论文部分内容阅读
深入探求再生水灌溉条件下不同土壤中水分和溶质的分布及斥水性变化规律,能为再生水灌溉条件下土壤斥水性产生原因及其影响因素的研究提供一定的参考。选用砂土、砂姜黑土、塿土和盐碱土进行土柱再生水灌溉试验,取样测定不同灌水量条件下剖面土壤的潜在斥水性、含水率、Cl-、有机质(organicmatter,OM)含量及电导率(electrical conductivity,EC)等。结果表明:再生水灌溉后,塿土及盐碱土分别出现0～2,1～3级斥水性,砂土及砂姜黑土为0级斥水性,4种土表层表现出较强的斥水性。土壤斥水性随再生水灌水量和灌溉时间的增加而显著增强,并且灌水量越大,斥水性差异性越显著。4种土有机质含量OM与土壤斥水持续时间变化值TR呈正相关关系,Cl-含量、EC值与土壤斥水持续时间变化值TR呈负相关关系。相比较其他3种土而言,砂土更适合再生水灌溉。
In-depth study of water and solute distribution and water repellency in different soils under reclaimed water irrigation can provide some references for the reasons and influencing factors of soil water repellency under the condition of reclaimed water irrigation. Sand soil, saprolium black soil, clayey soil and saline-alkali soil were selected for soil reclaimed water irrigation test. The potential water-repellency, moisture content, Cl-, organic matter (OM) content and conductivity (electrical conductivity, EC) and so on. The results showed that after the reclaimed water was irrigated, the 0 ~ 2 and 1 ~ 3 water repellency appeared in the soil and saline-alkali soil, the water-repellency of the soil and lime-black soil was 0, and the water-repellency of 4 soil layers showed strong. Soil water repellency significantly increased with the increase of irrigation water and irrigation water, and the greater the irrigation water, the more significant difference of water repellency. There was a positive correlation between OM and soil water repellent duration (TR) of four kinds of soil organic matter. There was a negative correlation between Cl- content and EC value and TR value of soil water repellent duration. Compared with the other three kinds of soil, sand is more suitable for reclaimed water irrigation.