Influence of environmental factors on autotrophic, soil and ecosystem respirations in Canadian boreal forest

Soumendra N. Bhanja; Junye Wang

doi:10.1016/j.ecolind.2021.107517

Influence of environmental factors on autotrophic, soil and ecosystem respirations in Canadian boreal forest

Soumendra N. Bhanja, Junye Wang

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Ecosystem respiration (R_eco) and its components, the autotrophic respiration (R_a) and soil respiration (R_s) are the essential indicators of the global carbon cycle. They are represented as functions of either temperature or soil moisture, or a combination of both in the widely-used Earth System Models (ESMs). Thus, it is difficult to evaluate the influence of other environmental factors (such as, precipitation, soil temperature, dissolved oxygen level and oxidation reduction potential (ORP)) on R_a, R_s and R_eco. Here we introduced microbially mediated, detailed carbon cycle processes within our mechanistic model to address this issue. Dominance analysis using a multivariate approach was performed to find out the influence of individual environmental factors on R_a, R_s and R_eco in the cold climate regions of Athabasca River Basin (ARB), Canada. Contribution of the 6 predictor variables, including air temperature, precipitation, soil temperature, water-filled pore space (WFPS) used as a proxy of soil moisture, dissolved oxygen level, and ORP, on R_a, R_s and R_eco were estimated based on the R² values originated from multiple regression analyses. Our results showed that the prevailing temperature (both air and soil) and dissolved oxygen levels are the major influencing factors on R_a, R_s and R_eco. WFPS is found to be the least influential factor on respiration estimation. Output of this study can be used to consider the crucial roles of environmental drivers in R_a, R_s and R_eco estimation in the development of future ESMs.

Original language	English
Article number	107517
Journal	Ecological Indicators
Volume	125
DOIs	https://doi.org/10.1016/j.ecolind.2021.107517
State	Published - Jun 2021
Externally published	Yes

Funding

S.N.B. acknowledges support from the Indian Institute of Science in the form of C. V. Raman Postdoctoral Fellowship for carrying out the study. J.W. would like to thank the Alberta Economic Development and Trade for the Campus Alberta Innovates Program Research Chair (No. RCP-12-001-BCAIP) for their support. The authors acknowledge FLUXNET and SRDB network for making their data available to public.

Funders	Funder number
Indian Institute of Science

Keywords

Autotrophic respiration
Canadian boreal forest
Carbon cycle
Cold climate region
Dissolved oxygen
Ecosystem respiration
Root respiration
SWAT
Soil respiration

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10.1016/j.ecolind.2021.107517

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title = "Influence of environmental factors on autotrophic, soil and ecosystem respirations in Canadian boreal forest",

abstract = "Ecosystem respiration (Reco) and its components, the autotrophic respiration (Ra) and soil respiration (Rs) are the essential indicators of the global carbon cycle. They are represented as functions of either temperature or soil moisture, or a combination of both in the widely-used Earth System Models (ESMs). Thus, it is difficult to evaluate the influence of other environmental factors (such as, precipitation, soil temperature, dissolved oxygen level and oxidation reduction potential (ORP)) on Ra, Rs and Reco. Here we introduced microbially mediated, detailed carbon cycle processes within our mechanistic model to address this issue. Dominance analysis using a multivariate approach was performed to find out the influence of individual environmental factors on Ra, Rs and Reco in the cold climate regions of Athabasca River Basin (ARB), Canada. Contribution of the 6 predictor variables, including air temperature, precipitation, soil temperature, water-filled pore space (WFPS) used as a proxy of soil moisture, dissolved oxygen level, and ORP, on Ra, Rs and Reco were estimated based on the R2 values originated from multiple regression analyses. Our results showed that the prevailing temperature (both air and soil) and dissolved oxygen levels are the major influencing factors on Ra, Rs and Reco. WFPS is found to be the least influential factor on respiration estimation. Output of this study can be used to consider the crucial roles of environmental drivers in Ra, Rs and Reco estimation in the development of future ESMs.",

keywords = "Autotrophic respiration, Canadian boreal forest, Carbon cycle, Cold climate region, Dissolved oxygen, Ecosystem respiration, Root respiration, SWAT, Soil respiration",

author = "Bhanja, {Soumendra N.} and Junye Wang",

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year = "2021",

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doi = "10.1016/j.ecolind.2021.107517",

language = "English",

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journal = "Ecological Indicators",

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AU - Bhanja, Soumendra N.

AU - Wang, Junye

PY - 2021/6

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N2 - Ecosystem respiration (Reco) and its components, the autotrophic respiration (Ra) and soil respiration (Rs) are the essential indicators of the global carbon cycle. They are represented as functions of either temperature or soil moisture, or a combination of both in the widely-used Earth System Models (ESMs). Thus, it is difficult to evaluate the influence of other environmental factors (such as, precipitation, soil temperature, dissolved oxygen level and oxidation reduction potential (ORP)) on Ra, Rs and Reco. Here we introduced microbially mediated, detailed carbon cycle processes within our mechanistic model to address this issue. Dominance analysis using a multivariate approach was performed to find out the influence of individual environmental factors on Ra, Rs and Reco in the cold climate regions of Athabasca River Basin (ARB), Canada. Contribution of the 6 predictor variables, including air temperature, precipitation, soil temperature, water-filled pore space (WFPS) used as a proxy of soil moisture, dissolved oxygen level, and ORP, on Ra, Rs and Reco were estimated based on the R2 values originated from multiple regression analyses. Our results showed that the prevailing temperature (both air and soil) and dissolved oxygen levels are the major influencing factors on Ra, Rs and Reco. WFPS is found to be the least influential factor on respiration estimation. Output of this study can be used to consider the crucial roles of environmental drivers in Ra, Rs and Reco estimation in the development of future ESMs.

AB - Ecosystem respiration (Reco) and its components, the autotrophic respiration (Ra) and soil respiration (Rs) are the essential indicators of the global carbon cycle. They are represented as functions of either temperature or soil moisture, or a combination of both in the widely-used Earth System Models (ESMs). Thus, it is difficult to evaluate the influence of other environmental factors (such as, precipitation, soil temperature, dissolved oxygen level and oxidation reduction potential (ORP)) on Ra, Rs and Reco. Here we introduced microbially mediated, detailed carbon cycle processes within our mechanistic model to address this issue. Dominance analysis using a multivariate approach was performed to find out the influence of individual environmental factors on Ra, Rs and Reco in the cold climate regions of Athabasca River Basin (ARB), Canada. Contribution of the 6 predictor variables, including air temperature, precipitation, soil temperature, water-filled pore space (WFPS) used as a proxy of soil moisture, dissolved oxygen level, and ORP, on Ra, Rs and Reco were estimated based on the R2 values originated from multiple regression analyses. Our results showed that the prevailing temperature (both air and soil) and dissolved oxygen levels are the major influencing factors on Ra, Rs and Reco. WFPS is found to be the least influential factor on respiration estimation. Output of this study can be used to consider the crucial roles of environmental drivers in Ra, Rs and Reco estimation in the development of future ESMs.

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KW - Canadian boreal forest

KW - Carbon cycle

KW - Cold climate region

KW - Dissolved oxygen

KW - Ecosystem respiration

KW - Root respiration

KW - SWAT

KW - Soil respiration

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Influence of environmental factors on autotrophic, soil and ecosystem respirations in Canadian boreal forest

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