Open type multi-air-chamber method soil respiration value monitoring method

Abstract

The invention provides an open type multi-air-chamber method soil respiration value monitoring method. The method comprises the steps: selecting a stable and continuous soil carbon dioxide concentration time sequence according to the Fick second law; substituting the soil carbon dioxide concentration time sequence value into a Fick first law to calculate a soil carbon flux value changing with time, and then utilizing wavelet packet transformation to obtain a soil carbon flux time sequence with relatively low noise content; according to a calculated signal-to-noise ratio of the carbon dioxide concentration, respectively calculating four closeness degrees of the carbon dioxide concentration, the temperature, the air pressure and the humidity of each air chamber by utilizing a maximum and minimum closeness degree method; and finally obtaining the distribution weight of each air chamber according to the four closeness degrees; multiplying the soil carbon flux time sequence by the distribution weight of each air chamber to carry out weighted fusion to finally obtain a data fusion result, and making a decision according to the weighted fusion result. By means of the method, the soil respiration value at every moment can be accurately obtained, and low-cost soil respiration monitoring is achieved.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to an open-type multi-air chamber soil respiration value monitoring method. Background technique [0002] When using the open multi-air chamber method to monitor soil respiration, since the sensors are vertically distributed in the soil respiration monitor, when soil carbon dioxide diffuses from the soil to the air chamber, the sensors at different heights receive and express different soil carbon dioxide concentration signals. Therefore, each layer of air cells has a different ability to express soil respiration. It is generally believed that the closer the air cell is to the ground, the more effectively the air cell can express soil respiration. However, the open multi-air chamber method is susceptible to interference from external airflow factors when monitoring soil respiration, resulting in changes in the diffusion of carbon dioxide in the air chamber and interfering with...

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Problems solved by technology

However, the open multi-air chamber method is susceptible to interference from external airflow factors when monitoring soil respiration, resulting in changes in the diffusion of carbon dioxide in the air chamber and interfering with the monitoring of soil respiration by the air chambers. When respiration is expressed, the deviation from real soil respiration needs to be understood through a reasonable analysis of the data obtained from the sensors in each layer of the air chamber.

However, due to neglect of this point in the previous soil respiration monitoring methods, there is a certain error between the calculated soil respiration and the real value.

[0003] Moreover, the existing technology cannot monitor the soil respiration data in real time. The reason is that the existing technology obtains the soil respiration value by calculating the slope of the soil respiration concentration, etc., so it is impossible to obtain the soil respiration value every moment, and when the device As an open soil respiration monitor, there is no need to consider that the accuracy of the soil respiration value will decrease when the carbon dioxide concentration in the air chamber is too high. cell fusion

[0004] In summary, it can be seen that the defects of the existing technology are: the detection results of the existing methods for detecting soil carbon dioxide are not accurate enough, and real-time monitoring cannot be realized

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