微型蒸发器测定土面蒸发的试验研究

Study on soil evaporation by using micro-lysimeter

本文通过对比不同微型蒸发器(Micro lysimeters,简称MLS)对测定土面蒸发的试验,以5cm长的MLS每天更换土体作为对照,发现15cm是比较理想的最短长度。同时,对影响土壤蒸发的外界因素进行了分析。结果显示,气象因素中相对湿度、饱和水气压差和辐射同土壤蒸发有着密切的关系,在P=0 05水平下均达到显著水平。此外,表层土壤含水量也是一个重要影响因素。

The optimal dimension of the micro-lysimeter for measuring the evaporation of soil is experimentally studied.It is found that the micro-lysimeter with depth of 15cm is the most suitable dimension for effective measuring of evaporation.The study on factors effecting the evaporation of soil shows that the relative moisture,vapor pressure difference and radiation are major factors.Besides,the moisture of surface soil is also an important factor.