Soil aggregate analysis method

A soil aggregate and analysis method technology, applied in the field of soil fertility improvement and soil organic matter accumulation, can solve the problems of poor reproducibility, poor accuracy, and long time consumption, and achieve fast scanning speed, high reliability, and good reproducibility Effect

Inactive Publication Date: 2017-02-01
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

It is used to explore the stability mechanism of soil aggregates, and solves the problems of long time-consuming, poor reproducibility, poor accuracy, and lack of analysis of soil aggregate stability from the perspective of mineral stability in the existing physical grouping methods for studying soil aggregates.

Method used

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Embodiment 1

[0032] 1) Screening of soil samples, sample preparation and in situ determination of synchrotron radiation micro-infrared spectroscopy.

[0033] Soil samples were taken from Qiyang Red Soil Long-term Positioning Experiment Station, Hunan Province, Chinese Academy of Agricultural Sciences. First, pass two 100g soil samples through a 300-mesh sieve, put the screened aggregates in a centrifuge tube, and try to preserve the integrity of the soil particles. Secondly, the soil particles were embedded at low temperature (-20 degrees) with distilled water. Then, use a cryostat to perform cryosectioning, cut into 2-5 μm in size, and place the cut samples on LOW-E lenses. Finally, the LOW-E lens was brought to Shanghai Synchrotron Radiation Light Source for synchrotron radiation micro-infrared spectrometry. During the spectrum acquisition process, the parameters were set through the OMNIC software that comes with the instrument, and the spectral data were acquired and saved. The inst...

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Abstract

The invention discloses a soil aggregate analysis method and belongs to the fields of farmland soil fertility improvement and soil organic carbon cycle. The method comprises the steps that a soil sample is acquired firstly; then, soil aggregate screening preprocessing is conducted on the soil sample, and low temperature freezing and slicing are conducted on the screened and preprocessed soil aggregate by using a water embedding method; then the sliced sample is put on a low emissivity glass (LOW-E) lens; finally, a synchrotron radiation infrared microimaging technology is adopted to analyze the frozen and sliced sample in the previous step. The method can accurately and efficiently study a soil aggregate stabilizing mechanism. In addition, when the method studies the soil aggregate stabilizing mechanism, the method has the advantages of being high in scanning speed (<3h), good in reproducibility and capable of exploring soil minerals and organic matter in situ and the like.

Description

technical field [0001] The invention relates to the fields of improving soil fertility and accumulating soil organic matter, in particular to a method for analyzing soil aggregates. Background technique [0002] Aggregates are the basic units of soil structure, and their size, quantity, composition and stability have an important impact on the formation and maintenance of soil structure. Soil aggregate structure is the material basis of soil fertility. More aggregates are one of the signs of soil fertility. The soil structure with more aggregates has higher soil organic matter content and soil physical and chemical indicators. The stability of soil aggregates is the key to evaluating soil structure. and an important indicator of the physical shape of the soil. Therefore, it is particularly important to maintain the stability of soil aggregates, and the exploration of the stability mechanism of soil aggregates is an essential step in the study of aggregate stability. The co...

Claims

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Application Information

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IPC IPC(8): G01N21/3563
CPCG01N21/3563
Inventor 余光辉褚冰杰沈其荣冉炜孙富生刘飞飞
Owner NANJING AGRICULTURAL UNIVERSITY
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