Method for obtaining standard instantaneous CO2 flux of soil profile

An acquisition method, CO2 technology, applied in the direction of measuring devices, suspension and porous material analysis, particle suspension analysis, etc., to achieve the effect of increasing reliability, reliable fitting results, and reducing errors

Inactive Publication Date: 2011-01-05
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently relevant standard CO 2 Flux content is rarely reported

Method used

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  • Method for obtaining standard instantaneous CO2 flux of soil profile
  • Method for obtaining standard instantaneous CO2 flux of soil profile
  • Method for obtaining standard instantaneous CO2 flux of soil profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In order to prove the implementation effect of the present invention, in the soil groove of glasshouse (groove width 60cm, depth 30cm) prearrange soil air collector, and in the flowering period of cucumber growth, choose 3 days (October 9th, 16th and 24th) and carried out standard CO2 measurements at depths of 5, 10, 15 and 20 cm in the soil from 9:00 to 11:00 every morning. 2 Flux measurement. Using LI-840 CO 2 Analyzer measures CO 2 For the change of concentration, the measurement time is 5min, and the data recording frequency is 10s. CO was measured by SigmaPlot software after measurement. 2 The hyperbolic relationship between the concentration and the measurement time is fitted, and then the standard CO is calculated 2 Concentration change rate and standard instantaneous CO 2 flux value. And the standard flux of the present invention is compared with the flux at t=0 and the flux value obtained by conventional methods, and the calculation results are shown in T...

Embodiment 2

[0038] In order to further prove the implementation effect of the present invention, in the test of planting cucumbers, carry out the standard instant CO of soil 5cm, 10cm, 15cm and 20cm depth in different periods (7:00~17:00) in a day. 2 Flux assay. Using LI-840 CO 2 Analyzer measures CO 2 For the change of concentration, the measurement time is 5min, and the data recording frequency is 10s. CO 2 The hyperbolic relationship between the concentration and the measurement time is fitted, and then the standard CO is calculated 2 Concentration change rate and standard instantaneous CO 2 flux value. And compare the standard flux of the present invention with the flux at t=0, and the flux value obtained by the conventional method, the results are shown in Table 2 below. Table 2 and figure 2 It further shows that the present invention is equally applicable to the determination of any period of the day.

[0039] Table 2 The standard instantaneous CO at 10cm depth of soil at d...

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Abstract

The invention discloses a standard instantaneous CO2 flux concept of a soil profile and an obtaining method thereof. The method comprises the following steps of: firstly, detecting CO2 concentration in certain soil layer depth by an infrared CO2 analyzer and carrying out hyperbolic equation fit on the change of the CO2 concentration along with detecting time by software to obtain parameters a and b; using acknowledged atmosphere CO2 concentration as reference Ct to be substituted into a hyperbolic equation and calculating corresponding time t<s>; solving a first-order derivative of the hyperbolic equation by Ct to the time t and substituting a t<s> value into a derivative calculation formula to obtain a standard CO2 concentration change rate parameter corresponding to the time; and finally, substituting the standard CO2 concentration change rate parameter into a flux calculation formula to obtain the standard instantaneous CO2 flux of the detected soil layer. The invention can be used for carrying out rapid detection on multiple groups of repeated tests, reduces errors caused by detecting time intervals among a plurality of repeated tests and improves the reliability of data.

Description

technical field [0001] The invention relates to the technical field of agricultural environment information detection, in particular to a soil profile standard instant CO 2 How to get flux. Background technique [0002] Soil profile CO 2 Accurate monitoring of fluxes is an important part of the study of carbon cycle processes in terrestrial ecosystems. Obtain the instantaneous CO of a certain soil layer in the soil profile 2 The common method of flux is generally through the continuous measurement of CO in the corresponding soil layer. 2 The concentration changes at the measurement time, and then according to the CO before and after the measurement time 2 The difference in concentration, or by using a linear fit, calculates the CO per unit measurement time 2 The average rate of change of the concentration, and then get the CO of the corresponding soil layer 2 flux value. It can be seen that what is calculated from this is only the average value of the flux within the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
Inventor 朱咏莉吴沿友李萍萍鲁珊杨波
Owner JIANGSU UNIV
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