滴灌湿润体内土壤墒情监测点位置的试验研究

为了快速精确地监测土壤水分,通过田间试验观测了滴灌带一个湿润体内不同位置的7个中子仪监测点0～120cm深度土壤剖面的水分分布,分析了膜下滴灌湿润体内土壤水分随监测点位置的变化情况。结果表明:土壤含水率的差异,只与监测点与滴灌带的距离有关,距滴头5 cm处的监测点与距滴灌带30 cm处的土壤含水率垂直分布无显著性差异,与距滴灌带55、70 cm处的土壤含水率垂直分布有显著性差异。因此,墒情监测点应布置于距滴灌带0～30 cm范围内,不宜超过此范围。

Study on the Location of Moisture Monitoring in Soil Infiltration Body of Drip Irrigation

In order to make the monitoring accurately and quickly,the water distribution on soil section from 0 to 120 cm depth was monitored through 7 neutron probes installed the different locations in soil infiltration body along drip irrigation tape from the field experiment and analyzed the changes of soil water content of wetted body in different monitoring locations under mulched drip irrigation according to the experimental data.The result indicates that it is depended on the distance between drip irrigation tape and monitoring point whether there are differences of soil water contents.The different of the soil moisture vertical distribution between 5 cm and 30 cm away from drip irrigation tape is not significant.While there is significant difference between the soil moisture vertical distribution at 55 cm and 70cm location.Therefore the soil moisture observation points can be deployed within the range from 0 cm to 30 cm and should not be exceeded the range.