Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest
The natural carbon dioxide (CO2) emission from the ecosystem, also termed as the ecosystem respiration (Reco), is the primary natural source of atmospheric CO2. The contemporary models rely on empirical functions to represent decomposition of litter with multiple soil carbon pools decaying at differ...
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ftdoajarticles:oai:doaj.org/article:dd9abbc6afaa425fb8581ed8c3ea9614 2023-05-15T15:26:06+02:00 Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest Soumendra N. Bhanja Junye Wang Roland Bol 2022-06-01T00:00:00Z https://doi.org/10.3389/fenvs.2022.898199 https://doaj.org/article/dd9abbc6afaa425fb8581ed8c3ea9614 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fenvs.2022.898199/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2022.898199 https://doaj.org/article/dd9abbc6afaa425fb8581ed8c3ea9614 Frontiers in Environmental Science, Vol 10 (2022) ecosystem respiration soil respiration root respiration litter decomposition respiration modeling SWAT (soil and water assessment tool) Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.3389/fenvs.2022.898199 2022-12-30T23:13:53Z The natural carbon dioxide (CO2) emission from the ecosystem, also termed as the ecosystem respiration (Reco), is the primary natural source of atmospheric CO2. The contemporary models rely on empirical functions to represent decomposition of litter with multiple soil carbon pools decaying at different rates in estimating Reco variations and its partitioning into autotrophic (Ra) (originating from plants) and heterotrophic (originating mostly from microorganisms) respiration (Rh) in relation to variation in temperature and soil water content. Microbially-mediated litter decomposition scheme representation are not very popular yet. However, microbial enzymatic processes play integral role in litter as well as soil organic matter (SOM) decomposition. Here we developed a mechanistic model comprising of multiple hydro-biogeochemical modules in the soil and water assessment tool (SWAT) code to explicitly incorporate microbial-enzymatic litter decomposition and decomposition of SOM for separately estimating regional-scale Ra, Rh and Reco. Modeled annual mean Reco values are found varying from 1,600 to 8,200 kg C ha−1 yr−1 in 2000–2013 within the boreal forest covered sub-basins of the Athabasca River Basin (ARB), Canada. While, for the 2000–2013 period, the annual mean Ra, Rh and soil CO2 emission (Rs) are varying within 800–6,000 kg C ha−1 yr−1, 700–4,200 kg C ha−1 yr−1 and 1,200–5,000 kg C ha−1 yr−1, respectively. Rs generally dominates Reco with nearly 60–90% contribution in most of the sub-basins in ARB. The model estimates corroborate well with the site-scale and satellite-based estimates reported at similar land use and climatic regions. Mechanistic modeling of Reco and its components are critical to understanding future climate change feedbacks and to help reduce uncertainties particularly in the boreal and subarctic regions that has huge soil carbon store. Article in Journal/Newspaper Athabasca River Subarctic Directory of Open Access Journals: DOAJ Articles Athabasca River Canada Frontiers in Environmental Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ecosystem respiration soil respiration root respiration litter decomposition respiration modeling SWAT (soil and water assessment tool) Environmental sciences GE1-350 |
spellingShingle |
ecosystem respiration soil respiration root respiration litter decomposition respiration modeling SWAT (soil and water assessment tool) Environmental sciences GE1-350 Soumendra N. Bhanja Junye Wang Roland Bol Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
topic_facet |
ecosystem respiration soil respiration root respiration litter decomposition respiration modeling SWAT (soil and water assessment tool) Environmental sciences GE1-350 |
description |
The natural carbon dioxide (CO2) emission from the ecosystem, also termed as the ecosystem respiration (Reco), is the primary natural source of atmospheric CO2. The contemporary models rely on empirical functions to represent decomposition of litter with multiple soil carbon pools decaying at different rates in estimating Reco variations and its partitioning into autotrophic (Ra) (originating from plants) and heterotrophic (originating mostly from microorganisms) respiration (Rh) in relation to variation in temperature and soil water content. Microbially-mediated litter decomposition scheme representation are not very popular yet. However, microbial enzymatic processes play integral role in litter as well as soil organic matter (SOM) decomposition. Here we developed a mechanistic model comprising of multiple hydro-biogeochemical modules in the soil and water assessment tool (SWAT) code to explicitly incorporate microbial-enzymatic litter decomposition and decomposition of SOM for separately estimating regional-scale Ra, Rh and Reco. Modeled annual mean Reco values are found varying from 1,600 to 8,200 kg C ha−1 yr−1 in 2000–2013 within the boreal forest covered sub-basins of the Athabasca River Basin (ARB), Canada. While, for the 2000–2013 period, the annual mean Ra, Rh and soil CO2 emission (Rs) are varying within 800–6,000 kg C ha−1 yr−1, 700–4,200 kg C ha−1 yr−1 and 1,200–5,000 kg C ha−1 yr−1, respectively. Rs generally dominates Reco with nearly 60–90% contribution in most of the sub-basins in ARB. The model estimates corroborate well with the site-scale and satellite-based estimates reported at similar land use and climatic regions. Mechanistic modeling of Reco and its components are critical to understanding future climate change feedbacks and to help reduce uncertainties particularly in the boreal and subarctic regions that has huge soil carbon store. |
format |
Article in Journal/Newspaper |
author |
Soumendra N. Bhanja Junye Wang Roland Bol |
author_facet |
Soumendra N. Bhanja Junye Wang Roland Bol |
author_sort |
Soumendra N. Bhanja |
title |
Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
title_short |
Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
title_full |
Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
title_fullStr |
Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
title_full_unstemmed |
Soil CO2 Emission Largely Dominates the Total Ecosystem CO2 Emission at Canadian Boreal Forest |
title_sort |
soil co2 emission largely dominates the total ecosystem co2 emission at canadian boreal forest |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fenvs.2022.898199 https://doaj.org/article/dd9abbc6afaa425fb8581ed8c3ea9614 |
geographic |
Athabasca River Canada |
geographic_facet |
Athabasca River Canada |
genre |
Athabasca River Subarctic |
genre_facet |
Athabasca River Subarctic |
op_source |
Frontiers in Environmental Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fenvs.2022.898199/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2022.898199 https://doaj.org/article/dd9abbc6afaa425fb8581ed8c3ea9614 |
op_doi |
https://doi.org/10.3389/fenvs.2022.898199 |
container_title |
Frontiers in Environmental Science |
container_volume |
10 |
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1766356652893667328 |