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首页> 外文期刊>Soil Biology & Biochemistry >Theoretical model of the abiotic component of soil super(13)CO sub(2) tracer efflux in super(13)C pulse-labeling experiments on plant-soil systems
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Theoretical model of the abiotic component of soil super(13)CO sub(2) tracer efflux in super(13)C pulse-labeling experiments on plant-soil systems

机译：植物（土壤）中超（13）C脉冲标记实验中土壤超（13）CO亚（2）示踪剂外流非生物成分的理论模型

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摘要

For measurement of the time lag between photosynthesis and CO sub(2) efflux from soil, the carbon isotope pulse-labeling technique is considered as the most suitable. However, an interference from the abiotic tracer CO sub(2) component is identified as a key difficulty for obtaining accurate results with this technique. Guidelines on how to reduce this interference are therefore urgently needed. The flux of abiotic super(13)CO sub(2) tracer into soil during the labeling stage, and its return to atmosphere during the monitoring stage was modeled numerically, and the labeling stage also analytically. The controls of the abiotic interference were investigated using these models. The amount of the abiotic tracer component and the time distribution of its rate of return to the atmosphere, were predicted by these models. The main model parameters were D sub(m)(=the ratio between the soil super(13)CO sub(2) diffusivity and the retardation factor), and the super(13)CO sub(2) concentration at the soil-atmosphere interface during the labeling stage (S sub(13)), while background super(13)CO sub(2) soil production parameters were unnecessary. The presented models guide the selection of experimental parameters for minimization of the abiotic interference. With parameterization for a particular case, the present numerical model provides a preliminary order-of-magnitude estimate of the abiotic component, which would indicate if this interference is of significance.
机译：为了测量光合作用和土壤中CO sub（2）外排之间的时间差，碳同位素脉冲标记技术被认为是最合适的。但是，来自非生物示踪剂CO sub（2）组件的干扰被确定为使用此技术获得准确结果的关键困难。因此，迫切需要有关如何减少这种干扰的指南。非生物超级（13）CO sub（2）示踪剂在贴标阶段向土壤的通量，以及在监测阶段返回大气的过程均经过数值模拟，贴标阶段也进行了分析。使用这些模型研究了非生物干扰的对照。这些模型预测了非生物示踪剂组分的量及其返回大气的速率的时间分布。主要模型参数为D sub（m）（=土壤super（13）CO sub（2）扩散系数与延迟因子之比），以及土壤大气中super（13）CO sub（2）浓度。贴标阶段（S sub（13））的界面，而不需要背景super（13）CO sub（2）的土壤生产参数。提出的模型指导选择实验参数以最小化非生物干扰。通过针对特定情况进行参数化，本数值模型可以提供非生物成分的初步数量级估计，这将表明这种干扰是否很重要。

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