农业机械学报2017，Vol.48Issue(8)：253-261,9.DOI:10.6041/j.issn.1000-1298.2017.08.029
滴灌条件下排水暗管间距对土壤盐分淋洗的影响
Effects of Drainage Pipe Spacing on Soil Salinity Leaching under Drip Irrigation Condition
摘要
Abstract
In order to explore the water saving and efficient alkali-saline land pattern,the underground pipe drainage experi ment was designed under the condition of drip irrigation to seek the effects of different buried spacings in the width of 15 m,20 m and 25 m on salt distribution in soil profile and the desalination and leaching.The results showed that soil salinity in 0 ～70 cm soil layer was decreased significantly during the drip irrigation,and compared with CK the average salinity of soils was decreased by more than 10 g/kg.Different spacing widths of 15 m,20 m and 25 m below 100 cm soil layer indicated different maximum soil desalination rates,which were 86.47％,84.79％ and 81.35％,respectively,and the total desalination rate of soil was between 51.82％ and 60.43％.The smaller the spacing of the buried pipe was,the larger the drainage flow in the drainage and drainage salinity and conductivity were,and thus the cost would be slightly higher.However,compared with 20 m and 25 m,the actual investment was increase by 8 430 yuan/hm2 and 12 570 yuan/hm2 in the spacing of 15 m and the overall soil desalination rate was increased by 1％.When 15 m spacing drainage pipes in the horizontal distances of 0 m,5 m and 7.5 m,the maximum soil desalting rate was 86.47％,85.15％ and 84.01％,respectively,and drainage flow,salinity and conductivity during drainage were 2 m3/h,189.15 g/L and 35.9 mS/cm,respectively.Besides,soil salinity leaching curve fitting effect was better than 20 m and 25 m spacing area,and overall level of soil layer below 70 cm was fallen to below 10 g/kg and crop growth conditions were greatly improved,which was suitable as a parameter for the layout of the underground pipe drainage pipe of Xinjiang saline soil.These results revealed that the drip evolution mode had great importance for the underground pipe drainage salinity,laied the foundation for the following long-term research,ultimately achieved improvement goals,and met the conditions for the growth of the crops.关键词
盐碱土/滴灌/暗管排水/脱盐率/淋洗Key words
saline soils/drip irrigation/underground pipe drainage/desalination rate/leaching分类
农业科技引用本文复制引用
王振华,衡通,李文昊,张金珠,杨彬林,姜昱杉..滴灌条件下排水暗管间距对土壤盐分淋洗的影响[J].农业机械学报,2017,48(8):253-261,9.基金项目
“十二五”国家科技支撑计划项目(2015BAD20B03-3)和国家自然科学基金项目(41361071) （2015BAD20B03-3）
