The impact of drought and rewetting on <scp>N<sub>2</sub>O</scp> emissions from soil in temperate and <scp>Mediterranean</scp> climates

Barrat, Harry A.; Evans, J.; Chadwick, David R.; Clark, Ian M.; Cocq, Kate Le; Cardenas, L. M.

doi:10.1111/ejss.13015

Cited by 48 publications

(15 citation statements)

References 39 publications

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“…In a recent literature review and meta-analysis, Barrat et al (2020) found that WFPS was a significant explanatory variable for N 2 O emissions and this was affected by the prior moisture status of the soil. In our experiments, the soils were prepared in a standard manner, so only the final moisture status at the start of the incubation differed.…”

Section: Discussionmentioning

confidence: 99%

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

et al. 2021

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contribution of denitrification increased with increasing WFPS, but only became dominant at 85% WFPS. While denitrification still showed to be most important at high and nitrification at lower WFPS, the actual % WFPS values were not as expected and highlight the fact that WFPS is a contributor, but not the sole/most important parameter determining the type of N-transformation processes taking place.

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Section: Discussionmentioning

confidence: 99%

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

et al. 2021

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“…Accordingly, the speed of the SWC decrease could be included in N 2 O ux models for the drought period. This interpretation is supported by Barrat et al58 review on drought and rewetting effects on soil N 2 O uxes indicating that the larger the WFPS change, the larger the N 2 O pulse with the the largest emissions occurred at 70% WFPS. In our Freeze-Thaw period, a positive correlation between the near-oor air temperature and N 2 O ux was observed(Fig.…”

mentioning

confidence: 59%

“…Soil water content was the main factor associated with hot moments of N 2 O emission from soils, and it has been argued that drought and rewetting trigger such events by different mechanisms 58 . Likewise, we propose that hot moments in current study were caused by a variety of different mechanisms.…”

Section: Relationships Of N 2 O Ux and Environmental Parametersmentioning

confidence: 99%

Canopy airspace of riparian forest mitigates soil N2O emission during hot moments

Mander

Krasnova

Escuer-Gatius

et al. 2020

Preprint

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Riparian forests are known as hot spots of N cycling in landscapes and climate warming speeds up the cycle. Here we present results from the first multi-annual high temporal-frequency study of soil, stem and ecosystem (eddy covariance) fluxes of N2O from a typical riparian forest in Europe.Hot moments (extreme events of N2O emission) last a quarter of the study period but contribute more than a half of soil fluxes. For the first time we demonstrate that high soil emissions of N2O do not reach the ecosystem level. During the drought onset, soil N2O emission peaks at intermediate soil water content. Rapid water content change is the main determinant of the emissions. The freeze–thaw period is another hot moment. However, according to the eddy covariance measurements the riparian forest is a modest source of N2O. We propose photochemical reactions and dissolution in canopy-space water as consumption mechanisms.

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“…In contrast, HMs are regulated by abiotic or biotic controls that are transient at a given location to elevate nutrient pools, processing rates, or uxes. For example, pulses of nutrients or microbial activity may only be activated immediately following re-wetting events of dry soil (McClain et al 2003;Harms and Grimm 2008;Barcellos et al 2018;Barrat et al 2021), or immediately after catastrophic disturbances such as wild re (Zhao et al 2021). In addition, dead and decaying roots or macrofauna can create biopores that accrue nutrients and serve as HMs of microbial activity (Kuzyakov and Blagodatskaya 2015;Hoang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

The Median Isn’t the Message: Elucidating Soil Nutrient Hot Spots

Barnes

Johnson

Hart

2023

Preprint

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Soil nutrient distribution is heterogeneous in space and time, potentially altering nutrient acquisition by trees and microorganisms. Ecologists have distinguished “hot spots” (HSs) as areas with enhanced and sustained rates of nutrient fluxes relative to the surrounding soil matrix. We evaluated the spatial and temporal patterns in nutrient flux HSs in two mixed-conifer forest soils by repeatedly sampling the soil solution at the same spatial locations (horizontally and vertically) over multiple seasons and years using ion exchange resins incubated in situ. The climate of these forests is Mediterranean, with intense fall rains occurring following summers with little precipitation, and highly variable winter snowfall. Hot spots formed most often for NO3- and Na+. Although nutrient HSs often occurred in the same spatial location multiple times, HSs persisted more often for NO3-, NH4+, and PO43- and were more transient for Na+, Ca2+, and Mg2+. Sampling year (annual precipitation ranged from 701 to 1216 mm) impacted the occurrence of HSs for most nutrients, but season was only significant for PO43-, NH4+, NO3-, and Na+, with HSs forming more often after fall rains than spring snowmelt. The frequency of HSs significantly decreased with soil depth for all nutrients, forming most commonly immediately below the surficial organic horizon. Although HSs accounted for less than 17% of the sampling volume, they were responsible for 56-88% of PO43-, NH4+, and NO3- fluxes. Our results suggest that macronutrient HSs have a disproportional contribution to soil biogeochemical structure, with implications for vegetation nutrient acquisition strategies and biogeochemical models.

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The impact of drought and rewetting on N₂O emissions from soil in temperate and Mediterranean climates

Cited by 48 publications

References 39 publications

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

Canopy airspace of riparian forest mitigates soil N2O emission during hot moments

The Median Isn’t the Message: Elucidating Soil Nutrient Hot Spots

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The impact of drought and rewetting on N2O emissions from soil in temperate and Mediterranean climates

Cited by 48 publications

References 39 publications

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil

Canopy airspace of riparian forest mitigates soil N2O emission during hot moments

The Median Isn’t the Message: Elucidating Soil Nutrient Hot Spots

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The impact of drought and rewetting on N₂O emissions from soil in temperate and Mediterranean climates