森林土壤施肥工作在我们国家开始得比较晚，目前在苗圃施肥进行得较普遍。在进行苗木施肥、营养诊断等工作中，首先要弄清林木所需营养元素的性质，包括钾肥在土壤中的性质。由于

42

K半衰期太短，不能用来示踪K，因此我们用

86

Rb替代

42

K进行放射性示踪测定。

This paper describes the distribution and movement of rubidium in cinnamonic soil field of poplar plantation

using

86

Rb as a tagging atom.

To determine the pattern of distribution and movement in question

a number of monolithic soil samples were taken from the field and analysed

by radioactivity measurement and radioactive autography. The results obtained indicated that the maximum movement of

86

Rb in the above-mention soil occured at depths ranging from 6 cm to 15 cm

and that a large amount (83.78~98.73%) of this element was fixed in the upper layer of the soil

to a depth of 3 cm from ground level. Nevertheless

in cinnamonic soil of poplar plantation the movement of

86

Rb had nothing to do with irrigation norm.