satellite observations, meteorological data, and field measurements. We find that water tracks occupy 7.4% of the 448 km ^2 study area, and account for a slightly larger proportion of growing season carbon uptake relative to surrounding tundra. For areas inside water tracks dominated by shrubs, field observations revealed higher shrub biomass and higher ecosystem respiration and gross primary productivity relative to adjacent upland tundra. Conversely, a comparison of graminoid-dominated areas in water tracks and inter-track tundra revealed that water track locations dominated by graminoids had lower shrub biomass yet increased net uptake of CO _2 . Our results show water tracks are an important component of this landscape. Their distribution will influence ecosystem structural and functional responses to climate, and is therefore of importance for modeling. |
format |
Article in Journal/Newspaper |
author |
Salvatore R Curasi Michael M Loranty Susan M Natali |
author_facet |
Salvatore R Curasi Michael M Loranty Susan M Natali |
author_sort |
Salvatore R Curasi |
title |
Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
title_short |
Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
title_full |
Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
title_fullStr |
Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
title_full_unstemmed |
Water track distribution and effects on carbon dioxide flux in an eastern Siberian upland tundra landscape |
title_sort |
water track distribution and effects on carbon dioxide flux in an eastern siberian upland tundra landscape |
publisher |
IOP Publishing |
publishDate |
2016 |
url |
https://doi.org/10.1088/1748-9326/11/4/045002 https://doaj.org/article/c798adfc7d4d43418bacd4a4e16c74f1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Tundra |
genre_facet |
Arctic Climate change permafrost Tundra |
op_source |
Environmental Research Letters, Vol 11, Iss 4, p 045002 (2016) |
op_relation |
https://doi.org/10.1088/1748-9326/11/4/045002 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/4/045002 1748-9326 https://doaj.org/article/c798adfc7d4d43418bacd4a4e16c74f1 |
op_doi |
https://doi.org/10.1088/1748-9326/11/4/045002 |
container_title |
Environmental Research Letters |
container_volume |
11 |
container_issue |
4 |
container_start_page |
045002 |
_version_ |
1776198835216842752 |