Hydrogen Isotope Fractionation in Plant Tissues
Hydrogen Isotope Fractionation in Plant Tissues
复制标题
植物组织中的氢同位素分馏
DOI：
10.1007/978-1-4612-3498-2_8
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发表时间：
1989
影响因子：
5
通讯作者：
H. Ziegler
中科院分区：
文献类型：
--
作者：
H. Ziegler
自养植物(以水为氢源)有机物质中的氚的基本来源是中间水，而在陆生植物中，这意味着土壤水。通常情况下，这种土壤水中的氚含量主要取决于其在降水中的浓度。与水蒸气相比，来自水蒸气的冷凝液在氢中浓缩，结果是，当空气中的水分被去除时，剩余的水蒸气将越来越耗尽在氢中。由于大气中的绝对水分含量与温度有关，降水中氢的消耗增加将导致温度下降。这被称为“气候效应”(参看Schiegl 1970)。由冷凝和蒸发引起的天然水中的氢含量相对于海洋中的氢含量的变化在+100%到-400%之间[标准平均海水(SMOW)]。
The basic source for the deuterium in the organic material of an autotrophic plant (using water as a hydrogen source) is the medium water, and in terrestrial plants this means the soil water. The deuterium content of this soil water again depends normally mainly on its concentration in precipitation. Condensate from the water vapor is enriched in deuterium relative to the vapor with the result that the remaining vapor will be increasingly depleted in deuterium as moisture is removed from the air. Since the absolute water content of the atmosphere is temperature dependent, an increasing depletion of deuterium in precipitation will result in decreasing temperature. This is termed the “climatic effect” (cf. Schiegl 1970). The variations in deuterium content of natural waters caused by condensation and evaporation lie between +100% and -400% with respect to the deuterium content of the ocean [standard mean ocean water (SMOW)].