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Method for measuring rice field greenhouse gases based on rice field soil solution

A soil solution, greenhouse gas technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effects of strong representation, low cost, and simple operation process

Active Publication Date: 2017-02-15
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the problem existing in the prior art is: how to simply and accurately measure the rice field greenhouse gas emission

Method used

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  • Method for measuring rice field greenhouse gases based on rice field soil solution
  • Method for measuring rice field greenhouse gases based on rice field soil solution
  • Method for measuring rice field greenhouse gases based on rice field soil solution

Examples

Experimental program
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Effect test

example 1

[0035] Before transplanting rice, soil solution collectors were buried at different depths (5cm, 15cm) of the plow layer soil of the paddy field. After the rice is transplanted, the soil solution is collected in situ at the four growth stages of the seedling stage, jointing stage, booting stage, and maturity stage. When collecting, a medical syringe, a three-way valve is connected to the soil solution collector, and the negative pressure is used to collect the soil solution. The soil solution at different depths (5cm, 15cm) of the plow layer soil of paddy field was extracted respectively by this method. This completes the collection of the soil solution.

example 2

[0037] Vacuum the vacuum bottle with a vacuum pump in advance, then use the above corresponding syringe to measure about 5mL of soil solution, install the needle of the syringe, pierce the rubber stopper of the vacuum bottle, and slowly inject 5mL of soil solution into the vacuum bottle. Gently shake the liquid in the vacuum bottle and fill it with pure N 2 After balancing the gas in the vacuum bottle, let it stand for 24 hours to ensure that the gas released from the solution in the vacuum bottle tends to be stable and balanced for testing.

example 3

[0039] CO 2 、CH 4 , N2 The concentration of O was measured with a 7890A gas chromatograph produced by Agilent. Calculate the gas concentration according to the formula: sample gas concentration = standard sample concentration × sample peak area / standard sample peak area. The specific measurement method is as follows:

[0040] CO 2 The concentration of the gas was measured with a 7890A gas chromatograph produced by Agilent, and the detector was a thermal conductivity detector (TCD). The chromatographic column is an 80 / 100 mesh Chromosorb packed column. The temperatures of the injector, detector and packed column are 100°C, 60°C and 60°C respectively, the carrier gas is high-purity hydrogen, and the pressures are 300KPa, 100KPa and 100KPa respectively. The carrier gas flow rate was 80 mL / min. With 356ppm, 653ppm and 984ppm CO 2 The standard gas calibration instrument is recorded by the Agilent Chromatopac 7890A integrator, and the concentration of the gas to be measured i...

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Abstract

The invention discloses a method for measuring rice field greenhouse gases based on rice field soil solutions, and the method comprises the following steps: (10) soil solution collection, to be more specific, using soil solution collectors to collect soil solutions at different soil depths in a rice field; (20) soil solution standing, to be more specific, injecting the soil solutions into vacuum flasks, and standing for 24 hours; and (30) greenhouse gas determination, to be more specific, using a gas chromatograph for measurement of the concentration of greenhouse gases in the soil solutions. The method for measuring the rice field greenhouse gases has the advantages of simple operation and accurate measurement results.

Description

technical field [0001] The invention belongs to the technical field of agricultural ecological environment monitoring, in particular to a paddy field greenhouse gas measurement method based on paddy field soil solution with simple operation and accurate measurement. Background technique [0002] Global climate change is a common concern of the international community today, and it is also the most serious environmental problem facing mankind. Climate warming is an important manifestation of it. carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O) are three typical and most important greenhouse gases. Atmospheric CO 2 、CH 4 , N 2 The increase in the concentration of greenhouse gases such as O is the main cause of global warming. Farmland is the main component of terrestrial ecosystems and an important source of greenhouse gas emissions. Greenhouse gases emitted by global agricultural production activities account for 10-12% of human activity emissions, and t...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 王小治王亚波魏思雨
Owner YANGZHOU UNIV
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