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详细介绍了农田土壤氨挥发风洞法测定系统的原理、构造和特点,并通过回收率试验和田间试验进行了验证。所选用的德国风洞主要包括采样箱、采样系统和控制系统3部分,系统内部的气压、温度、湿度、风速等微气象条件接近自然环境条件,测量结果有较好的代表性。回收实验结果表明,回收率为90%,说明风洞的密闭性和浓度分布的均匀程度较好,适合于土壤氨挥发的多处理、多重复的田间原位测定,尤其适用于多因子对比实验。风洞法测定不受天气的影响,对实验区面积要求不高,重复性及可靠性较好,不仅可以测定农田土壤的氨挥发,还可以测定有机肥贮存和施用以及各种肥料形态的氨挥发状况。
The principle, structure and characteristics of ammonia volatilization wind tunnel method for measuring farmland soil were introduced in detail, and the results were verified by recovery rate test and field experiment. The selected German wind tunnel mainly consists of three parts: sampling box, sampling system and control system. The atmospheric pressure, temperature, humidity, wind speed and other micro-meteorological conditions in the system close to the natural environment conditions, the measurement results are well represented. The recovery experiment results show that the recovery rate is 90%, indicating that the airtightness and concentration distribution of the wind tunnel are better, which is suitable for multi-treatment and multiple-field in situ determination of ammonia volatilization in soil, especially suitable for multi-factor comparison experiment . Wind tunnel method is not affected by the weather, less demanding on the experimental area, good repeatability and reliability, not only ammonia volatilization of farmland soil, but also ammonia storage and application of organic manure and various forms of fertilizer Volatile status.