土壤学报2018，Vol.55Issue(1)：111-121,11.DOI:10.11766/trxb201706200271
滴灌条件下排水暗管埋深及管径对土壤盐分的影响
Impacts of Diameter and Depth of Drainage Pipes in Fields under Drip Irrigation on Soil Salt
摘要
Abstract
[Objective]To find a water efficient technique using underground drainage pipes to wash off soil salt is an issue that has aroused attention from scientists all over the world,because such a technique would make great valuable contribution to agricultural production and economic returns,especially in regions that have large areas of saline alkali soils. [Method] In this paper,a field experiment was conducted with drainage pipes,50 mm or 90 mm in diameters,buried 0.6 m,1.0 m or 1.4 m deep in the field under drip irrigation to explore effect of the usage of drainage pipes on soil salinity,relative to diameter and burial depth of the pipe. [Result] The experiment shows that desalinization effect of two rounds of drip irrigation varied from soil layer to soil layer. The effect was the highest in the 0~60 cm soil layer,lowering the soil salt content down below 12 g kg-1or to the moderate salinization level,but the effect was not significant in the soil layers below 100 cm. Drainage pipes buried at 0.6 m in depth were higher than those 1.0 and 1~4 m in depth in desalination effect,reducing soil salt content by 14.34 g kg-1in total,or by 13.32 g kg-1as compared with CK,field without using drainage pipes Pipes buried at 1.4 m had no significant effect on soil desalinization. The pipes different in diameter varied in desalinization effect. Pipes 90 mm in diameter were much higher than those 50 mm. The effect of pipes 50 and 90 mm in diameter varied with burial depth,being in the range of 20.69%~30.20% and 34.59%~57.04%,respectively. [Conclusion]In the fields with drainage pipes 90 mm in diameter buried 0.6 m in depth,two rounds of drip irrigation reduced soil salinization in the 0~60 cm soil layer to the mild salinization level (3~6 g kg-1),indicating that the technique is high in desalinization efficiency and applicable to the regions of salt-affected soils in Xinjiang. And the findings in this paper may serve as scientific basis for choice of diameter and burial depth of drainage pipes in application of the technique.关键词
滴灌/暗管排水/盐碱土/设计参数/脱盐率Key words
Drip irrigation/Dark tube drainage/Saline soils/Designed parameters/Desalination rate分类
农业科技引用本文复制引用
衡通,王振华,李文昊,张金珠,杨彬林..滴灌条件下排水暗管埋深及管径对土壤盐分的影响[J].土壤学报,2018,55(1):111-121,11.基金项目
国家自然科学基金项目(41361071)和"十二五"国家科技支撑计划项目(2015BAD20B03-3)资助 Supported by the National Natural Science Foundation of China(No. 41361071)and National "Twelfth Five-Year" Plan for Science and Technology Support of China(No. 2015BAD20B03-3) （41361071）
