@article{Barton2013,
title = {Is liming soil a strategy for mitigating nitrous oxide emissions from semi-arid soils?},
author = {Louise Barton and D.B. Gleeson and L.D. Maccarone and L.P. Zúñiga and D.V. Murphy},
doi = {10.1016/j.soilbio.2013.02.014},
year = {2013},
date = {2013-07-01},
journal = {Soil Biology & Biochemistry},
volume = {62},
pages = {28–35},
abstract = {Nitrous oxide (N_{2}O) emissions in semi-arid regions are often greater following summer rainfall events when the soil is fallow, than in response to N fertiliser applications during crop growth. Nitrogen fertiliser management strategies are therefore likely to be ineffective at mitigating N_{2}O emissions from these cropped agricultural soils. Here we examined the influence of raising soil pH on N_{2}O emissions, nitrification rates, and both nitrifier and denitrifier populations following simulated summer rainfall events. The soil pH was raised by applying lime to a field site 12 months before conducting the laboratory experiment, resulting in soil of contrasting pH (4.21 or 6.34). Nitrous oxide emissions ranged from 0 when the soil was dry to 0.065 µg N_{2}O–N g dry soil-1 h-1 following soil wetting; which was attributed to both denitrification and nitrification. Increasing soil pH only decreased N_{2}O emissions when losses were associated with nitrification, and increased amoA gene copy numbers. We propose increasing soil pH as a strategy for decreasing soil N_{2}O emissions from acidic soils following summer rainfall in semi-arid regions when emissions result from nitrification.},
keywords = {Soil carbon in nitrous oxide emissions},
pubstate = {published},
tppubtype = {article}
}

@article{Barton2013,
title = {Influence of crop rotation and liming on greenhouse gas emissions from a semi-arid soil},
author = {Louise Barton and Daviel V.Murphy and Klaus Butterbach-Bahl},
doi = {10.1016/j.agee.2013.01.003},
year = {2013},
date = {2013-03-01},
pages = {23 – 32},
abstract = {Semi-arid lands represent one fifth of the global land area but our understanding of greenhouse gas fluxes from these regions is poor. We investigated if inclusion of a grain legume and/or lime in a crop rotation altered greenhouse gas emissions from an acidic soil. Nitrous oxide (N_{2}O) and methane (CH_{4}) fluxes were measured from a rain-fed, cropped soil in a semi-arid region of Australia for two years on a sub-daily basis. The randomised-block design included two cropping rotations (lupin–wheat, wheat–wheat) by two liming treatments (0, 3.5 t ha-1) by three replicates. The lupin–wheat rotation only received N fertilizer during the wheat phase (20 kg N ha-1), while the wheat–wheat received 125 kg N ha-1 during the two year study. Fluxes were measured using soil chambers connected to a fully automated system that measured N_{2}O and CH_{4} by gas chromatography. Nitrous oxide fluxes were low (-1.4 to 9.2 g N_{2}O-N ha-1 day-1), and less than those reported for arable soils in temperate climates. Including a grain legume in the cropping rotation did not enhance soil N_{2}O; total N_{2}O losses were approximately 0.1 kg N_{2}O-N ha-1 after two years for both lupin–wheat and wheat–wheat rotations when averaged across liming treatment. Liming decreased cumulative N_{2}O emissions from the wheat–wheat rotation by 30% by lowering the contribution of N_{2}O emissions following summer–autumn rainfall events, but had no effect on N_{2}O emissions from the lupin–wheat rotation. Daily CH_{4} fluxes ranged from -14 to 5 g CH_{4}-C ha-1 day-1. Methane uptake after two years was lower from the wheat–wheat rotation (601 g CH_{4}-C ha-1) than from either lupin–wheat rotations (967 g CH_{4}-C ha-1), however liming the wheat–wheat rotation increased CH_{4} uptake (1078 g CH_{4}-C ha-1) to a value similar to the lupin–wheat rotation. Liming provides a strategy for lowering on-farm greenhouse gas emissions from N fertilised soils in semi-arid environments via decreased N_{2}O fluxes and increased CH_{4} uptake.},
note = {Agriculture, Ecosystems and Environment, 167 (2013) Pp. 23 – 32 Barton et al. 2013 (AGEE)},
keywords = {Soil carbon in nitrous oxide emissions},
pubstate = {published},
tppubtype = {article}
}

@article{Barton2010,
title = {Soil N_{2}O fluxes are low from a grain-legume crop grown in a semi-arid climate},
author = {Louise Barton and Klaus Butterbach-Bahl and Ralph Kiese and Daniel Murphy},
url = {http://soilscienceaustralia.com.au/19th-world-congress-of-soil-science},
year = {2010},
date = {2010-08-01},
pages = {224-227},
abstract = {Understanding nitrous oxide (N_{2}O) fluxes from grain-legume crops in semi-arid and arid regions is necessary if we are to improve our knowledge of global terrestrial N_{2}O losses resulting from biological N fixation. Nitrous oxide fluxes were measured from a rain-fed soil, cropped to grain-legume in a semi-arid region of south-western Australia for one year on a sub-daily basis. The site included plots planted to narrow-leafed lupin (Lupinus angustifolius; 'lupin') and plots left bare ('no lupin'), with no N fertiliser applied to treatments. Fluxes were measured using soil chambers connected to a fully automated system that measured N_{2}O using gas chromatography. Daily N_{2}O fluxes were low (-0.5-24 g N_{2}O-N/ha day-1), not different between treatments, and culminated in an annual loss of 118 g N_{2}O-N/ha. Greatest daily N_{2}O fluxes occurred during the post-harvest period, and following a series of summer rainfall events. At this time of the year soil conditions were conducive to soil microbial N_{2}O production: elevated soil water content, available N, and warm soil temperatures (>25 °C). To the best of our knowledge, this is the first paper to report annual N_{2}O emissions from a rain-fed, grain legume crop in a Mediterranean-like semi-arid region.},
note = {Gilkes, R.J, Prakongkep, N. (Eds.). Proceedings 19th World Congress of Soil Science 2010; Published on DVD; http://www.iuss.org; Congress Symposium 4; Greenhouse gases from soils, IUSS, Brisbane, pp. 224-227.},
keywords = {Soil carbon in nitrous oxide emissions},
pubstate = {published},
tppubtype = {article}
}