不同氮素形态配比对烤后烟叶主要挥发性香气物质含量的影响

氮素形态配比试验表明:不同部位间,烤后烟叶新植二烯、芳香族氨基酸代谢产物、美拉德反应产物、西柏烷类降解产物及挥发性香气物质总量的变异均达到极显著水平.处理间,除类胡萝卜素降解产物外,其他烤后烟叶香气物质的变异均达到极显著水平.不同氮素形态配比相比较,随着硝态氮施用比例的提高,烤后烟叶不同部位各类香气物质含量和挥发性香气物质总量呈上升趋势,其中以70%硝态氮 30%铵态氮处理的效果最为明显.在定氮(75 kg/hm~2)条件下,不同硝态氮比例与挥发性香气物质间均存在不同程度的正相关关系.对下部叶,硝态氮比例与美拉德反应产物的相关系数达到了极显著水平;对中部叶,硝态氮比例与新植二烯及挥发性香气物质总量的相关系数均达到极显著水平,与美拉德反应产物及西柏烷类降解产物的相关系数也均达到显著水平;对上部叶硝态氮比例与美拉德反应产物及西柏烷类降解产物的相关系数均达到极显著水平,与芳香族氨基酸代谢产物的相关系数也达到显著水平.总之.在氮用量相同的条件下,适当地增加硝态氮比例有助于挥发性香气物质含量的提高.

Effects of different nitrogen forms on content of the main volatile aroma components of flue-cured tobacco

The experiment of different nitrogen forms showed that:There existed highly significant differ- ence for content of neoplytadiene,products of aromatic amino acid metabolism,products of Maillard reac- tion,products degraded by cembrane and total content of volatile aroma components among different posi- tions.The variation of main volatile aroma components was significant at 0.01 level except the products de- graded by carotenoid among the different treatments.As to treatments of different nitrogen forms,all kinds of content of aromatic matters and total content of volatile aroma components showed an increasing trend with increasing of nitrate nitrogen proportion among different positions,and the treatment of 70% nitrate ni- trogen 30% ammonia nitrogen was the best.Under the condition of treatment of 75 kg/hm~2,the correla- tion between different nitrate nitrogen proportion and content of volatile aroma matters was positive with dif- ferent degrees.For lugs,it was significant at 0.01 level for the correlation between different nitrate nitro- gen proportion and content of products of Maillard reaction.For cutters,correlation coefficients of different nitrate nitrogen proportion were significant at 0.01 level with content of neoplytadiene,and total content of volatile aroma components,and significant at 0.05 level with content of products of Maillard reaction,and products degraded by cembrane,respectively.For upper leaves,correlation coefficients between different nitrate nitrogen proportion and content of products of Maillard reaction,and products degraded by cem- brane were significant at 0.01 level;correlation coefficients between the different nitrate nitrogen propor- tion and content of products of aromatic amino acid metabolism were also significant at 0.05 level.There- fore,under the condition of treatment of 75 kg/hm~2,the total content of volatile aroma components could be increased by adding nitrate nitrogen fertilizer to some extent.