高粱中氮同位素丰度的测定和应用

Determination and Application of ¹⁵N Abundance in Sorghum

摘要: 为研究不同肥料对高粱中氮稳定同位素丰度的影响，采用稳定同位素质谱法测定高粱中氮同位素比值，并对有机和常规两种农业体系种植的高粱果实进行同位素分析。结果表明：高粱δ¹⁵N值与高粱生长过程中所施的肥料密切相关；施有机肥的高粱δ¹⁵N值普遍高于施化肥的高粱，因此δ¹⁵N值可作为鉴别有机高粱和常规高粱的重要参考要素。该方法可对有机高粱酿造的白酒和其他高粱酿造的白酒进行鉴别和区分，以维护企业和消费者的合法权益。

Abstract: In order to investigate the effects of different kinds of fertilizer on nitrogen isotope composition of sorghum, the plants were cultivated according to organic and conventional agriculture. The method of determining nitrogen stable isotope ratio (δ¹⁵N) of sorghum was established using stable isotope ratio mass spectrometer (IRMS). Nitrogen isotope ratios（δ¹⁵N values）of sorghum fruits were determined. The result shows that the δ¹⁵N values of sorghum are closely related with the kinds of fertilizer applied during the plant’s growth time. The δ¹⁵N values of organic sorghum are often higher than those of conventional ones. The δ¹⁵N values of sorghum can provide a reference for tracking kinds of fertilization applied on sorghum plants.