Method for monitoring farmland ammonia volatilization in real time based on laser absorption spectrum technology

A technology of laser absorption spectroscopy and real-time monitoring, applied in the measurement of color/spectral characteristics, etc., to achieve high temporal resolution and improve the efficiency of nitrogen fertilizer utilization

Inactive Publication Date: 2012-09-19
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is still in the research and exploration stage in the world. It is mainly used in the monitoring of ammonia in farms and composts. It is rarely used in the monitoring of ammonia volatilization in farmland. The domestic application research has just started.

Method used

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  • Method for monitoring farmland ammonia volatilization in real time based on laser absorption spectrum technology
  • Method for monitoring farmland ammonia volatilization in real time based on laser absorption spectrum technology
  • Method for monitoring farmland ammonia volatilization in real time based on laser absorption spectrum technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Test equipment

[0025] The test uses an open long-path diode laser absorption spectrometer to measure the ammonia concentration in the air. The sensitivity of the ammonia concentration measurement is shown in Table 1. The CSAT3 three-dimensional ultrasonic anemometer (produced by Campbell, USA) is used to collect meteorological data. The main components include: CR1000 data collector , CSAT3 ultrasonic anemometer. The reverse Lagrangian random diffusion model was used to simulate ammonia volatilization by the commercial software WindTrax2.0 (developed by Thunder Beach Scientific, Nova Scotia, Canada).

[0026] Table 1 Sensitivity of open-type long-path diode laser absorption spectrometer to measure air ammonia concentration

[0027] the gas

Sensitivity (ppm-m)

1m

10m

100m

Ammonia

5

5

0.5

0.05

[0028] 2. Experimental design

[0029]The experiment was carried out in the corn field outside the Natio...

Embodiment 2

[0038] 1. Test equipment

[0039] The ammonia concentration was measured in the same way as in Example 1; the wind speed at heights of 0.8, 1.6, 2.5, 3.5 and 5m was measured with a cup anemometer at the place where the spectrometer was set, and the wind direction and air temperature at the same height were measured at the same time, and a set of data was recorded every 30 seconds. The reverse Lagrangian random diffusion model was used to simulate ammonia volatilization by the commercial software WindTrax2.0 (developed by Thunder Beach Scientific, Nova Scotia, Canada).

[0040] 2. Experimental design

[0041] The test was carried out on the bare land outside the National Field Scientific Observation and Research Station of Fengqiu Farmland Ecosystem of the Chinese Academy of Sciences after the corn was harvested. A circular plot with a radius of 20m was drawn in the center of the farmland of about 100 mu as the test area, and the surface was sprinkled after irrigation. urea. ...

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Abstract

The invention relates to a method for monitoring farmland ammonia volatilization in real time based on laser absorption spectrum technology, which comprises the following steps of using an open type long optical path diode laser absorption spectrograph to measure the ammonia concentrations of the volatilization source in the upwind direction and the downwind direction simultaneously; using a three-dimensional ultrasound anemobiagraph to measure meteorological data such as three-dimensional wind speed and temperature, or using a profile weather system to measure the wind speed, temperature and wind direction of different heights; estimating the theory proportion (C/Q) sim of the concentration to the volatilization rate of the air through reverse analog of the motion track of the air particle from the volatilization source to the air concentration monitoring position based on the ammonia concentration and the metrological data; and calculating the air volatilization rate Q (Mu g*m<-2>*s<-1>) by the following formula and getting rid of abnormal analog value according to the metrological data. The method is applicable to volatilization sources of any scale and shape, and can continuously monitor ammonia volatilization on line in real time with advantages of non contact, high sensitivity, high selectivity, and high time resolution ratio.

Description

technical field [0001] The invention relates to a method for monitoring farmland ammonia volatilization, in particular to a method for real-time on-line monitoring of field ammonia volatilization based on an open long-path diode laser absorption spectroscopy technique. Background technique [0002] The determination of farmland ammonia volatilization mainly adopts soil balance method, closed chamber method and micro-meteorological method. The soil balance method estimates the volatilization of ammonia from the amount of fertilization, plant absorption, soil residue and leaching. Due to the large number of measurement items and the denitrification is not considered, the general error is relatively large, and it is basically not used now. The closed chamber method is the most widely used method at present. Its device is relatively simple and the conditions are easy to control. It can estimate the material exchange of soil-ammonia at a certain point, and is suitable for plot ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 朱安宁杨文亮张佳宝信秀丽
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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