A study on the purification of wastewater with sprinkling management to suburban forest

对城郊次生林污水的喷淋净化进行了研究。通过这个研究项目，我们可以得到如下的结果。以D2O和15HN4Cl分别作为水分和营养元素示踪剂，研究了次生林表层土壤水分和主要离子的垂直运动。用氯乙烯管制成的圆筒在不同的立地收集原状土柱。采用人工降雨装置，分两次将降雨液均匀滴在塔身上。人工降雨持续10小时，强度为4mm/hr。第二次降雨时，将标记为D2O和15NH4Cl的示踪液涂于柱上。随着D2O的排放，Cl-、Mg2+和Ca2+的浓度增加，只有少量的15NH4+- n在褐林土壤柱上向低层移动。d2o标记水的下降速度与Mg2+和Ca2+的下降速度大致一致。但大量的15NH4+-N随着d20标记的水在森林地面清除站收集的柱上排出。在重水排放过程中，由于阴离子被土壤吸收的影响，排放土壤溶液中Cl-在安多酚柱中的浓度没有明显增加。

The purfication of wastewater with sprinkling management was studied in suburban secondary forest. The result that we could got with this research project is the following.The vertical movement of soil water and major ions in topsoil of secondary forests were investgated by using D2O and 15HN4Cl as tracers of water and nutrient elements, respectively. Undisturbed soil columns were collected with cylinders made of vinyl chloride pipe in different stands. The rain soluion was dropped uniformly on the column by using the artificial rainfall equipment in twice. The artificial rainfall was continued for 10 hours at constant intensity of 4mm/hr. At the second time of rainfall, the tracer solution labeled with D2O and 15NH4Cl applied on the column.The concentrations of Cl-, Mg2+, and Ca2+ increased with the D2O discharge and only small quantity of 15NH4+-N moved to the lower horizon on the Brown forest soil columns. The downward velocity of the D2O-tagged water agrred approximately with that of Mg2+ and Ca2+. But large amount of the 15NH4+-N was discharged with the D2O-tagged water on the column that was collected in the forest floor removal stand. In spit of heavy water dischraging, the concentration of Cl- in dischraged soil solution did not increase obviously in Andosol column because of the effect of anion absorption into the soil.