华北平原典型区域土壤凝结水观测及其影响因素研究

为查明华北平原典型区凝结水发生情况,采用称重法进行了土壤凝结水的初步观测,结果显示:每日14时至次日10时均可观测到凝结水的生成,研究区凝结水大部分来自于大气中的水分,极小部分来源于下层土壤,其主要凝结集中在表层0～5cm范围内,共占观测深度总凝结水量的50%左右。根据土壤凝结水形成的影响因素分析结果,较低的温度、较高的相对湿度和无风的条件有利于凝结水的生成。

Observation on Soil Condensation Water and Its Impact Factors in Typical Region of North China Plain

In order to ascertain the production of soil condensation water in the typical region of North China Plain, the weighing method was used to observe soil condensation water in the study area. The results indicated that the formation of soil condensation water can be observed from 2:00 pm to 10:00 am of the next day. Most of soil condensation water originated from the air vapor and only a small amount from soil water, of which about 50% of the total condensation water gathered in the range of 0 to 5 cm below the ground surface. According to the analysis results of impact factors for the formation of soil condensation water, high relative humidity, low atmospheric temperature, and low wind speed were favorable for the formation of the soil condensation water.