Soil N2O and CH4 emissions from fodder maize production with and without riparian bufer strips of difering vegetation

A - Papers appearing in refereed journals

Dlamini, J., Cardenas, L. M., Tesfamariam, E. H., Dunn, R., Evans, J., Hawkins, J. M. B., Blackwell, M. S. A. and Collins, A. L. 2022. Soil N2O and CH4 emissions from fodder maize production with and without riparian bufer strips of difering vegetation. Plant and Soil. https://doi.org/10.1007/s11104-022-05426-0

AuthorsDlamini, J., Cardenas, L. M., Tesfamariam, E. H., Dunn, R., Evans, J., Hawkins, J. M. B., Blackwell, M. S. A. and Collins, A. L.
Abstract

Purpose Nitrous oxide (N2O) and methane (CH4) are some of the most important greenhouse gases in the atmosphere of the 21st century. Vegetated riparian bufers are primarily implemented for their water quality functions in agroecosystems. Their location in agricultural landscapes allows them to intercept
and process pollutants from adjacent agricultural land. They recycle organic matter, which increases soil carbon (C), intercept nitrogen (N)-rich runof from adjacent croplands, and are seasonally anoxic. Thus processes producing environmentally harmful gases including N2O and CH4 are promoted. Against this context, the study quantifed atmospheric losses between a cropland and vegetated riparian bufers that serve it.Methods Environmental variables and simultaneous N2O and CH4 emissions were measured for a 6-month period in a replicated plot-scale facility comprising
maize (Zea mays L.). A static chamber was used to measure gas emissions. The cropping was served by three vegetated riparian bufers, namely: (i) grass riparian bufer; (ii) willow riparian bufer and; (iii) woodland riparian bufer, which were compared with a no-bufer control. Results The no-bufer control generated the largestcumulative N2O emissions of 18.9 kg ha−1(95% confdence interval: 0.5–63.6) whilst the maize crop upslope generated the largest cumulative CH4 emissions (5.1±0.88 kg ha−1). Soil N2O and CH4-based global warming potential (GWP) were lower in the willow (1223.5±362.0 and 134.7±74.0 kg CO2-eq. ha−1 year−1, respectively) and woodland (1771.3±800.5 and 3.4±35.9 kg CO2-eq. ha−1 year−1, respectively) riparian bufers. Conclusions Our results suggest that in maize production and where no riparian bufer vegetation is introduced for water quality purposes (no bufer control), atmospheric CH4 and N2O concerns may result

KeywordsNitrous oxide ; Methane; Maixe; Vegetated riparian bufer strips
Year of Publication2022
JournalPlant and Soil
Digital Object Identifier (DOI)https://doi.org/10.1007/s11104-022-05426-0
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeImpacts of different vegetation in riparian buffer strips on hydrology and water quality
S2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
S2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Publisher's version
Output statusPublished
Publication dates
Online11 Apr 2022
Publication process dates
Accepted02 Apr 2022
PublisherSpringer
ISSN0032-079X

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