摘要
为研究沟灌对甘肃盐渍土垄顶与垄沟土壤水盐的影响,在统一起垄、沟灌的基础上,设置3个梯度的灌溉定额:6 600 m^3/hm^2(T1)、7 200 m^3/hm^2(T2)、7800 m^3/hm^2(T3)。通过田间定位试验研究不同灌溉定额对盐渍土含水率、含盐量及盐分离子的影响。试验结果表明:沟灌有助于在垄沟内蓄积水分,将沟内表层土壤盐分控制在较低水平,0~60 cm土层垄沟内土壤含水率比垄顶平均高19.6%、土壤含盐量比垄顶平均低21.8%;随灌水定额增加土壤盐分降低明显;虽然T3处理下油葵的产量最高(2.51 t/hm^2),但T2处理下油葵的水分生产率最高(16.22 kg/m^3)。试验区地处我国西北干旱区,农业水资源有限,灌水量过多不利于提高水分生产率还会增加发生次生盐渍化的风险,因此,沟灌灌溉定额为7 200 m^3/hm^2适宜于改良该地区盐渍土。
In order to study the effect of furrow irrigation on soil water and salt in ridge and furrow of saline soil in Gansu province,three gradient irrigation quotas were set on the basis of unified furrow and furrow irrigation:6 600 m^3/hm^2(T1),7 200 m^3/hm^2(T2),and 7 800 m^3/hm^2(T3).The effects of irrigation quota on water content,salt content and salt ion in saline soil were studied by field location test.The results showed that:furrow irrigation was helpful to store water in furrows and to control soil salt in furrows at a lower level;the soil moisture content in furrows in 0~60 cm soil layer was 19.6%higher than that in ridge tops,and the soil salt content was 21.8%lower than that in ridge tops;soil salinity decreased significantly with the increase of irrigation water quota;although the highest yield(2.51 t/hm^2)was obtained under T3 treatment,the highest moisture productivity(16.22 kg/m^3)was obtained under T2 treatment.The experimental area is located in the arid region of northwest China where agricultural water resources are limited.Too much irrigation water is not conducive to improving water productivity and will increase the risk of secondary salinization.Therefore,ditch irrigation quota of 7 200 m^3/hm^2 is suitable for improving saline soil in this area.
作者
斯庆高娃
Si qing gao wa(Hydraulic and Civil Engineering Department,Inner Mongolia Technical College of Mechanics and Electrics,Hohhot 010070)
出处
《节水灌溉》
北大核心
2019年第10期26-30,共5页
Water Saving Irrigation
基金
内蒙古高等教育科学“十三五”规划课题(NZJGH2016211)
关键词
沟灌
起垄
含水率
含盐量
产量
furrow irrigation
ridging
moisture content
salinity
yield
