Method for automatically and continuously measuring ammonia volatilization of farmlands

Abstract

The invention provides a method for automatically and continuously measuring ammonia volatilization of farmlands. The method comprises the step of connecting a soil respirator for automatically and continuously measuring CO2 flux of soil with an ammonia gas analyzer for automatically measuring NH3 concentration in series to realize the automatic and continuous observation of field ammonia volatilization. According to the method, the soil respirator for automatically and continuously measuring CO2 flux of soil is connected with the ammonia gas analyzer for automatically measuring NH3 concentration in series to realize the automatic and continuous observation of field ammonia volatilization; complete daily dynamics and seasonal dynamics of farmland ammonia volatilization can be obtained through the continuous observation, which is beneficial for calculating ammonia volatilization amounts of farmlands; and the continuous observation can be utilized to better evaluate influences, on farmland ammonia volatilization, of fertilization, irrigation and meteorological factors.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method capable of automatically and continuously measuring farmland ammonia volatilization. Background technique [0002] At present, there are mainly aeration method and air extraction method to measure ammonia volatilization in field. The ventilation method ammonia capture device is composed of a polyvinyl chloride rigid plastic tube and two sponges impregnated with glycerol superphosphate solution, and has a simple structure. Immerse 3.8% of the ventilation area of ​​each sponge. During the test, the soil surface in the device and the air circulation between the sponge and the external environment can be ensured. The lower sponge absorbs the ammonia volatilized by the soil, and the upper sponge absorbs ammonia in the air and prevents it from entering the device. It is absorbed by the underlying sponge. According to the ammonia gas absorbed by the sponge i...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the sampling is a fully manual operation, and the sponge needs to be replaced regularly. The sampling time of one sample is longer, generally 1-3 days, and it is difficult to obtain the daily dynamics of ammonia volatilization in farmland within a day.

The disadvantage of this method is that it is all manual operation, the workload is large, and the ammonia volatilization is greatly affected by the ventilation frequency, and the sensitivity is low.

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