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在土壤水分张力计系统内嵌入一电子式温度传感器,对管内温度进行实时监测,对照管内压力发现:以密封塞取代陶土头时,管内温度上升26.9℃内压力变化了14.6Kpa。当实验盆钵内的土壤含水量相对不变时,负压计中的压力值仍然随着温度变化出现有规律的周期变动,温度上升22.2℃管内压力变化了7.4 Kpa。通过对采集管内张力数据进行补偿运算,对张力计系统的升温和降温阶段进行温度补偿,可有效对由温度变化引起的张力计系统误差进行校正。当测定间隔为4h、温差为18.1℃时,两点的张力相差仅0.278Kpa,未做补偿的两点压力差达6.5 Kpa。说明在在土壤水分张力计系统内嵌入一电子式温度传感器能够有效校正温度变化引起的张力计系统误差,达到全天候实时对目标地区实现水分管理的目的。
An electronic temperature sensor was embedded in the soil moisture tensiometer system to monitor the temperature in the pipe in real time. According to the pressure in the pipe, it was found that the pressure in the pipe rose by 14.6Kpa when the temperature in the pipe rose by 26.9 ℃ when the pottery was replaced by the sealing plug. When the soil moisture content in the experimental bowl is relatively constant, the pressure in the negative pressure gauge changes regularly with the temperature, and the pressure in the tube changes by 7.4 Kpa when the temperature rises by 22.2 ℃. By compensating the tension data in the collecting tube, the temperature compensation for the heating and cooling phases of the tension gauge system can effectively correct the error of the tension gauge system caused by the temperature change. When the measurement interval is 4h and the temperature difference is 18.1 ℃, the tension difference between the two points is only 0.278Kpa. The pressure difference between two points without compensation reaches 6.5Kpa. It is indicated that the system error can be effectively corrected by embedding an electronic temperature sensor in the soil moisture tensiometer system to achieve the purpose of real-time moisture management in the target area on an all-weather basis.