摘要
在番茄生长过程中施加不同种类氮肥,并在固定时间取土壤、肥料、植株及果实样品,通过上述样品的氮稳定同位素比率特征研究氮肥种类对番茄δ15N值的影响。结果表明,氮肥种类对番茄果实δ15N值具有显著影响,施入化学氮肥的番茄果实中δ15N值会显著低于未施化学氮肥的番茄果实;相同氮肥条件下,时间因素对番茄δ15N值差异影响不显著;番茄植株(叶和茎)的δ15N值始终大于同株果实的δ15N值,与时间和氮肥种类无关;同时,植物样品的δ15N值一般高于土壤或肥料的δ15N值。植物δ15N值可以作为判断蔬菜在种植过程中是否施入化肥的指标,为区分有机和常规蔬菜提供理论和技术支持。
To investigate the effect of different kinds of fertilizer on the δ15N value of vegetable,tomatoes were planted with different nitrogen fertilizers in the winter of 2011 and summer of 2012.The δ15N values of plants,fruits,soils and fertilizers were analyzed.Results showed that the difference of δ15N values among the samples with the same fertilization was not significance in different years.The δ15N values in leaves and stems were always higher than in fruits.This study demonstrated that the δ15N value can be an important indicator to trace the chemical nitrogen fertilizers applied during the stage of growth.This provides theoretical and technological supports to distinguish between organic and conventional vegetable.
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2013年第1期108-111,共4页
Food and Fermentation Industries
基金
科技部国际合作项目(2011DFA33270)资助
国家自然科学基金(311101333)资助
