Evaluation of the impact of freezing technique on pore-structure characteristics of highly decomposed peat using X-ray micro-computed tomography

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2022-08-29 DOI:10.31545/intagr/152057

H. Al Majou, A. Bruand, O. Rozenbaum, E. Le Trong

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Abstract

. The modelling of peatland functioning requires detailed knowledge of the peat structure. To this end, freezing is nowadays increasingly used to obtain X-ray micro comput ed tomography (X-ray -CT) images. The aim of this study was to analyze the structure of a peat material before freezing and post-defreezing using X-ray -CT and to look for possible alter ations in the structure by analyzing the air-filled porosity. A highly decomposed peat material close to water saturation was selected for study. Three samples were analyzed before freezing and post-defreezing using an X-ray -CT Nanotom 180NF. Results showed that the continuity and cross section of the air-filled tubu lar pores several hundreds to about one thousand micrometers in diameter were altered post-defreezing. Many much smaller air-filled pores not detected before freezing were also recorded post-defreezing. Detailed analysis showed a dramatic increase in the number of air-filled pores ranging between 1 voxel (216 10 3 µm 3 ) and 50 voxels (10.8 10 6 µm 3 ) in volume. The volume of these pores newly occupied by air using X-ray -CT and their total volume was found to be consistent with the one calculated as resulting from the increase in the specific volume of water when it turns into ice.

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利用x射线显微计算机断层成像技术评价冻结技术对高度分解泥炭孔隙结构特征的影响

泥炭地功能的建模需要对泥炭结构有详细的了解。为此，冷冻现在越来越多地用于获得X射线显微计算机断层扫描（X-ray-CT）图像。本研究的目的是使用X射线CT分析泥炭材料在冻结前和解冻后的结构，并通过分析充气孔隙率来寻找结构中可能的变化。选择了一种接近水饱和度的高度分解泥炭材料进行研究。三个样品在冷冻前和解冻后使用X-射线CT Nanotom 180NF进行分析。结果表明，直径数百至约1000微米的充气管状孔的连续性和横截面在解冻后发生了改变。冷冻前未检测到的许多小得多的充气孔隙也在解冻后被记录下来。详细分析显示，充气孔隙的数量急剧增加，体积在1个体素（216 10 3µm 3）和50个体素之间（10.8 10 6µm 3。利用X射线CT发现，这些新被空气占据的孔隙的体积及其总体积与水变成冰时比体积增加所计算出的体积一致。

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.