Controlling light quality and intensity can reduce N2O and CO2 emissions of mature aging rice

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• 作者：Shengguang Xu ; Bing Li ; Yujie Xia ; Lei Yu ; Li Lin ; Zebin Chen and Yuwu Li
• 刊名：Greenhouse Gases: Science and Technology
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：6
• 期：3
• 页码：308-318
• 全文大小：1910K
• ISSN：2152-3878

文摘

N₂O, CO₂, and CH₄ are important greenhouse gases (GHGs) in paddy fields, and rice plants play an important role in GHG emissions in paddy fields. However, the relationship between light and rice plant GHG emissions is unclear. In this study, we monitored N₂O, CO₂, and CH₄ emissions of mature aging rice under different light qualities and intensities. The results showed that (i) under natural sunlight, the rice phyllosphere N₂O emission rate was 22.94 μg pot^–1 h^–1, accounting for 60% of the whole rice plant total N₂O-N evaporation loss. The CO₂ emission rates from the phyllosphere and the root system were 27.82 mg pot^–1 h^–1 and 8.02 mg pot^–1 h^–1, respectively. However, no CH₄ net emission effects were observed. (ii) Under a constant LED monocolor light intensity (1600 Lux), red, blue, and white light can inhibit N₂O and CO₂ emissions from the rice phyllosphere, resulting in lower emissions than yellow light. White light can also inhibit N₂O and CO₂ emissions from rice roots. (iii) Within the range of 0‒6000 Lux, increases in light intensity can reduce rice phyllosphere CO₂ emissions, but such increases also promote N₂O emissions from the rice phyllosphere and the roots. In contrast, natural sunlight can promote rice phyllosphere N₂O and CO₂ emissions and can inhibit root N₂O emissions. The measure of light control may be the key to low-carbon technology for GHG emission reductions in mature paddy ecosystems.