植物叶蜡氢同位素分馏系数数据集（现代）

本研究调查了我国不同区域（包括青藏高原、新疆、中国东北和中国南方）的陆生植物叶蜡δD组成和对应的源水（降水和土壤水）δD组成，以及控水实验观测的叶蜡δD组成和对应的源水（土壤水和叶片水）δD组成，讨论了高等植物叶蜡氢同位素表观分馏系数的变化特征和主要影响因素。结果表明：陆生植物叶蜡表观分馏系数（εprecipitation）变化范围很大，且随着干旱指数的增大逐渐偏负，结合水生植物和控水实验陆生植物叶蜡氢同位素分馏系数结果，表明高等植物叶蜡氢同位素生物合成分馏系数应该是一个常数，而目前观测到的不稳定的陆生植物叶蜡氢同位素表观分馏系数主要是由于大气降水通过土壤水和叶片水被植物利用的过程中，由于蒸发蒸腾作用强度不同，植物叶蜡合成所利用水的δD值不断变化造成的。

This study investigated the leaf wax δD compositions of terrestrial plants and their corresponding source water (precipitation and soil water) δD compositions across different regions of China, including the Tibetan Plateau, Xinjiang, Northeast China, and Southern China, as well as the leaf wax δD compositions observed in controlled water experiments and their corresponding source water (soil water and leaf water) δD compositions. It also discussed the variation characteristics and main influencing factors of the hydrogen isotope apparent fractionation coefficients of higher plant leaf waxes. The results show that the apparent fractionation coefficients (εprecipitation) of terrestrial plant leaf waxes have a wide range of variation and gradually become more negative with increasing aridity index. Combined with the results of hydrogen isotope fractionation coefficients of aquatic plants and terrestrial plant leaf waxes from controlled water experiments, this indicates that the biosynthetic fractionation coefficients of hydrogen isotopes in higher plant leaf waxes should be a constant value. The currently observed unstable apparent fractionation coefficients of hydrogen isotopes in terrestrial plant leaf waxes are mainly caused by the continuous changes in the δD values of the water used for plant leaf wax synthesis, which result from varying intensities of evapotranspiration during the process where atmospheric precipitation is utilized by plants via soil water and leaf water.