不同垄作根域限制栽培方式对滴灌土壤水盐运移的影响

Movement of Soil Water and Salt of Drip Irrigation Under Different Ridge Cultivation Methods With Root Domain Restrictions

以二年生“宁杞7号”为试材,研究不同垄作根域限制栽培方式下滴灌土壤水盐运移规律,探索滴灌条件下垄作根域限制盐分的灌溉调控方法,以期为宁夏干旱盐碱地种植枸杞等作物提供参考依据。结果表明:当累计灌水量达到1715.7m^(3)·hm^(-2),可有效将处理全沙垄、1/2原土+1/2沙垄、2/3原土+1/3沙垄垄体全盐含量降至轻度盐化土和非盐化土范围,利于枸杞生长;对比各处理垄体盐含量下降速率,掺沙土根限垄作处理全沙垄、1/2原土+1/2沙垄、2/3原土+1/3沙垄有利于盐含量下降;对比各处理苗木成活率,根限垄作栽培模式枸杞苗成活率高于对照,且掺沙土根限垄作处理苗木成活率最高,分别为96.3%、93.1%、100.0%,三者差异不明显。综上所述,对于重度盐化地,可采用“滴灌+掺沙土+垄作根域限制”水盐调控模式进行枸杞种植,应保证在滴灌强化淋洗灌水1715.7m^(3)·hm^(-2)以上,方可进行垄体枸杞栽植。

Two-year-old‘Ningqi No.7’was used as experiment material,movement of soil water and salt of drip irrigation under different ridge cultivation methods with root domain restrictions was researched in order to explore the ridge cultivation methods with root domain restrictions under drip irrigation.In order to provide a reference for planting Lycium barbarum in arid saline alkali land of Ningxia.The results showed that when the cumulative irrigation amount reached 1715.7m^(3)·hm^(-2),the total salt content of the whole sand ridge,1/2original soil+1/2sand ridge,2/3original soil+1/3 sand ridge could be effectively reduced to the range of mild saline-alkaline soil and non-salinized soil,which was beneficial to the growth of Lycium barbarum.Compared with the rate of decrease in ridge salinity,the treatment of full sand ridge,1/2original soil+1/2sand ridge,2/3original soil+1/3sand ridge with sandy soil root-limiting ridge was beneficial to salt contemt reduction;comparing the survival rate of seedlings,the survival rate of Lycium barbarumin the root-limit ridge cultivation mode was higher than CK,and the survival rate of the plants in the root-limit ridge cultivation mixed with sandy soil was the highest,96.3%,93.1%,and 100.0%,respectively.There was no significant difference between the three.Conclusion based on the severe saline alkali soil,which the water and salt regulation mode of‘drip irrigation+guest sand soil+ridge root restriction’could be used for Lycium barbarumplanting,and the ridge Lycium barbarum planting can be carried out only when the drip irrigation and enhanced leaching irrigation are more than 1715.7m^(3)·hm^(-2).