THE USE OF MEAN POOL ABUNDANCES TO INTERPRET N-15 TRACER EXPERIMENTS .1. THEORY
THE USE OF MEAN POOL ABUNDANCES TO INTERPRET N-15 TRACER EXPERIMENTS .1. THEORY
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DOI：
10.1007/bf00010423
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发表时间：
1991-02-01
期刊：
影响因子：
4.9
通讯作者：
BARRACLOUGH, D
中科院分区：
文献类型：
--
作者：
BARRACLOUGH, D
详细介绍了一个简单的数学框架，该框架允许根据土壤/植物氮循环的主要过程来解释N-15示踪实验。所有这些计算都可以在科学计算器上进行，得出总矿化和硝化速率以及以氨和硝酸盐形式出现的作物氮素吸收。介绍了两种方法。一种是将标记的铵和无标记的硝酸盐作为一种处理，将无标记的铵和标记的硝酸盐作为另一种处理进行配对实验。第二个程序只需要标记的铵，无标记的硝酸盐处理。用实际实验数据进行了实例计算。解释程序使用了这样一个事实，即标记为N-15的铵的同位素稀释速率是未标记的铵通过矿化引入该库的速率的函数。同样，N-15标记硝酸盐池中的同位素稀释率是通过硝化作用将未标记硝酸盐引入池中的速率的函数。
Details are presented of a simple mathematical framework that allows N-15 tracer experiments to be interpreted in terms of the main processes of the soil/plant nitrogen cycle. The calculations, all of which can be performed on a scientific calculator, yield the rates of gross mineralization and nitrification and the crop nitrogen uptake occurring as ammonium and nitrate. Two procedures are presented. One requires paired experiments with labelled ammonium and unlabelled nitrate as one treatment, and unlabelled ammonium and labelled nitrate as the other. The second procedure requires only the labelled ammonium, unlabelled nitrate treatment. Example calculations are presented using actual experimental data.The interpretative procedure uses the fact that the rate of isotopic dilution in an ammonium pool labelled with N-15 is a function of the rate at which unlabelled ammonium is introduced into the pool via mineralization. Similarly, the rate of isotope dilution in an N-15 labelled nitrate pool is a function of the rate at which unlabelled nitrate is introduced into the pool via nitrification.