THE STABLE ISOTOPIC COMPOSITION AND MEASUREMENT OF CARBON IN SOIL CO2

被引：118
作者：
DAVIDSON, GR
机构：
[1] University of Arizona, Department of Hydrology and Water Resources, Tucson
来源：
GEOCHIMICA ET COSMOCHIMICA ACTA | 1995年 / 59卷 / 12期
关键词：
D O I：
10.1016/0016-7037(95)00143-3
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The theoretical minimum difference between the delta(13)C of soil CO2 (a concentration) and soil-respired CO2 (a flux) was previously thought to be 4.4 parts per thousand. It is shown here that the difference is a function of the delta(13)C of soil-respired CO2, with possible minimum values less than 4.4%0. A simple equation is given which allows the delta(13)C of soil CO2 or soil-respired CO2 to be calculated from four measurable variables. Sampling methodology is investigated demonstrating the need for correcting measured soil-respired CO2 samples for CO2 contamination in base reagents, for contributions from atmospheric CO2, and for isotopic fraction at ion at the base-solution/air interface.
引用
收藏
页码：2485 / 2489
页数：5
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