五味子稳定碳同位素分布特征及其与环境因子的关系

Distribution characteristics of stable carbon isotope of Schisandra chinensis (Turcz.) Baill.in relation to environmental factors

利用稳定碳同位素技术分析了辽宁省五味子果实、果梗、叶片稳定碳同位素组成(δ13C)随生长时间的变化规律及果实δ13C值与环境因子之间的关系。结果表明:植物不同器官δ13C值差异显著(P<0.01),表现为果实(-26.356‰)>果梗(-26.620‰)>叶片(-28.327‰),说明光合产物由光合作用器官到非光合作用器官存在明显的碳同位素分馏,非光合作用器官之间也存在差异。随着时间变化,五味子果实δ13C值相对稳定,果梗δ13C值降低,叶片δ13C值显著降低(P<0.001)。五味子果实δ13C值随纬度的升高略有升高(R=0.101),与大气δ13C值呈弱负相关(R=-0.204)。果实δ13C值随纬度的变化为利用同位素技术进行五味子产地鉴别提供了理论依据。

By using stable carbon isotope analysis technique,the distribution characteristics of stable carbon isotope composition （δ13C values） in the fruit,peduncle,and leaf of Schisandra chinensis from Liaoning Province were studied,and the correlations between fruit δ13C value and environmental factors were analyzed. It was found that the organ-specific difference in δ13C values was highly significant （P0.01）,with the sequence of fruit （-26.356‰±0.377‰） peduncle （-26.620‰±0.342‰） leaf （-28.327‰±0.370‰）,which suggested that there was a distinct post-photosynthetic δ13C fractionation between photosynthetic and non-photosynthetic organs. During the growth period of S. chinensis,the δ13C value of fruit remained relatively stable,that of peduncle decreased,and that of leaf decreased significantly （P0.001）. The δ13C value of fruit had a slight increase with increasing latitude,and had an insignificant negative relationship with atmospheric CO2. The variation of fruit δ13C value with latitude could be used as an indicator to distinguish different origins of S. chinensis.