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Physicochemical grading method for granular soil components

A technology of soil particles and grading methods, which is applied in the research on the dynamic function of fertility and the field of soil carbon sink function, can solve the problems of single soil sieve separation, cumbersome methods, and poor combination of soil functions, so as to save medicine, easy to operate, and achieve great results Effect

Inactive Publication Date: 2014-07-02
NORTHEAST FORESTRY UNIVERSITY +2
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Problems solved by technology

[0004] The methods that have been invented so far are mostly single soil sieve separation and conventional water-stable aggregate separation methods, which are cumbersome and poorly combined with soil functions

Method used

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  • Physicochemical grading method for granular soil components

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Embodiment Construction

[0024] The present invention will be further illustrated by examples, but it is not limited to any one of these examples or similar examples.

[0025] 1. Soil sample: 30g air-dried soil sample (<2mm)

[0026] 2. Ultrasonic crushing: Put the soil sample into a beaker, add 150ml of water, and crush it with an ultrasonic crusher for 1 minute to reach 22J ml -1 energy.

[0027] 3. Sieving and separating: the above soil turbid liquid is passed through a 63 μm (240 mesh) soil sieve, wet sieved until the sieved water is clear, and slowly add water to judge with a washing bottle; the soil in the sieve is > 63 μm, and the soil under the sieve is < 63 μm.

[0028] 4. 0.45μm suction filtration: the above <63μm soil turbid solution, centrifuge (3500r / min, 15min), the supernatant is suction filtered under a 0.45μm filter membrane, the filtrate is the soluble soil component, measure the volume, record; accurately weigh 10ml Freeze-drying tube, record; Measure 5ml soluble soil solution int...

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Abstract

The invention provides a physicochemical grading method for granular soil components. The method comprises the following steps: adding distilled water into an air-dried soil sample and carrying out ultrasonic quantitative auxiliary dispersion by using an ultrasonic crusher; then carrying out wet sieving by using a soil sieve with an aperture of 63 mu m so as to divide soil into two parts; subjecting soil on the sieve to density grading with NaI so as to obtain a granular soil component, sand and an aggregate soil component; and subjecting a turbid liquid of soil below the sieve to centrifugation, then subjecting an obtained supernatant to vacuum pumping filtration with a 0.45-micrometer filter membrane, allowing a filtrate to undergo freeze-drying so as to obtain a soluble soil component and oxidizing aleuritic clay with a particle size of more than 0.45 mu m obtained after pumping filtration with sodium hypochlorite so as to obtain an acid-insoluble soil component, wherein the difference between the aleuritic clay and the acid-insoluble soil component is an easily-oxidizable soil component, and so grading of the above-mentioned five soil components is finished. The obtained soil components can be used for determination of related physical and chemical properties like carbon and nutrients of soil. Recycling of NaI is realized through active carbon adsorption and filter paper filtration.

Description

Technical field: [0001] The invention adopts physical and chemical methods to separate soil components, and is mainly used for related research on soil carbon sink function and fertility dynamic function. Background technique: [0002] Soil fertility is the basis for crop production and vegetation growth, and also the basis for maintaining food security for more than 6 billion people around the world. The composition of different particles directly determines the texture and structure of soil, and the distribution of soil nutrients on different soil particles and soil colloidal particles directly affects the persistence and effectiveness of soil fertility. The study of soil fertility and its distribution on different soil particle compositions has always been the focus of scientists from all over the world. [0003] The difference in the composition of soil particles and the distribution of organic carbon in it directly affects the time of soil carbon turnover and the stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/38
Inventor 王文杰汲常萍王慧梅仲召亮武燕李艳红王琼
Owner NORTHEAST FORESTRY UNIVERSITY
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