Rapid detection method for organic matters in soil based on infrared spectroscopic intelligent identification model

A technology of infrared spectroscopy and detection methods, which is applied in non-destructive measurement, accurate and fast fields, and can solve problems such as large background interference, affecting model accuracy and universality, and interference effects

Active Publication Date: 2016-04-13
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Combining infrared spectroscopy with chemometric methods to construct a prediction model can realize the prediction of soil organic matter content. This type of model is based on a given sample for model construction. The model is single and stable, and the calibration set and verification set are relatively fixed.
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  • Rapid detection method for organic matters in soil based on infrared spectroscopic intelligent identification model
  • Rapid detection method for organic matters in soil based on infrared spectroscopic intelligent identification model
  • Rapid detection method for organic matters in soil based on infrared spectroscopic intelligent identification model

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Embodiment 1

[0051] (1): 933 soil samples were collected, all of which were 0-20cm surface soil. The collected samples were air-dried, ground and passed through a 2mm hole sieve. Among them, 711 are used as training samples and 222 are used as test samples.

[0052] (2): Soil training samples are sampled at 100-200 mg per part. This embodiment adopts a Fourier transform mid-infrared spectrometer (Nicolet6700, ThermoFisherScientific, USA)-photoacoustic accessory (PA300, MTEC, USA) sample pool, and the sample is put into the light No more than 2 / 3 in the acoustic cell. After placing the sample, close the sample cell, open the high-purity helium valve, and purge with high-purity helium to remove water vapor and carbon dioxide gas in the photoacoustic cell. Collect mid-infrared photoacoustic spectral information, the collection wavelength range is 4000-400cm -1 , scanning resolution is 4cm -1 ; The moving mirror speed is 0.3162cm -1 s, 32 consecutive scans to take the average spectrum, and ...

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Abstract

The invention provides a rapid detection method for organic matters in soil based on an infrared spectroscopic intelligent identification model. The method comprises the following steps: acquiring a soil sample; acquiring mid-infrared photoacoustic spectral information and carrying out continuous multitime scanning to obtain average spectrum; analyzing the content of organic matters in a soil sample by using a chemical process; preprocessing spectral information; acquiring mid-infrared photoacoustic spectral information of a to-be-detected soil sample; taking average spectrum and carrying out preprocessing; determining the chemical reference value of the to-be-detected soil sample; calculating mahalanobis distance between the to-be-detected soil sample and training samples and establishing a new sequence matrix according to a sequence from smaller distance to bigger distance; establishing a prediction model with different modeling numbers from the new sequence matrix according to the characteristics of the to-be-detected soil sample; and evaluating the parameters of the model, selecting an optimal modeling number and carrying out optimization so as to obtain the intelligent soil identification model. According to the invention, the intelligent identification model according with the spectral characteristics of the spectrum of each sample is established and one model corresponds to one sample, so background interference and variability effect of soil can be effectively reduced; and the intelligent identification model has good universality, is stable and effectively improves prediction accuracy.

Description

technical field [0001] The invention belongs to the field of agricultural informatization, and specifically relates to a fast, accurate and nondestructive determination method for detecting soil organic matter content by establishing an intelligent identification model based on mid-infrared photoacoustic spectroscopy. Background technique [0002] Soil organic matter is an important part of soil and an important indicator of farmland soil fertility and soil quality. Rapid detection of soil organic matter content is of great significance for precise fertilization in farmland. [0003] At present, the traditional determination of soil organic matter content generally adopts potassium dichromate volumetric method, hydration thermal potassium dichromate oxidation-colorimetric method, etc. These methods require pretreatment of samples, complicated operation, high cost, long test period, and It requires a large amount of chemical reagents, is easy to pollute the environment, and i...

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Application Information

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IPC IPC(8): G01N21/3563
CPCG01N21/3563
Inventor 杜昌文马菲周健民
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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