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首页> 外文期刊>Geochemical Journal >Distribution and isotopic composition of n-alkanes from grass, reedand tree leaves along a latitudinal gradient in China
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Distribution and isotopic composition of n-alkanes from grass, reedand tree leaves along a latitudinal gradient in China

机译：中国草，芦苇和树叶中正构烷烃在纬度梯度上的分布和同位素组成

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摘要

Molecular composition and compound-specific carbon and hydrogen stable isotope ratios of n-alkanes are presented for leaves of grass, reeds and trees from five regions extending between latitudes 22° and 39°, China. The distribution of n-alkanes ranges from C_(15) to C_(35) with a high odd over even predominance and carbon-number maxima at C_(27), C_(29) or C_(31). The carbon preference index (CPI) values are from 3.49 to 17.25, with mean values increasing following tree leaf > reed > grass. The average chain length (ACL) values are between 26.24 and 30.26 and the mean values increase following grass > reed > tree leaf. It is observed that Cmax, CPI and ACL values of n-alkanes in plants from low latitudes are higher than those from high latitudes. The δ~(13)C values of C_(27) and C_(29) n-alkanes in plants range from –25.3 to –35.5%o and the grass has a lighter mean carbon isotopic composition than the reed and tree leaf. The δD values of C_(27)and C_(29) n-alkanes in the plants are between –132.1 and –192.6%0 and the mean hydrogen isotopic compositions of C_(27) and C_(29) n-alkanes in the grass are lighter than those in the reed and tree leaves. C_(27) and C_(29) n-alkanes in the grass and tree leaves from high-latitude and elevation area have relatively lighter hydrogen isotopic composition, indicating that these δD values can be used as excellent indicators of environment and climate.
机译：给出了中国22°至39°之间五个地区的草叶，芦苇和树木的正构烷烃的分子组成和化合物特定的碳氢稳定同位素比。正构烷烃的分布范围从C_（15）到C_（35），偶数优势的奇数高，C_（27），C_（29）或C_（31）的碳数最大值。碳偏好指数（CPI）值在3.49至17.25之间，其平均值随树叶>芦苇>草而增加。平均链长（ACL）值在26.24和30.26之间，并且平均值随着草>芦苇>树叶的增加而增加。观察到低纬度植物中正构烷烃的Cmax，CPI和ACL值高于高纬度植物。植物中C_（27）和C_（29）正构烷烃的δ〜（13）C值在–25.3至–35.5％o之间，并且草的平均碳同位素组成比芦苇和树叶轻。植物中C_（27）和C_（29）正构烷烃的δD值在–132.1至–192.6％0之间，草中C_（27）和C_（29）正构烷烃的平均氢同位素组成比芦苇和树叶轻。高纬度和高海拔地区草和树叶中的C_（27）和C_（29）正构烷烃的氢同位素组成相对较轻，表明这些δD值可以用作环境和气候的极佳指标。

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