Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems

Abstract Soil microbes drive decomposition of soil organic matter (SOM) and regulate soil carbon (C) dynamics. Process‐based models have been developed to quantify changes in soil organic carbon (SOC) and carbon dioxide (CO2) fluxes in agricultural ecosystems. However, microbial processes related to...

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Autores principales:	Jia Deng, Steve Frolking, Rajen Bajgain, Carolyn R. Cornell, Pradeep Wagle, Xiangming Xiao, Jizhong Zhou, Jeffrey Basara, Jean Steiner, Changsheng Li
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	SOC change CO2 flux SOM decomposition microbial physiology farming management practices biogeochemical modeling Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/0da5db16a0f849c9bafc2652c434cf0a
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spelling	oai:doaj.org-article:0da5db16a0f849c9bafc2652c434cf0a2021-11-30T08:40:32ZImproving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems1942-246610.1029/2021MS002752https://doaj.org/article/0da5db16a0f849c9bafc2652c434cf0a2021-11-01T00:00:00Zhttps://doi.org/10.1029/2021MS002752https://doaj.org/toc/1942-2466Abstract Soil microbes drive decomposition of soil organic matter (SOM) and regulate soil carbon (C) dynamics. Process‐based models have been developed to quantify changes in soil organic carbon (SOC) and carbon dioxide (CO2) fluxes in agricultural ecosystems. However, microbial processes related to SOM decomposition have not been, or are inadequately, represented in these models, limiting predictions of SOC responses to changes in microbial activities. In this study, we developed a microbial‐mediated decomposition model based on a widely used biogeochemical model, DeNitrification‐DeComposition (DNDC), to simulate C dynamics in agricultural ecosystems. The model simulates organic matter decomposition, soil respiration, and SOC formation by simulating microbial and enzyme dynamics and their controls on decomposition, and considering impacts of climate, soil, crop, and farming management practices (FMPs) on C dynamics. When evaluated against field observations of net ecosystem CO2 exchange (NEE) and SOC change in two winter wheat systems, the model successfully captured both NEE and SOC changes under different FMPs. Inclusion of microbial processes improved the model's performance in simulating peak CO2 fluxes induced by residue return, primarily by capturing priming effects of residue inputs. We also investigated impacts of microbial physiology, SOM, and FMPs on soil C dynamics. Our results demonstrated that residue or manure input drove microbial activity and predominantly regulated the CO2 fluxes, and manure amendment largely regulated long‐term SOC change. The microbial physiology had considerable impacts on the microbial activities and soil C dynamics, emphasizing the necessity of considering microbial physiology and activities when assessing soil C dynamics in agricultural ecosystems.Jia DengSteve FrolkingRajen BajgainCarolyn R. CornellPradeep WagleXiangming XiaoJizhong ZhouJeffrey BasaraJean SteinerChangsheng LiAmerican Geophysical Union (AGU)articleSOC changeCO2 fluxSOM decompositionmicrobial physiologyfarming management practicesbiogeochemical modelingPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	SOC change CO2 flux SOM decomposition microbial physiology farming management practices biogeochemical modeling Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	SOC change CO2 flux SOM decomposition microbial physiology farming management practices biogeochemical modeling Physical geography GB3-5030 Oceanography GC1-1581 Jia Deng Steve Frolking Rajen Bajgain Carolyn R. Cornell Pradeep Wagle Xiangming Xiao Jizhong Zhou Jeffrey Basara Jean Steiner Changsheng Li Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
description	Abstract Soil microbes drive decomposition of soil organic matter (SOM) and regulate soil carbon (C) dynamics. Process‐based models have been developed to quantify changes in soil organic carbon (SOC) and carbon dioxide (CO2) fluxes in agricultural ecosystems. However, microbial processes related to SOM decomposition have not been, or are inadequately, represented in these models, limiting predictions of SOC responses to changes in microbial activities. In this study, we developed a microbial‐mediated decomposition model based on a widely used biogeochemical model, DeNitrification‐DeComposition (DNDC), to simulate C dynamics in agricultural ecosystems. The model simulates organic matter decomposition, soil respiration, and SOC formation by simulating microbial and enzyme dynamics and their controls on decomposition, and considering impacts of climate, soil, crop, and farming management practices (FMPs) on C dynamics. When evaluated against field observations of net ecosystem CO2 exchange (NEE) and SOC change in two winter wheat systems, the model successfully captured both NEE and SOC changes under different FMPs. Inclusion of microbial processes improved the model's performance in simulating peak CO2 fluxes induced by residue return, primarily by capturing priming effects of residue inputs. We also investigated impacts of microbial physiology, SOM, and FMPs on soil C dynamics. Our results demonstrated that residue or manure input drove microbial activity and predominantly regulated the CO2 fluxes, and manure amendment largely regulated long‐term SOC change. The microbial physiology had considerable impacts on the microbial activities and soil C dynamics, emphasizing the necessity of considering microbial physiology and activities when assessing soil C dynamics in agricultural ecosystems.
format	article
author	Jia Deng Steve Frolking Rajen Bajgain Carolyn R. Cornell Pradeep Wagle Xiangming Xiao Jizhong Zhou Jeffrey Basara Jean Steiner Changsheng Li
author_facet	Jia Deng Steve Frolking Rajen Bajgain Carolyn R. Cornell Pradeep Wagle Xiangming Xiao Jizhong Zhou Jeffrey Basara Jean Steiner Changsheng Li
author_sort	Jia Deng
title	Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
title_short	Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
title_full	Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
title_fullStr	Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
title_full_unstemmed	Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems
title_sort	improving a biogeochemical model to simulate microbial‐mediated carbon dynamics in agricultural ecosystems
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/0da5db16a0f849c9bafc2652c434cf0a
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Improving a Biogeochemical Model to Simulate Microbial‐Mediated Carbon Dynamics in Agricultural Ecosystems

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