A - Papers appearing in refereed journals
Barrat, H., Evans, J., Chadwick, D. R., Clark, I. M., Le Cocq, K. and Cardenas, L. M. 2020. The impact of drought and rewetting on N2O emissions from soil in temperate and Mediterranean climates. European Journal of Soil Science. https://doi.org/10.1111/ejss.13015
Authors | Barrat, H., Evans, J., Chadwick, D. R., Clark, I. M., Le Cocq, K. and Cardenas, L. M. |
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Abstract | The potential for soils to produce nitrous oxide (N2O) is impacted by past moisture conditions; however, the extent of this impact is not fully understood. We conducted the first review of this, using two literature searches and a meta-analysis. We found 36 studies out of a possible 735 that described experiments where soil moisture conditions had been controlled, such that the impact of antecedent moisture levels could be separated from contemporary moisture levels and attributed to N2O emissions. Of those studies, 14 (130 data points) used the appropriate experimental design and presented suitable data that could be standardized for the meta-analysis. We found that the degree to which the soil was rewetted and the water filled pore space (WFPS) the soil was brought to were significant explanatory variables (p = < 0.0001). The larger the difference between the dry and wet states of the soil and the higher the WFPS of the soil after rewetting, the larger the hot moment, with an exponential increase once the soil is anaerobic. Substrate availability and fertiliser quantity and type were also important controls on the amount of N2O emitted during the hot moment (p = < 0.0001). However, controls with a constant WFPS can have the same anaerobicity and substrate concentrations, yet much lower emissions, so we suggest that it is the bioavailability of and how the substrates are utilized by the microbial community, and thus how they are primed by the drought, that is the main causal mechanism. Unfortunately, there is still |
Keywords | Denitrification; Drought; Dry wet cycles; Legacy; Nitrous oxide; Soil moisture |
Year of Publication | 2020 |
Journal | European Journal of Soil Science |
Digital Object Identifier (DOI) | https://doi.org/10.1111/ejss.13015 |
Open access | Published as non-open access |
Funder | Biotechnology and Biological Sciences Research Council |
Funder project or code | S2N - Soil to Nutrition - Work package 1 (WP1) - Optimising nutrient flows and pools in the soil-plant-biota system |
S2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality | |
Output status | Published |
Publication dates | |
Online | 21 Jun 2020 |
Publication process dates | |
Accepted | 18 Jun 2020 |
Publisher | Wiley |
ISSN | 1351-0754 |
Permalink - https://repository.rothamsted.ac.uk/item/982w0/the-impact-of-drought-and-rewetting-on-n2o-emissions-from-soil-in-temperate-and-mediterranean-climates
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