Antecedent conditions determine the biogeochemical response of coastal soils to seawater exposure

Sengupta, Aditi; Stegen, James C.; Bond-Lamberty, Ben; Rivas-Ubach, Albert; Zheng, Jianqiu; Handakumbura, Pubudu P.; Norris, Cooper; Peterson, Matthew J.; Yabusaki, Steven B.; Bailey, Vanessa L.; Ward, Nicholas D.

doi:10.1016/j.soilbio.2020.108104

Antecedent conditions determine the biogeochemical response of coastal soils to seawater exposure

Journal Article · Mon Nov 30 04:00:00 EST 2020 · Soil Biology and Biochemistry

DOI:https://doi.org/10.1016/j.soilbio.2020.108104· OSTI ID:1737552

^[1]; ^[1]; ^[1]; Rivas-Ubach, Albert ^[1]; ^[1]; Handakumbura, Pubudu P. ^[1]; Norris, Cooper ^[2]; ^[3]; ^[1]; Bailey, Vanessa L. ^[1]; ^[4]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Rochester Inst. of Technology, Rochester, NY (United States)
Texas A & M Univ., College Station, TX (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)

Coastal landscapes are increasingly exposed to seawater due to sea level rise and extreme weather events. The biogeochemical responses of these vulnerable ecosystems are poorly understood, limiting our ability to predict how their role in local and global biogeochemical cycles will shift under future conditions. Here we evaluate how antecedent conditions influence the biogeochemical response of soil to seawater inundation events based on a 42-day laboratory incubation experiment with soils collected from a natural salinity gradient across a coastal floodplain. We quantified influences of seawater inundation on intact soil cores through high-frequency carbon dioxide (CO₂) and methane (CH₄) gas fluxes measurements as well as ultrahigh resolution characterization of organic matter chemistry and metabolites. Mean CO₂ and CH₄ fluxes were higher after inundation compared to control cores for soils that had low in situ salinity. Soils with low in situ salinity also exhibited significant shifts in organic matter profiles after inundation, with surficial soils (0-7.5 cm) becoming more enriched in phenolic compounds, compared to deeper soils (7.5-15 cm). The number of biochemical transformations inferred from mass spectrometry increased significantly after inundation for soils with low in situ salinity, and a trend of decreasing thermodynamic favorability with increasing salinity was observed, suggesting an increase in microbial activity following inundation. Our results suggest that seawater inundation of low-salinity terrestrial environments can lead to increased microbial activity, preferential depletion of more thermodynamically favorable compounds, and increased soil carbon release. Finally, we conclude that the biogeochemical impacts of future seawater exposure will be modulated by antecedent conditions associated with landscape position within coastal watersheds.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1737552

Alternate ID(s):: OSTI ID: 1810967

Report Number(s):: PNNL-SA--154783

Journal Information:: Soil Biology and Biochemistry, Journal Name: Soil Biology and Biochemistry Vol. 153; ISSN 0038-0717

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Antecedent conditions determine the biogeochemical response of coastal soils to seawater exposure

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