Method for detecting inherent error of ammonia volatilization of farmland by in-situ synchronous correction static chamber method

A technology of synchronous correction and inherent error, which is applied in the direction of measuring devices, analyzing materials by chemical reaction, and analyzing materials by observing the influence of chemical indicators, so as to reduce the effect of inherent measurement errors

Inactive Publication Date: 2017-05-24
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

Among them, the static box method is the most widely used box method, but the obvious disadvantages of the static box method are: the sampling device changes the natural environment, and the ammonia concentration gradient, pressure gradient, turbulent pulsation and gas flow in the device are different from those under natural conditions. It is completely different, the ammonia volatilization is measured in a closed state, and the research results are basically qualitative

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  • Method for detecting inherent error of ammonia volatilization of farmland by in-situ synchronous correction static chamber method
  • Method for detecting inherent error of ammonia volatilization of farmland by in-situ synchronous correction static chamber method
  • Method for detecting inherent error of ammonia volatilization of farmland by in-situ synchronous correction static chamber method

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Experimental program
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Embodiment 1

[0039] The experiment of this embodiment is carried out in the farmland of the National Field Scientific Observation and Research Station of Fengqiu Farmland Ecosystem of the Chinese Academy of Sciences. In the experiment of this embodiment, two different simulated ammonia volatilization sources were used.

[0040] 1) Preparation of two different simulated ammonia volatilization sources:

[0041] Type 1 of simulated ammonia volatilization source: firstly, ammonium sulfate reagent is used to prepare 100 mL of ammonium sulfate solution with a concentration of 0.01 mol / L, and put it in a weighed petri dish with an inner diameter of 12 cm and a height of 2 cm. The petri dish is placed on the surface of farmland soil as Simulate the source of ammonia volatilization; prepare 6 same petri dishes, of which 3 are placed in the natural environment, and 3 are placed in the static box method measurement device; each petri dish is added with a concentration of 1mol / L sodium carbonate solutio...

Embodiment 2

[0053] In this example, the difference of ammonia volatilization correction coefficient between daytime and nighttime is compared, and the experiment is carried out in the farmland of Fengqiu Farmland Ecosystem National Field Scientific Observation and Research Station of Chinese Academy of Sciences.

[0054] 1) First, use ammonium sulfate reagent to prepare 500 mL of ammonium sulfate solution with a concentration of 0.01 mol / L, put it in a weighed fresh-keeping box with an inner diameter of 12 cm and a height of 6 cm, and dig a hole with a depth of 5 cm and an inner diameter of about 12.5 cm on the farmland ground , the fresh-keeping box is placed in the hole as a simulated ammonia volatilization source; the same fresh-keeping box is used to prepare 6 simulated ammonia volatilization sources, of which 3 are placed in the natural environment, and 3 are placed in the static box method measurement device; Add 10 mL of 1mol / L sodium carbonate solution to start ammonia volatilizati...

Embodiment 3

[0065] In the monitoring of ammonia volatilization in farmland, the micrometeorological mass balance method is generally considered to be a more accurate method for the determination of ammonia volatilization, and is often used as a reference method for the determination of ammonia volatilization.

[0066] In this example, the mass balance method and the static box method are used to simultaneously measure the volatilization of ammonia in the farmland after topdressing the crop corn, and the technical solution of the present invention is used to simultaneously correct the measurement results of the static box method in situ. The system is carried out in farmland outside the National Field Scientific Observation and Research Station.

[0067] 1) Mass balance method:

[0068] Divide a circular test area with a radius of 20m in the farmland, and vertically place a steel pipe with a height of 2.5m and a diameter of about 3cm in the center of the circular test area; spread urea 25k...

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Abstract

The invention discloses a method for detecting the inherent error of ammonia volatilization of a farmland by an in-situ synchronous correction static chamber method. The method comprises the following steps: firstly, preparing ammonia solutions with different concentrations by adopting an ammonium sulfate reagent, and putting the ammonia solutions in farmlands with crispers to serve as different simulated ammonia volatilization sources with different volatilization strengths; respectively putting the simulated ammonia volatilization sources in a farmland natural environment and a static chamber method detection device to simulate actual ammonia volatilization and ammonia volatilization in the device, synchronously detecting the simulated ammonia volatilization source and ammonia volatilization of farmland at the same time interval, adding sodium carbonate into the simulated ammonia volatilization source to start ammonia volatilization, and terminating the ammonia volatilization process with a diluted sulfuric acid solution when the stage ammonia volatilization is completed; calculating the volatilizing speed of the simulated ammonia volatilization source and farmland volatilization after sampling is completed, preparing a correction curve by the ratio of ammonia volatilization speed at two environments and the ammonia volatilizing speed in the static chamber method detection device, and acquiring the farmland ammonia volatilizing speed with corrected environmental disturbance inherent error through the correction curve. According to the method, the inherent detection error caused by static chamber method sampling device disturbing natural environment can be greatly reduced.

Description

[0001] 1. Technical field: [0002] The invention relates to a static box method for measuring farmland ammonia volatilization, in particular to a method for in-situ synchronously correcting the inherent error of the static box method for measuring farmland ammonia volatilization. [0003] 2. Background technology: [0004] The determination methods of ammonia volatilization in farmland are mainly divided into two types: micrometeorological method and box method. The micrometeorological method directly samples the air above the farmland without changing the natural environment, so it does not interfere with the ammonia volatilization process, and the measurement results are true and accurate. It is the preferred method for quantitatively monitoring the ammonia volatilization in the farmland; In addition, complex and expensive measuring instruments are required, which limits the application of micrometeorological methods. The box-type method is simple in principle, easy to make...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N33/00
CPCG01N21/783G01N33/0006
Inventor 朱安宁杨文亮信秀丽张佳宝张先凤
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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