不同配置滴灌棉田土壤水分变化研究

目的]合理地布置土壤墒情监测点,获取真实的农田土壤水分信息。方法]对2种不同配置的膜下滴灌棉田土壤水分含量进行测定,根据灌溉后不同取样时间、不同空间采样位置研究农田土壤水分变化。结果]2种配置下滴灌带正下方土壤水分含量最大,距离滴灌带靠近膜间位置40 cm（2管4行）、60 cm（2管6行）土壤水分含量最小,各深层土壤20 cm表层土壤水分含量变异最大（CV=0.21）,60 cm土壤水分含量变异最小（CV=0.16）;2种配置在距离滴水时间120 h,土壤深层20-40、40-60 cm处土壤水分含量差异最为显著。结论]对于土壤水分含量的测定需要综合考虑配置、测定时期和测定位置,才能够正确反映棉田土壤水分含量变化。

Research on the Moisture Change of Cotton Field under the Different Dripping Irrigation

Objective] The real information on the moisture in soil was obtained through the reasonable arrangement of monitoring site.Method] The content of water in cotton field,which irrigation was dripped with 2 different installations,was measured and the change of the moisture in field was researched according to the different sampling times and spatial locations after irrigation.Results] In two kinds of treatments,the maximum content of moisture was in the place directly below dripping point and the minimum,in the place of 40 cm(2 tube in 4 lines) and 60 cm(2 tube in 6 line) from the dripping tape.The maximum variation of the content of surface water(CV=0.21) was in the place of 20 cm from the dripping tape and the minimum(CV=0.16),60 cm from the dripping tape.There was the most significant difference in the variation of the content of water at the place of 20-40 cm and 40-60 cm from the dripping tape in two treatments while the interval time of its dripping was 120 hours.Conclusion] The dripping installation,testing time and location must comprehensively be considered in the determination of moisture in soil,which could be able to correctly reflect the change in moisture in cotton field.