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京津渤地区由于水资源的紧张,利用城市污水灌溉农田是一个十分现实的问题。本实验的目的是研究在模拟污灌条件下,氮素在土壤-植物系统中的淋失规律;模拟污水冬灌,氮素的保持和淋失规律以及冬灌后效反应。为实行科学污灌与发展城市污水的土地处理系统提供科学依据。实验所用的3种污灌土壤,均系在京津地区具有代表性的土壤——潮土,其基本理化性状列于表1。实验装置采用直径10厘米的塑料管,其中按排土层厚度为80厘米,保持原来土壤自然层次,模仿其松紧度。此管底部备有采集水样装置,定时收集淋失液供分析NO_3~--N、NO_2~--N、NH_4~+-N、有机氮等。实验装置设在防鸟网中,塑料管外备有保护土层。
Due to the shortage of water resources in Beijing-Tianjin-Bohai area, the use of urban sewage to irrigate farmland is a very real problem. The purpose of this experiment is to study the leaching regularity of nitrogen in soil-plant system under simulated sewage irrigation conditions, simulate the law of winter irrigation, nitrogen retention and leaching, and the post-winter response. It provides a scientific basis for the implementation of the system of sewer irrigation and the development of urban sewage treatment system. The three kinds of irrigated soils used in the experiment are all representative soil-alluvial soil in Beijing-Tianjin region, and their basic physical and chemical properties are listed in Table 1. Experimental equipment using plastic pipe diameter of 10 cm, which according to the thickness of soil exclusion 80 cm, maintaining the original natural soil level, to imitate the tightness. The bottom of the tube is equipped with a water sampling device, and the leaching fluid is regularly collected for the analysis of NO 3 -N, NO 2 -N, NH 4 -N, organic nitrogen and the like. Experimental equipment located in the bird’s nest, the plastic pipe with protective soil outside.