摘要
通过对相同规格的滴灌带在不同土壤含水量、不同滴灌方式和不同灌水量条件下灌水,研究水分在土壤中的下渗分布规律。结果表明,单管滴灌条件下,水分在不同含水量土壤中湿润体均呈坛状;双管滴灌条件下,水分在不同含水量土壤中湿润体依灌水量大小而异,灌水量较小时呈并放双碗状,随灌水量增大,湿润体逐渐呈坛状。不同滴灌方式下灌水,满足植物根系需要的灌水量不同,单双管滴灌灌水量分别为300 m3/hm2和450 m3/hm2时即可满足植物根系对水分的需求。单双滴在相同灌水量条件下,土壤表层湿润半径大小变化因土壤含水量不同而不同,土壤垂直湿润深度随灌水量增大而增加;在相同灌水量条件下,滴灌方式和初始土壤含水量对土壤水分湿润圈大小有很大影响。
The infiltration and distribution rules of soil water are studied through irrigation experiment with the same drip irrigation hose under different soil moisture,different drip irrigation ways and different total irrigation quantity.The results show that under the condition of single-tube drip irrigation,all the wetted volume of water in different moisture soils show Tan-shape.While under double-tubes drip irrigation condition,the wetted volume size varies along with the total irrigation quantity.When the total irrigation quantity is low,the wetted volume shows double-bowl.With the increase of the total irrigation quantity,the wetted volume gradually becomes Tan-shape.Under different drip irrigation ways,the irrigation quantity to suffice the requirement of plant root is different,which is 300 m3/hm2 and 450 m3/hm2 under single-tube and double-tubes drip irrigation,respectively.Under the same irrigation quantity condition,the soil surface wetted radius varies along with the soil moisture.The vertical wetted depth increases with the increase of irrigation water quantity.And the drip irrigation ways and initial soil moisture greatly affect the wetted radius.
出处
《节水灌溉》
北大核心
2010年第7期6-9,13,共5页
Water Saving Irrigation
基金
国家科技支撑计划项目(2007BAD88B07-1)
关键词
滴灌
水分分布
运移
drip irrigation
water distribution
movement
