棉花膜下滴灌墒情监测点的定位

结合田间观测,研究了棉花膜下滴灌墒情监测点的定位问题。试验于2009年6月至9月在新疆库尔勒市包头湖农场进行,试验区采取1膜1带4行棉花的种植形式,距滴灌带0、20、45、70 cm处布置4根TDR观测管,采用TDR观测0~100 cm深度土壤剖面水分分布。结果表明,滴头处的监测点与距滴灌带20、45 cm处的土壤含水率垂直分布无显著性差异,与距滴灌带70 cm处的土壤含水率垂直分布有显著性差异。因此,墒情监测点布置于距滴灌带0、20、45 cm处均可,不宜布置在更远处。

Layout of Soil Moisture Monitoring Points for Cotton Mulched Drip Irrigation

Due to the uneven distribution of soil moisture along emitters,the layout of soil moisture observation points has become a key issue in soil moisture monitoring.An experiment was conducted in Baotouhu Farm,Korla Xinjiang,from June to September 2009.Cotton was planted in a 1-membrane-1-belt-and-4-line cotton pattern.4 TDR probes were installed at distances of 0,20,45 cm and 70 cm to the belt to monitoring soil moisture distribution.The result indicated that no significant difference between the soil moisture vertical distribution at emitter and 20 cm,45 cm away was detected;while there was significant difference between the soil moisture vertical distribution at emitter and 70 cm away.Therefore the soil moisture observation points can be deployed at 0 cm,20 cm or 45 cm from the belt and should not be deployed in a more distant.