Effects of Longterm Amendment of Residue on Denitrification Characteristics and N2O Emissions in Greenhouse Soil

doi:10.3969/j.issn.1000-6362.2014.06.004

Abstract

Abstract: Based on a long term greenhouse experiment（Feb.2004-Sep.2010），the objective of the present study was to find out the effects of wheat residue（high C/N）amendment on denitrification process and N2O emissions in greenhouse soil，by carrying out simultaneous laboratory and field studies，which used methods of static blackchamber and silicone tube in situ to monitor N2O emissions and N2O concentrations in soil profile，respectively.The results showed that，firstly，compared to the control（CK），strawamended treatment（ST）significantly enhanced the denitrification rates and the production of N2 in 0-20cm soil layer，promoted N2O reduction and reduced N2O emissions and N2O concentrations at the depths of 50cm，but had no impact on denitrification characteristics in 20-80cm soil layers.Secondly，residue amendments could reduce the risk of NO-3 leaching in greenhouses.Residue incorporated into deeper soil layers may be a possible effective way to further reduce the risk of NO-3 leaching and to promote followed N2O reduction.Therefore，deep application of wheat residue could decrease N2O emission and NO-3 leaching in greenhouses.

Key words: Trace gases, Nitrogen loss, Solar greenhouse, C/N ratio

SONG He，WANG Cheng Yu，CHEN Qing，CAO Wen chao，WANG Jing guo. Effects of Longterm Amendment of Residue on Denitrification Characteristics and N2O Emissions in Greenhouse Soil[J]. Chinese Journal of Agrometeorology, 2014, 35(06): 628-634.

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