【摘要】 通过田间试验,对比研究了秸秆排水体和PVC波纹管对滨海盐渍土的排水脱盐效果。结果表明,秸秆排水体和PVC波纹管排水的单位面积排水总量分别为0.012 8、0.014 7m3/m2,单位面积排盐总量分别为76.06、55.77g/m2,排水矿化度比埋管前分别下降46.26%、32.66%;0~100cm土壤剖面,各土层土壤脱盐率差异较大,秸秆排水体为34.32%~48.75%,PVC波纹管为30.33%~53.24%。1m土体中,秸秆排水体的土壤脱盐率比PVC波纹管低1.48%,但60~100cm土层秸秆排水体脱盐效果明显高于PVC管。秸秆排水体作为暗管排水材料,可加速土壤脱盐,排水脱盐效果显著,能够有效改良盐碱土。更多还原

【Abstract】 The effects of subsurface pipe materials(including straw draining piece and PVC bellows)on drainage and desalination of coastal saline-alkali soils were studied through subsurface draining experiments.The results showed that lots of salts were removed from the experiment plots of straw draining piece and PVC bellows,the drainage discharges on unit area were 0.012 8m3/m2,0.014 7m3/m2 respectively,the amounts of salt drained on unit area were 76.06g/m2,55.77g/m2 separately,and the drainage water salinity declined by 46.26%,32.66% respectively compared with the groundwater salinity before laying pipe.There was a big difference of soil desalinization rate in 0~100cm soil profiles between the plots of straw draining piece and PVC bellows.Soil desalinization rates in profiles of C50 and P45plots were 34.32%~48.75% and 30.33%~53.24% respectively.Soil desalinization rates of 0~100cm soil layer on plot of straw draining piece was 1.48%less than those in the other plot,but the effect of straw draining piece on desalinization of 60~100cm soil profiles were more prominent than that of the PVC bellows plot.As a material of drainage pipe,straw draining piece could accelerate desalination and improve saline soil effectively,and the effects of this material on drainage salinity and desalination were significant.更多还原