Study on Desalination Effect of Buried Pipe on Coastal Severe Saline-alkali Land
ZHANG Mingze
LIU Fangchun
YANG Qingshan
LIU Binghua
LIU Xinghong
PENG Lin
MA Hailin
SI Dongxia
Abstract：In order to explore the improvement effect of buried pipe layout on severe saline-alkali land in the Yellow River Delta without artificial irrigation,the saline-alkali wasteland in Kenli District of Dongying City was taken as the research object.Four buried pipe layout combinations were set up,including spacing 8 m,buried depth 0.8 m(T1)and spacing 8 m,buried depth 1.1 m(T2)and spacing 12 m,buried depth 0.8 m(T3)and spacing 12 m,buried depth 1.1 m(T4).The soil salt distribution and desalination effect under different buried pipe layout measures were compared.The results showed that:T1,T2,T3,T4,four subsurface pipes were arranged.In the horizontal space,the soil salt content at different positions from the subsurface pipes between the two subsurface pipes was consistent:0＜1/2＜1/4,and the salt content at 0 and 1/2 was significantly lower than that at 1/4.In the vertical space,the soil salt content of each treatment decreased first and then increased with the increase of soil depth.The soil pH values of the four subsurface pipe layout treatments increased first and then decreased with the increase of soil depth,and the soil pH values of 0-20 cm(surface layer)of each treatment were significantly lower than those of the surface soil without subsurface pipe layout(CK).The surface soil salt content of T1,T2,T3 and T4 were 2.78,3.59,3.85 and 6.85 g/kg,respectively,which were 80.44％,74.74％,72.91％and 51.80％lower than that of CK,respectively.In the soil profile,there was a negative correlation between soil salt content and water content.The desalination rate of the four subsurface pipe layout treatments in the 0～60 cm soil layer was significantly higher than that of CK,and the average desalination rate of T2 in the 0～100 cm was the highest,reaching 58.93％.Based on the comprehensive analysis,it is recommended that the spacing of 8 m and the buried depth of 1.1 m are the best layout parameters for the coastal severe saline-alkali land in the Yellow River Delta without artificial irrigation,which can not only reduce the salt content of the surface soil,but also reduce the salt content of the soil.
Keywords：pH valuedesalination ratesalt migration
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 53-59 )