Management Practices of Miscanthus × giganteus Strongly Influence Soil Properties and N₂O Emissions Over the Long Term

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• 作者：Céline Peyrard ; Fabien Ferchaud ; Bruno Mary ; Eric Gréhan…
• 关键词：N2O ; Miscanthus × giganteus ; Harvest date ; Fertiliser type ; Soil moisture
• 刊名：BioEnergy Research
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：10
• 期：1
• 页码：208-224
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Plant Sciences; Plant Genetics & Genomics; Plant Breeding/Biotechnology; Plant Ecology; Wood Science & Technology;
• 出版者：Springer US
• ISSN：1939-1242
• 卷排序：10

文摘

Cropping practices of Miscanthus × giganteus, a promising energy crop, can influence C and N cycles and therefore potentially affect N₂O emissions. They may vary in harvesting date, either early (EH) or late harvest (LH), and the fertiliser form (NH₄ or NO₃). In this study, we combined a long-term field experiment and simulations with the STICS model to investigate the effect of these practices on soil parameters, N₂O emissions and the contribution of nitrification and denitrification. Daily N₂O fluxes and soil parameters were measured during the 4-month period following fertilisation in 2014 and 2015. Mean cumulative N₂O emissions were markedly higher in LH than EH (4.21 vs. 0.89 kg N₂O–N ha−1 year−1) but did not differ significantly between fertiliser forms or years. The difference was mainly attributed to the higher soil water-filled pore space (WFPS) observed in LH (80 vs. 56 % in EH) which resulted itself from the leaf mulch present in LH and not in EH. WFPS explained 67 % of the variance of N₂O emissions. The large decrease in pH observed after NH₄ fertilisation stimulated N₂O emissions probably through less-efficient reduction of N₂O to N₂ as simulated by STICS. Model outputs suggest a large contribution of nitrification in EH and a dominant contribution of denitrification in LH. Our study highlights the crucial impact of management practises on N₂O emissions in Miscanthus crops through changes in physico-chemical parameters and soil processes on the short and long term and brings knowledge required to maximise the benefits of bioenergy crops.