Multivariate regulation of soil CO2 and N2O pulse emissions from agricultural soils
Abstract
Climate and land-use models project increasing occurrence of high temperature and water deficit in both agricultural production systems and terrestrial ecosystems. Episodic soil wetting and subsequent drying may increase the occurrence and magnitude of pulsed biogeochemical activity, affecting carbon (C) and nitrogen (N) cycles and influencing greenhouse gas (GHG) emissions. In this study, we provide the first data to explore the responses of carbon dioxide (CO2 ) and nitrous oxide (N2 O) fluxes to (i) temperature, (ii) soil water content as percent water holding capacity (%WHC), (iii) substrate availability throughout, and (iv) multiple soil drying and rewetting (DW) events. Each of these factors and their interactions exerted effects on GHG emissions over a range of four (CO2 ) and six (N2 O) orders of magnitude. Maximal CO2 and N2 O fluxes were observed in environments combining intermediate %WHC, elevated temperature, and sufficient substrate availability. Amendments of C and N and their interactions significantly affected CO2 and N2 O fluxes and altered their temperature sensitivities (Q10 ) over successive DW cycles. C amendments significantly enhanced CO2 flux, reduced N2 O flux, and decreased the Q10 of both. N amendments had no effect on CO2 flux and increased N2 O flux, while significantly depressing the Q10 for CO2 , and having no effect on the Q10 for N2 O. The dynamics across DW cycles could be attributed to changes in soil microbial communities as the different responses to wetting events in specific group of microorganisms, to the altered substrate availabilities, or to both. The complex interactions among parameters influencing trace gas fluxes should be incorporated into next generation earth system models to improve estimation of GHG emissions.
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Remaining NO3- might be problematic in the winter season under field conditions, particularly in almost water-saturated soils after fertilization, after incorporation of crop residues, but also after weather-induced pulses of N mineralization.
“Nonetheless, remaining NO3- might be problematic in the winter season under field conditions (Kaiser and Ruser, 2000), particularly in almost water-saturated soils after fertilization, after incorporation of crop residues, but also after weather-induced pulses of N mineralization (Liang et al., 2016).”
From Potential of Wheat Straw, Spruce Sawdust, and Lignin as High Organic Carbon Soil Amendments to Improve Agricultural Nitrogen Retention Capacity: An Incubation Study (2018) · cites this paper as Liang et al., 2016
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- Authors
- Liang, L. L., Grantz, D. A., & Jenerette, G. D.
- Affiliations
- Department of Botany and Plant Sciences University of California Riverside CA 92521 USA
- University of California, Riverside (US)
- Corresponding author
- Jenerette, G. Darrel
- ORCID
- Jenerette, G. Darrel
- Venue
- Global Change Biology
- Publisher
- Wiley
- Published
- 2016-01-06
- Volume
- 22
- Issue
- 3
- Pages
- 1286-1298
- ISSN
- 1354-1013 (ISSN-L)
- 1365-2486
- OpenAlex
- W1929892780
- Cited by
- 78
- References
- 88
- Citations by year
- 2026: 6 · 2025: 8 · 2024: 7 · 2023: 11 · 2022: 8 · 2021: 6 · 2020: 14 · 2019: 1 · 2018: 13 · 2017: 4
- FWCI
- 7.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Global Change Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- University of California, Riverside
- University of California
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Environmental Science › Ecology › Peatlands and Wetlands Ecology
- Physical Sciences › Engineering › Civil and Structural Engineering › Soil and Unsaturated Flow
- Keywords
- soil CO2 efflux, nitrous oxide emissions, soil drying and rewetting, soil water holding capacity, temperature sensitivity, Q10, carbon amendments, nitrogen amendment, soil microbial communities, greenhouse gas fluxes, agricultural soils, soil carbon and nitrogen cycling, Earth system models
- MeSH terms
- Agriculture, Air Pollutants, California, Carbon Dioxide, Environmental Monitoring, Nitrous Oxide, Soil, Multivariate Analysis
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