不同产地库尔勒香梨果实生育期氢、氧稳定同位素特征

Characteristics of hydrogen and oxygen stable isotopes in different origins Korla fragrant pear fruits in growth period

中文关键词:  库尔勒香梨  稳定同位素  氢  氧  真实性鉴别  生育期

英文关键词:Korla fragrant pear  stable isotope  hydrogen  oxygen  authenticity identification  growth period

中文摘要:

      目的 分析库尔勒香梨果实生育期氢(H)、氧(O)稳定同位素比值及其变化规律, 比较不同产地香梨果实δ2H、δ18O差异。方法 以不同产地库尔勒香梨为研究对象, 采集花后60~150 d的果实样本, 采用真空冷凝提取法抽提果实中的水分, 用高温裂解-同位素比值质谱法测定其δ2H、δ18O值, 分析香梨生育期H、O同位素特征, 通过方差分析法探讨各产地果实水分δ2H、δ18O值的差异。结果 新疆库尔勒市、阿克苏市和甘肃酒泉市的香梨生育期果实水δ2H的变化范围分别为?49.9‰~?15.4‰、?62.0‰~?28.2‰、?61.5‰~1.5‰, δ18O的变化范围分别为?2.5‰~6.7‰、?5.3‰~3.4‰、?3.5‰~14.2‰, 成熟期3个产地δ18O值均存在极显著性差异(P<0.01)。整个生育期3个产地δ2H、δ18O蒸发线均位于当地大气水线右下方, 香梨果实水富集作用明显。结论 新疆库尔勒市、阿克苏市和甘肃酒泉市香梨果实在整个生育期H、O同位素具有各自的指纹特征, 库尔勒的蒸发线斜率和截距更低, 果实水蒸发富集2H、18O的能力更强。

英文摘要:

      Objective To analyze the hydrogen (H) and oxygen (O) stable isotope ratios and their changing laws during the growth period of Korla fragrant pear fruits, and compare the differences in δ2H and δ18O of fragrant pear fruits from different origins. Methods Taking the Korla fragrant pear from different origins as the research object, the fruit samples were collected from 60 to 150 days after flowering, and the water in the fruit was extracted by vacuum condensation extraction method. The δ2H and δ18O values were determined by high temperature isotope-ratio mass spectrometry, and the H and O isotopic characteristics of fragrant pear during the growth period were analyzed, the differences of δ2H and δ18O values of fruit moisture in different producing areas were analyzed by variance analysis method. Results The variation ranges of δ2H in fruit water during the growth period of fragrant pears in Korla, Aksu, and Jiuquan, Gansu were ?49.9‰~?15.4‰, ?62.0‰~?28.2‰, ?61.5‰~1.5‰, the variation ranges of δ18O were ?2.5‰~6.7‰, ?5.3‰~3.4‰, ?3.5‰~14.2‰, and there were extremely significant differences in δ18O values in the 3 production areas in the mature stage (P<0.01). During the whole growth period, the δ2H and δ18O evaporation lines of the 3 production areas were located in the lower right of the local atmospheric water line, and the water enrichment effect of fragrant pear fruit was obvious. Conclusion The H and O isotopes of fragrant pear fruits in Korla, Aksu, and Jiuquan, Gansu have their own fingerprint characteristics. During the whole growth period, the slope and intercept of the evaporation line in Korla wre lower, and the ability of fruit water evaporation to enrich 2H and 18O is stronger.