Stressed crops emit more methane despite the mitigating effects of elevated carbon dioxide
Mirwais M. Qaderi A B C and David M. Reid A
+ Author Affiliations
- Author Affiliations
A Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
B Present address: Department of Biology, Mount Saint Vincent University, 166 Bedford Highway, Halifax, Nova Scotia B3M 2J6, Canada.
C Corresponding author. Email: mirwais.qaderi@msvu.ca
Functional Plant Biology 38(2) 97-105 https://doi.org/10.1071/FP10119
Submitted: 28 May 2010 Accepted: 16 December 2010 Published: 1 February 2011
Abstract
Recent studies using single environmental variables show that under aerobic conditions terrestrial plants can emit methane (CH4). However, the effects of multiple environmental factors – as components of global climate change – on aerobic CH4 emissions have been little studied. We examined the combined effects of temperature, carbon dioxide (CO2) and watering regime on CH4 emissions from six commonly cultivated crop species: faba bean, sunflower, pea, canola, barley and wheat. Plants were grown from seeds in controlled-environment growth chambers under two temperature regimes (24°C day/20°C night and 30°C day/26°C night), two CO2 concentrations (380 and 760 µmol mol–1) and two watering regimes (well watered and water stressed). Plants were grown first under 24/20°C for 1 week from sowing, and then placed under experimental conditions for a further week. After the specified time, plant growth, gas exchange and CH4 emission rates were determined. Our results revealed that higher temperature and water stress significantly enhance CH4 emissions from plants, whereas elevated CO2 had the opposite effect and partially reverses the promotive effects of these factors. We suggest that the despite the mitigating effects of rising atmospheric CO2, CH4 emission may be higher in the face of ongoing global climate change in warmer and drier environments.
Additional keywords: aerobic methane emission, gas exchange, global climate change, high temperature, plant growth, water stress.
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