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- Title
次生盐渍土暗管+竖井排水控盐技术模式筛选及效果评价.
- Authors
石磊; 吕宁; 何帅; 尹飞虎; 高志建; 谭荣欣
- Abstract
【Objective】 The aim of this project is to evaluate the salt drainage effect by subsurface pipe and shaft technology on secondary salinized soil in southern Xinjiang and select out the suitable layout spacing of subsurface pipe project.【Methods】 The paper took the secondary salinized soil of the 38th regiment of the second division in Southern Xinjiang as an experimental area, and the field test of water and salt drainage by shaft (vertical drainage) + subsurface pipe (horizontal drainage) was carried out from 2016 to 2019. The 3 adjacent plots were selected and the layout spacing of subsurface pipe was set to 6, 8, 10 m (marked as T1, T2, T3), respectively; the buried depth of subsurface pipe was set to 1.2 m and the depth and spacing of shaft was set to 20 and 120 m in each treatment. 【Results】 The results showed that (1) the soil salinity significantly decreased after 2 years salt drainage and the soil electrical conductivity (EC) in root layer of T1, T2 and T3 was decreased by 31.83%, 50.35% and 46.09%, respectively; the varies of soil pH was not significant but was decreased with the salt drainage time increase, generally; (2) the soil EC was decreased with the soil depth increase, and the decrease rate of salt content in the 0-0.8 m soil layer was significantly higher than that in deep soil layers; moreover, the effect of salt drainage was more obvious when the distance was closer to the shaft; (3) the salinity of drainage water was increased after 1 year salt drainage, however which of T1, T2 and T3 was decreased by 21.41%, 33.24% and 18.57% after 2 years salt drainage, respectively; the underground water level dropped down year by year and decreased by 1.5 m on the average; (4) the average maize yield of different treatments was 329.70 kg/667m², and the yield was T2>T1>T3, which indicated that the salt drainage effect was in proportion to the maize yield.【Conclusion】 According to the effect of water and salt drainage and maize yield, the layout spacing of 8 m (T2) was the suitable parameter for subsurface pipe project; it is suggested to apply the model of shaft and subsurface pipe drainage in in areas of southern Xinjing, which could effectively reduce groundwater level and salt content and maintain the stability and sustainability of the improvement effect of salinization soil.
- Publication
Xinjiang Agricultural Sciences, 2022, Vol 59, Issue 3, p716
- ISSN
1001-4330
- Publication type
Article
- DOI
10.6048/j.issn.1001-4330.2022.03.022