β射线测量仪常用于测定叶片相对含水量,但刻度问题限止了该技术的实际应用。在实验室和现场已成功地测定了露的厚度和持续时间,并且对该法的相对优缺点已详细地讨论过。测量土壤水分的蒸腾损失在农业上是很重要的。以前的研究表明,β射线测量仪用于农业研究有足够的探测灵敏度。本工作为评价蒸腾测量技术的适用性而进行了一些初步实验。 Beta ray measuring instrument is often used to determine the relative water content of leaves, but the scale problem limits the practical application of the technology. The thickness and duration of the dew have been successfully measured both in the laboratory and in the field, and the relative advantages and disadvantages of the method have been discussed in detail. Measuring transpiration losses of soil moisture is of great agricultural importance. Previous studies have shown that β-ray measuring instruments have sufficient detection sensitivity for agricultural research. This work carried out a few preliminary experiments to evaluate the applicability of transpiration measurement techniques.