Method for quantifying soil macropore spatial network structure based on CT scanning technology

Abstract

The invention discloses a method for quantifying a soil macropore spatial network structure based on the CT scanning technology. The method comprises the following steps of sample collection, CT scanning, threshold value selection, data enhancement, image cutting and binarization, three-dimensional visualization and three-dimensional quantization analysis. The method has the advantages that a professional undistributed soil sampling instrument is used for sampling, and disturbance in the undistributed soil collecting process is reduced; a CT scanner and professional three-dimensional analysis software are combined, the most proper threshold value cutting method is adopted, and three-dimensional quantifying analysis of the soil macropore spatial structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of agricultural engineering, and in particular relates to a method for quantifying soil macropore space network structure based on CT scanning technology. Background technique [0002] The traditional methods for measuring soil macropores mainly include staining method, slice method, marker breakthrough curve method and soil tension infiltration meter method. These methods generally have problems, mainly focusing on the damage caused to the undisturbed soil and the existence of systematic errors. At present, some researchers in the world have used CT scanning method as a frontier method for the study of soil macroporous spatial network structure, but due to the limitation of scanning cost and sampling cost, this method has not been widely used. There are even fewer applications. In the world, although this method has been applied, the sampling method adopts the artificial excavation method, which is more d...

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Problems solved by technology

These methods generally have problems, mainly focusing on the damage caused to the undisturbed soil and the existence of systematic errors

At present, some researchers in the world have used CT scanning method as a frontier method for the study of soil macroporous spatial network structure, but due to the limitation of scanning cost and sampling cost, this method has not been widely used. There are even fewer applications

In the world, although this method has been applied, the sampling method adopts manual excavation method, which is more disturbing; in terms of 3D visualization and quantification, there are still unresolved problems in the selection of threshold segmentation method and the analysis of pore throats

In addition, although some scholars in China have begun to use CT scanning to study soil macropore structure, they are mainly based on two-dimensional analysis, and have not realized three-dimensional quantitative analysis; in terms of analysis software, they mainly rely on the built-in software of CT scanner or Image Open source software such as J, less professional software such as Avizo

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