Effect of Soil Moisture on Leaf Transpiration

Effect of Soil Moisture on Leaf Transpiration

Most of the water absorbed by the leaves comes from the soil. Therefore, the amount of soil moisture has a certain influence on the transpiration of the leaves. We used some studies to analyze the effects of soil moisture on leaf transpiration. During the experiment, we used the wireless moisture and drought management system to monitor the changes in soil moisture. The Wireless Public Opinion and Drought Management System applies the latest public opinion monitoring specification SL000-2005, which enables simultaneous six-point monitoring of 60 points. Wireless public opinion and drought management systems are sometimes referred to as wireless public opinion monitoring systems. They are currently used by agriculture, forestry, environmental protection, water conservancy, and meteorology departments. They are often used in soil moisture remote telemetry surveys, water-saving irrigation, greenhouse control, and precision agriculture. Other uses. Through the detection of soil moisture, our agriculture has become more scientific and technological.

The effect of soil moisture on leaf transpiration was as follows: By measuring the transpiration rate of leaves under different soil moisture conditions, we know that when the relative humidity of the soil is small, the transpiration rate of the leaves is significantly smaller, and the transpiration rate increases with the increase of the relative humidity of the soil. Gradually increasing, the transpiration rate reaches a maximum when the relative humidity of the soil is close to saturation (field capacity). Figure 1 shows that when the soil relative humidity is about 38% and 46%, the maximum transpiration rate appears at 15:00; when the soil relative humidity is 62%, the maximum transpiration rate occurs at 14:00; the relative soil The maximum transpiration rate occurs at 13:00 when the humidity is at 82%, and at 17:00 when the soil relative humidity reaches 100%.

The effect of soil relative humidity on the transpiration of winter wheat was extremely significant. At 9:00, the transpiration rates of soil water treatments did not differ significantly. When the soil relative humidity was between 38% and 62%, the transpiration rate was higher at 46% in different periods, lowest at 62%, and highest at 82%. At the same time, with the exception of 9:00 hours (the solar radiation is relatively weak), the curves in other periods have obvious double peak characteristics. At other times, when the relative humidity of the soil reaches 62% or so, the transpiration rate is lower than other relative humidity. Significantly small. According to the analysis, under this soil moisture condition, the transpiration rate is the most sensitive to changes in external environmental conditions.