The Effect of Subsurface Pipe Drainage Systems on Improving Saline-alkali Land in Chu Valley Basin,Kyrgyzstan

PU Sheng-hai;Karabayev Nulkin;WANG Xin-yong;MA Xue-qin;Research Institute of Soil,Fertilizer and Agricultural Water Conservation,/key laboratory of Oasis Nutrient and Efficient Utilization of Water and Soil Resources,Xinjiang Academy of Agricultural Sciences;Kyrgyzstan National Agricultural University;

Chu Valley Basin;;subsurface pipe drainage;;saline-alkali land;;improvement effect

【Objective】The project aims to clarify the mechanism and effects of saline- alkali lands improvement by the technology of the subsurface pipe drainage system in Chu Valley Basin of Kyrgyzstan,and provide a theoretical basis for the improvement and utilization of Saline- alkali land in Xinjiang.【Method】From the early 1960 s,the technology of the subsurface pipe drainage system began to be used in the teaching experimental farm of the national agricultural university,This paper carried out comparative analysis of quality of groundwater,eight soil ions in soil and soil texture before and after treatment( 2013).【Result】After Improving saline- alkali land by using the covered pipe salt draining,the total volume of soil salinity reduced to 0.64% or less,each ion content was significantly reduced,saline- alkali land become non- saline soil,and the groundwater level has been significantly controlled together to ensure that the crop yield and soil fertility restoration. In addition,the heavy loam changed to medium loam,soil porosity was increased,and gas content and soil permeability were improved,too,which will be beneficial to the growth of roots. 【Conclusion】Thesubsurface pipe drainage system can effectively improve soil physical and chemical properties of saline- alkali soil and obviously desalinize soil salinity. The introduction of the technology will have significant scientific value and practical significance to improving saline- alkali land and preventing salinization in Xinjiang.