核农学报2017，Vol.31Issue(8)：1576-1584,9.DOI:10.11869/j.issn.100-8551.2017.08.1576
紫云英还田对单季稻田氨挥发的影响
Effects of Chinese Milk Vetch on Ammonia Volatilization From Single Season Rice Fields in South China
摘要
Abstract
The NH3 volatilization of N nutrient in the single season rice cropping ecosystem was worth to be investigated to provide a theoretical evidence on the legume green manure mitigating the environmental risks related to N losses and improve N efficiency in the Chinese milk vetch-single season rice cropping system of South China.A pot experiment which included 3 treatments [without N nutrient (CK),solely nitrogen fertilization (N),combined nitrogen fertilizer with Chinese milk vetch (NM)],was carried out to study the effects of Chinese milk vetch on the ammonia volatilization from paddy field in mono-rice based cropping system of South China.The fluxes of ammonia volatilization peaked on the third day after fertilization either applied urea solely or integrated with Chinese milk vetch residues (10.8 kg·hm-2· d-1 and 9.27 kg·hm-2 ·d-1 respectively),and then decreased rapidly.During the monitoring period,the cumulative amount of NH3 volatilization was 93.4 kg·hm-2 and 79.8 kg·hm-2,accounting for 25.7％ and 21.9％ of total nitrogen respectively.Furthermore,the NH3 volatilization rate and its cumulative amounts were significant positive linear correlated with the NH4 + content and pH value as well as the activities of hydroxylamine reductase of paddy soil at tillering stage of rice plants.Compared with N treatment,the NM treatment remarkably decreased the ammonium nitrogen content and pH value of surface soil water,as well as reduced the activities of hydroxylamine reductase of paddy soil at tillering stage of rice plants by 37.8％.Thus the volatilization of NH3 from soil was suppressed.NH3 volatile cumulates and volatile coefficient significantly decreased by 14.6％ and 14.8％,respectively.In summary,applying Chinese milk vetch with urea to paddy field in South China had a significant effect on improving the nitrogen use efficiency as well as decreasing NH3volatilization from paddy fields and the related environmental risks in single season rice-based cropping system,which will provide a theoretical basis for mitigating the gas loss and improving the utilizing efficiency of nitrogen fertilizer in the single rice based cropping systems.关键词
紫云英/单季稻/氮素/NH3挥发/羟胺还原酶Key words
Chinese milk vetch/single season rice/nitrogen nutrient/NH3 volatilization/hydroxylamine reductase引用本文复制引用
谢志坚,涂书新,徐昌旭,刘光荣..紫云英还田对单季稻田氨挥发的影响[J].核农学报,2017,31(8):1576-1584,9.基金项目
江西省农业科学院创新(博士)基金(20162CBS010),国家公益性行业(农业)科研专项(201103005、201503123),“十二五”国家科技支撑计划(2012BAD15B00) （博士）
