Method for monitoring ammonia volatilization emission amount of orchard soil

Abstract

The invention belongs to the technical field of soil conditioning and discloses a method for monitoring ammonia volatilization emission of orchard soil. The method comprises the following steps of 1, selecting a peach orchard with 3m*3m peach trees as a monitoring object; 2, selecting an air exchange chamber; 3, three ammonia volatilization closed air exchange chamber sampling boxes being arranged in three distance intervals which are 0-45 cm, 45-90 cm and 90-135 cm away from the tree trunk in the vertical direction; and 4, introducing the ammonia gas in the air exchange chamber into the absorption liquid due to the negative pressure provided by the vacuum air pump, wherein the vacuum air pump ensures that the air exchange rate of the air exchange chamber is 10-15 times / min. 5, the air exhaust time being 9: 00-11: 00 in the morning and 15: 00-17: 00 in the afternoon, and the air exhaust time being 4 hours; and 6, after gas extraction is finished, filtering the absorption liquid, determining the concentration of ammonium ions through a flow analyzer, calculating to obtain three ammonia volatilization cumulants at different distances, and adding the three ammonia volatilization cumulants to obtain the total ammonia volatilization amount of the fruit tree plot.

Description

technical field [0001] The invention belongs to the technical field of soil regulation, and in particular relates to a method for monitoring ammonia volatilization emission in orchard soil. Background technique [0002] Ammonia volatilization in farmland soil is a series of physical and chemical changes at the soil solid-liquid-gas interface after nitrogen fertilizers are applied to the farmland, resulting in the volatilization of nitrogen into the air in the form of ammonia. Farmland soil ammonia volatilization mainly occurs in Within one week after nitrogen fertilizer application, the amount of nitrogen loss accounts for about 2-40% of the nitrogen application amount, which is an important way of nitrogen loss in farmland. [0003] At present, the main method to monitor the volatilization of ammonia in farmland soil is the closed chamber intermittent pumping method. This method is usually suitable for rice, wheat, corn and other crops with uniform fertilization and high pl...

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Problems solved by technology

Compared with these uniformly fertilized crops, the orchard planting system has the characteristics of sparse planting density, large fruit tree tray area, fertilization by plant, ring fertilization, uneven fertilization, and obvious fertilization intervals. The corresponding ammonia volatilization emissions have Obvious regionality, using the traditional monitoring method to represent the ammonia volatilization emission produced by the whole orchard planting area with the value of a monitoring point, often overestimates or underestimates the actual ammonia volatilization emission of the orchard, so in the original It is necessary to improve the technical method and develop a suitable method for accurately monitoring the ammonia volatilization emission in orchards

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