Substantial carbon loss respired from a corn–soybean agroecosystem highlights the importance of careful management as we adapt to changing climate

Moore, Caitlin E; Gibson, Christy D; Miao, Guofang; Dracup, Evan C; Gomez-Casanovas, Nuria; Masters, Michael D; Miller, Jesse; C von Haden, Adam; Meyers, Tilden; DeLucia, Evan H; Bernacchi, Carl J

doi:10.1088/1748-9326/ac661a

i

Substantial carbon loss respired from a corn–soybean agroecosystem highlights the importance of careful management as we adapt to changing climate

Public Domain

2022
By Moore, Caitlin E ; Gibson, Christy D ; Miao, Guofang ; ...

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Journal Title:

Environmental Research Letters
Personal Author:

Moore, Caitlin E ; Gibson, Christy D ; Miao, Guofang ; Dracup, Evan C ; Gomez-Casanovas, Nuria ; Masters, Michael D ; Miller, Jesse ; C von Haden, Adam ; Meyers, Tilden ; DeLucia, Evan H ; Bernacchi, Carl J
NOAA Program & Office:

ARL (Air Resources Laboratory) ; OAR (Oceanic and Atmospheric Research)
Description:

Understanding agroecosystem carbon (C) cycle response to climate change and management is vital for maintaining their long-term C storage. We demonstrate this importance through an in-depth examination of a ten-year eddy covariance dataset from a corn–corn–soybean crop rotation grown in the Midwest United States. Ten-year average annual net ecosystem exchange (NEE) showed a net C sink of −0.39 Mg C ha−1 yr−1. However, NEE in 2014 and 2015 from the corn ecosystem was 3.58 and 2.56 Mg C ha−1 yr−1, respectively. Most C loss occurred during the growing season, when photosynthesis should dominate and C fluxes should reflect a net ecosystem gain. Partitioning NEE into gross primary productivity (GPP) and ecosystem respiration (ER) showed this C ‘burp’ was driven by higher ER, with a 51% (2014) and 57% (2015) increase from the ten-year average (15.84 Mg C ha−1 yr−1). GPP was also higher than average (16.24 Mg C ha−1 yr−1) by 25% (2014) and 37% (2015), but this was not enough to offset the C emitted from ER. This increased ER was likely driven by enhanced soil microbial respiration associated with ideal growing season climate, substrate availability, nutrient additions, and a potential legacy effect from drought.
Keywords:

General Environmental Science Public Health, Environmental And Occupational Health Renewable Energy, Sustainability And The Environment Public Health, Environmental And Occupational Health Renewable Energy, Sustainability And The Environment Public Health, Environmental And Occupational Health Renewable Energy, Sustainability And The Environment
Source:

Environmental Research Letters, 17(5), 054029
DOI:

https://doi.org/10.1088/1748-9326/ac661a
ISSN:

1748-9326
Format:

PDF
Publisher:

IOP Publishing
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
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Library
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urn:sha-512:204eac131bd06d7969bcb126eed645568fbbd6376973483b21264ab8623a532d0104687de7abf2a222b0969fa0a000fa7ff1492c312b10fb597d4b22c4086d69
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https://repository.library.noaa.gov/view/noaa/64051/noaa_64051_DS1.pdf
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