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蒸渗仪是用来研究营养元素在农田中的运移的系统,本文系统描述了一种大型蒸渗仪的设计,建造与安装。试验采用湖北地区典型土壤类型黄棕壤与潮土,在华中农业大学校园内每种土壤安装16个大型蒸渗仪。蒸渗仪采用减少土柱的扰动的方法建造,并填充凡士林减少土壤水分的边缘流动。蒸渗仪采用外径630mm高700mm厚10mm的PVC管作材料。土柱建成后安装在预制PVC底座上,底座中间有一圆孔外接淋失液收集装置。淋失液收集后用来测定淋失液离子含量。试验结果表明,相同土壤土柱之间淋失量差异不显著,没有检测到水分的边缘流动;同时建设效率高,费用低。
Lysimeter is a system used to study the migration of nutrient elements in farmland. This paper systematically describes the design, construction and installation of a large-scale lysimeter. In this experiment, yellow brown soil and alluvial soil, typical soil types in Hubei Province, were used in the experiment. Sixteen large-scale lysimeter were installed on each soil in Huazhong Agricultural University campus. The lysimeter was built using a method of reducing soil column disturbances and filled with petroleum jelly to reduce the edge flow of soil moisture. The lysimeter is made of PVC pipe whose outer diameter is 630mm, height is 700mm and thickness is 10mm. After the earth column is installed on the prefabricated PVC base, there is a round hole in the middle of the base for the external leaching liquid collecting device. Liguo fluid collection used to determine leaching fluid ion content. The test results show that there is no significant difference in leaching amount between soil columns of the same soil, no edge flow of moisture is detected, meanwhile the construction efficiency is high and the cost is low.