Method for quantitatively measuring spatial structure of soil particulate organic matters

A soil particle and spatial structure technology, applied in the field of soil research, can solve the problems of difficult quantitative measurement, complex structure, random distribution, etc.

Active Publication Date: 2019-07-02
INST OF ANIMAL SCI & VETERINARY MEDICINE SHANDONG ACADEMY OF AGRI SCI
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Problems solved by technology

[0004] However, the distribution of soil particulate organic matter in the soil is random, the structure is complex, and the quantitative determination is relatively difficult. A series of pretreatments and experimental method optimization and improvement are required for soil particulate organic matter. Therefore, no one has applied this method in the present In the determination of the spatial structure of soil granular organic matter, based on the previous research, the inventor first proposed to use micro-CT technology to quantitatively measure the spatial structure characteristics of soil granular organic matter

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  • Method for quantitatively measuring spatial structure of soil particulate organic matters
  • Method for quantitatively measuring spatial structure of soil particulate organic matters
  • Method for quantitatively measuring spatial structure of soil particulate organic matters

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Embodiment 1

[0029] 1. Wet sieving and classifying to extract aggregates in soil

[0030] Collect soil samples from the reed growth area in the coastal wetlands of the Yellow River Delta, accurately weigh 20g of soil samples into a 100mL centrifuge tube, slowly add water to infiltrate, and the water-to-soil ratio is about 2:1. Unstable, the aggregates collapse, destroying its stability. Then invert the centrifuge tube below the water surface in the 2mm sieve (the lower layer of the 2mm sieve is placed in sequence with 250 μm and 53 μm sieves) until the soil sample completely sinks into the sieve. Move the sieve up and down, 3cm / time, 25 times / min. Through wet sieving classification to obtain macro-aggregate samples with a particle size of 250-2 000 μm and micro-aggregate samples with a particle size of 53-250 μm, the granular organic matter is further separated;

[0031] 2. Density extraction method to extract granular organic matter

[0032] With a density of 1.85g / cm 3 Density fracti...

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Abstract

The invention discloses a method for quantitatively measuring the spatial structure of soil particulate organic matters. According to the method, the particulate organic matters in the soil are extracted by means of wet sieving, classification and density extraction; with the micro-CT technology, image scanning is carried out on the particulate organic matters; and artifact removing, threshold calculation, image segmentation, and three-dimensional reconstruction are carried out on the scanned image successively, thereby measuring the soil mechanical morphological characteristics, organic matter quantity, volume ratio, volume distribution, pore size distribution quantitatively. With first utilization of the micro-CT technology, the spatial structure characteristics of soil particulate organic matters are measured quantitatively; and thus the foundation is laid for the deep study of the soil science, especially the soil organic matters.

Description

technical field [0001] The invention relates to a method for quantitatively measuring the spatial structure of soil granular organic matter, belonging to the technical field of soil research. Background technique [0002] Soil particulate organic matter has complex physical structure characteristics. At present, there is no uniform and effective method to directly and quantitatively measure the spatial structure of soil particulate organic matter. Scholars at home and abroad use non-destructive microscopic analysis techniques, such as electron microscopy, scanning electron microscopy-energy spectroscopy (SEM-EDX), and other means to study the surface morphology and chemical composition of soil particulate organic matter. Through these methods, it can be found that the soil particulate organic matter of different sources and degrees of humification shows obvious structural differences under the electron microscope, such as flocculent structure, layered structure, and interlay...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10G01N1/34G01N23/046
CPCG01N1/34G01N15/10G01N23/046
Inventor 刘兴华骆永明章海波谢寅雨朱荣生王诚王怀中黄保华唐茜
Owner INST OF ANIMAL SCI & VETERINARY MEDICINE SHANDONG ACADEMY OF AGRI SCI
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