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Estimating soil porosity and pore size distribution changes due to wetting-drying cycles by morphometric image analysis
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2020-09-29 , DOI: 10.1016/j.still.2020.104814
Jocenei A.T. de Oliveira , Fabio A.M. Cássaro , Luiz F. Pires

Porous systems such as soils tend to present great complexity when analyzed at the micrometer-scale. Processes such as tillage and repeated wetting and drying (W-D) cycles tend to continuously alter the structure of the soil. X-ray computed microtomography (μCT) is one of the techniques that can be utilized for quantifying changes in the soil micrometer-scale structure. The objective of this study was to analyze the effect of W-D cycles in the soil porous system of core samples submitted to contrasting management practices (conventional tillage – CT, minimum tillage – MT, no-tillage – NT). An algorithm based on the Mercury intrusion porosimetry method (MIP) was utilized for this purpose. An area of secondary forest (F) was used as a reference. The results of the porosity and functionality of the pores showed that the W-D cycles altered the pore distribution in all management systems. MT was the management that showed the most significant changes in the soil physical properties, where the application of W-D cycles caused fractions of transmission pores to become fissures. In CT, a significant reduction of transmission pores was observed, which indicates the effect of harrowing and plowing operations. Our results show that, depending on the management system adopted, the soil will respond differently to the action of W-D cycles with a direct influence on water retention and movement due to the induced changes in the soil porous system.



中文翻译:

通过形态图像分析估算干湿循环导致的土壤孔隙度和孔径分布变化

当在微米级进行分析时,诸如土壤之类的多孔系统往往会表现出极大的复杂性。诸如耕作和反复的干湿循环(WD)等过程往往会不断改变土壤的结构。X射线计算机断层摄影(μCT)是可用于量化土壤微米级结构变化的技术之一。这项研究的目的是分析WD循环对对照对照(常规耕作– CT,最小耕作– MT,免耕– NT)的核心样品的土壤多孔系统的影响。为此,采用了基于水银压入孔隙率法(MIP)的算法。次生林(F)面积用作参考。孔隙率和孔隙度的结果表明,WD循环改变了所有管理系统中的孔隙分布。MT是表现出土壤物理性质最显着变化的管理方式,其中WD循环的应用导致传输孔的一部分变成裂缝。在CT中,观察到传输孔显着减少,这表明耙松和耕作的效果。我们的结果表明,根据所采用的管理系统,土壤对WD循环的反应会有所不同,这直接由于土壤多孔系统的诱导变化而对保水率和运动产生直接影响。WD循环的应用导致传输孔的一部分破裂。在CT中,观察到传输孔显着减少,这表明耙松和耕作的效果。我们的结果表明,根据所采用的管理系统,土壤对WD循环的反应会有所不同,这直接由于土壤多孔系统的诱导变化而对保水率和运动产生直接影响。WD循环的应用导致传输孔的一部分破裂。在CT中,观察到传输孔显着减少,这表明耙松和耕作的效果。我们的结果表明,根据所采用的管理系统,土壤对WD循环的反应会有所不同,这直接由于土壤多孔系统的诱导变化而对保水率和运动产生直接影响。

更新日期:2020-09-29
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