Back to Search
Start Over
Impact of freeze-thaw cycles on greenhouse gas emissions in marginally productive agricultural land under different perennial bioenergy crops.
- Source :
-
Journal of environmental management [J Environ Manage] 2024 Apr; Vol. 357, pp. 120739. Date of Electronic Publication: 2024 Mar 28. - Publication Year :
- 2024
-
Abstract
- Knowledge of freeze-thaw-induced carbon (C) and nitrogen (N) cycling and concomitant nitrous oxide (N <subscript>2</subscript> O) and carbon dioxide (CO <subscript>2</subscript> ) emissions in perennial bioenergy crops is crucial to understanding the contribution of these crops in mitigating climate change through reduced greenhouse gas (GHG) emissions. In this study, a 49-day laboratory incubation experiment was conducted to compare the impact of freeze-thaw cycles on N <subscript>2</subscript> O and CO <subscript>2</subscript> emissions in different perennial bioenergy crops [miscanthus (Miscanthus giganteus L.), switchgrass (Panicum virgatum L.), and willow (Salix miyabeana L.)] to a successional site and to understand the processes controlling the N <subscript>2</subscript> O and CO <subscript>2</subscript> emissions in these crops. The results showed that freeze-thaw cycles caused a decline in dissolved organic C (DOC) and dissolved inorganic N (DIN) concentrations but enhanced the dissolved organic N (DON) and nitrate (NO <subscript>3</subscript> <superscript>-</superscript> ). Although, freeze-thaw decreased water stable soil aggregates in all the bioenergy crops and successional site, this did not have any significant impact on N <subscript>2</subscript> O and CO <subscript>2</subscript> emissions, suggesting that the N <subscript>2</subscript> O and CO <subscript>2</subscript> emitted during the freeze-thaw cycles may have originated mostly from cellular materials released from lysis and death of microbial biomass rather than from soil aggregate disruption. Cumulative N <subscript>2</subscript> O emissions measured over the 49-day incubation period ranged from 148 mg N <subscript>2</subscript> O-N m <superscript>-2</superscript> to 17 mg N <subscript>2</subscript> O-N m <superscript>-2</superscript> and were highest in miscanthus followed by willow, switchgrass, and successional site. Cumulative CO <subscript>2</subscript> on the other hand was highest in the successional site than any of the bioenergy crops and ranged from 25,262 mg CO <subscript>2</subscript> -C m <superscript>-2</superscript> to 15,403 mg CO <subscript>2</subscript> -C m <superscript>-2</superscript> after the 49 days. Higher N <subscript>2</subscript> O emissions in the miscanthus and willow than switchgrass and successional site were attributed to accelerated N losses as N <subscript>2</subscript> O. Results from our study indicate that managing perennial bioenergy crops on low productive agricultural lands to reduce freeze-thaw related GHG emissions and climate change mitigation is dependent on the crop species grown.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1095-8630
- Volume :
- 357
- Database :
- MEDLINE
- Journal :
- Journal of environmental management
- Publication Type :
- Academic Journal
- Accession number :
- 38552522
- Full Text :
- https://doi.org/10.1016/j.jenvman.2024.120739