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\begin{document}

\title{Autotrophic respiration dominates ecosystem respiration at Canadian
boreal forest}



\author[1]{Soumendra Nath Bhanja}%
\author[2]{Junye Wang}%
\author[3]{Roland Bol}%
\affil[1]{Indian Institute of Science}%
\affil[2]{Athabasca University}%
\affil[3]{Institute of Bio- and Geosciences}%


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  \date{May 18, 2024}


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\begin{abstract}
Most of the Earth System Models (ESMs) rely on empirical functions for
decomposition of litter with multiple soil carbon pools decaying at
different rates to estimate R\textsubscript{eco} variations and its
partitioning into autotrophic (R\textsubscript{a}) and heterotrophic
respiration (R\textsubscript{h}) in relation to variation in temperature
and soil water content. However, microbially-mediated litter
decomposition schemes are very scarce in ESMs. Microbial enzymatic
processes are integral parts in litter as well as soil organic matter
(SOM) decomposition. Here we developed a mechanistic model comprising of
multiple hydro-biogeochemical modules to explicitly incorporate
microbially-enzymatic litter decomposition and decomposition of SOM for
estimating regional-scale R\textsubscript{a}, R\textsubscript{h} and
R\textsubscript{eco}. Modeled annual mean R\textsubscript{eco} values
are found varying from 1000 to 8000 kg C ha\textsuperscript{-1}
yr\textsuperscript{-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 R\textsubscript{a} and
R\textsubscript{h} are varying within 800-6000 kg C
ha\textsuperscript{-1} yr\textsuperscript{-1} and 500-3500 kg C
ha\textsuperscript{-1} yr\textsuperscript{-1}, respectively.
R\textsubscript{a} generally dominates R\textsubscript{eco} with nearly
30-80\% 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. Modeling
the partitioning of R\textsubscript{eco} to R\textsubscript{a}, and
R\textsubscript{h} are critical to understanding future climate change
feedbacks and to help reduce uncertainties in ESMs in the boreal and
subarctic regions.%
\end{abstract}%



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\verb`supporting-information.docx`  available at \url{https://authorea.com/users/543267/articles/601217-autotrophic-respiration-dominates-ecosystem-respiration-at-canadian-boreal-forest}

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