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A soil bulk density and soil technology, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problems of inaccurate soil volume, easy to produce errors, and inability to use stones, etc., to achieve convenient and simple measurement process, improve test accuracy, and easy carrying effect
Inactive Publication Date: 2012-10-10
GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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[0004] The above-mentioned ring knife method, soil drilling method and original soil pipe method are mainly used on soil with tight soil structure, no stones, no thick root system, and thick soil layer. The three methods cannot collect soil clods with complete shapes; and the ring knife method and the soil drilling method need to manually beat the soil, which often changes the compactness of the natural soil and causes the soil volume to deform; in addition, if the soil extraction process Encountering large stones or thick root systems in the soil will damage the ring cutter, soil drill and soil borrowing pipe
Although the digging method, the irregular cave method and the wax sealing method can overcome some of the shortcomings of the ring knife method, the soil drilling method and the original soil borrowing pipe method, it is difficult for the digging method to meet the soil with loose structure and many stones. Dig a standard cube or cuboid soil pit, so there will be errors in calculating the soil volume; in addition, when the digging method encounters mineral soil, the plastic bag filling method is used to measure the soil volume, but it is impossible to visually det
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Embodiment 1
[0026] Embodiment 1: The applicant uses the method of the present invention to measure the soil bulk density of the soil with many rocks and discontinuous soil in the karst area.
[0027] 1. Prepare the experimental equipment:
[0028] Soil shovel, self-sealing bag (thickness on both sides is 0.05mm, width 11cm×length 16cm), miniature vacuum pump PC3025N (Chengdu Xinweicheng Technology Co., Ltd.), 250ml measuring cup (precision 1ml), electronic balance (precision 0.01g), oven ,tweezers.
[0029] 2. Experimental site: Guizhou Huajiang karst plateau ecological comprehensive management experiment demonstration area, where the soil is lime soil developed from carbonate rocks, and the soil thickness is less than 50cm.
[0030] The soil bulk density was measured under two soil conditions at the above-mentioned experimental site:
[0031] Site A: The thickness of the soil layer is ≤20cm, the soil contains more gravel, and the soil structure is relatively loose;
[0032] Site B: 20...
Embodiment 2
[0050] 1) The soil sampling point was selected in the mixed forest of fir and broadleaf in the Arboretum of Nanjing Forestry University. The soil was mountainous red soil; the soil thickness was >50cm, the soil structure was compact, and the stone content was less.
[0051] Remove the litter and humus layer on the upper layer of the soil at the selected site; collect the soil at a distance of 20cm from the ground, and use a soil shovel to dig out a soil block weighing about 100g and put it into a ziplock bag (ziplock bag specifications: double-sided thickness 0.05mm, width 11cm× length 16cm), a total of 30 bags of soil were collected;
[0052] 2) Take the above sample back to the laboratory, and divide 30 bags of soil into 5 parts, marked as A, B, C, D, E, each with 6 bags, numbered A1, A2, A3, A4, A5 , A6; B1, B2, B3, B4, B5, B6; C1, C2, C3, C4, C5, C6; D1, D2, D3, D4, D5, D6; and E1, E2, E3, E4, E5, E6. Use the micro vacuum pump PC3025N to vacuumize the above-mentioned sam...
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Abstract
The invention discloses a method for measuring the soil bulk density. The method comprises the following steps: collecting soil, placing the collected soil into a self-packaging bag and removing air in the self-packaging bag; when the inside of the sealing bag is in a negative pressure state, sealing the self-packaging bag; measuring the volumes of the sealed self-packaging bag and the soil in the sealed self-packaging bag; taking another empty self-packaging bag of which the size is identical with that of the self-packaging bag for accommodating the soil; removing the air in the empty self-sealing bag and measuring the volume of the empty self-packaging bag; sealing the soil in the bag and drying the soil to constant weight to obtain the weight of the soil; and then calculating the bulk density of the soil according to a formula. According to the method disclosed by the invention, the error of the volume of the soil with an irregular shape can be effectively reduced, and thus the test precision of the soil bulk density is improved. In addition, the method is suitable for measuring the bulk density of the soil under special environments (environmental complexity and soil body crushing) and is especially suitable for measuring the bulk density of the soil on discontinuous soil bodies and soil bodies in which more stones and plant root systems exist in the soil, the soil layer thickness is thinner or the soil structure is loose.
Description
technical field [0001] The invention relates to a method for measuring soil bulk density, which belongs to the technical field of measuring soil physical properties in agriculture and forestry. Background technique [0002] Soil bulk density refers to the dry weight of soil (including the volume of soil voids) in the natural state per unit volume. The size of soil bulk density reflects the level of soil structure, air permeability, water permeability and water retention capacity, which has important application significance in agricultural and forestry production. In agricultural and forestry research, especially when evaluating soil fertility and site quality, the measurement of soil bulk density is often involved. [0003] At present, there are ring-knife method for measuring soil bulk density (Guo Guoshuang. Talk about the determination of soil bulk density. Irrigation and Drainage, 1983, 2(2): 39-40; Liu Duosen, Li Weibo. Simple measurement method of soil bulk density a...
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IPC IPC(8): G01N9/02
Inventor 张中峰龚弘娟黄玉清莫凌何成新徐广平曾丹娟
Owner GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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