Details
| Original language | English |
|---|---|
| Article number | 105899 |
| Journal | CATENA |
| Volume | 210 |
| Early online date | 1 Dec 2021 |
| Publication status | Published - Mar 2022 |
Abstract
Structure and porous geometry are dynamic soil parameters that control several soil processes and functions. This study details the differences in the structure of typical Oxisols regarding the clay amount, biological activity, and mineralogy. Combining 2D and 3D image analysis can provide detailed information about the soil structure and porous system. The objectives of this study were: (i) to describe the soil microstructure and degree of microaggregation; (ii) to quantify porosity, soil pore types, and soil pore size distribution using 2D and 3D techniques; and (iii) to better understand the relationship between the porous system and the biological, chemical, mineralogical, and physical properties of the soil. The study considered four Oxisols: Xantic Kandiustox (P1), Rhodic Haplustox (P2), Anionic Acrustox (P3), and Typic Hapludox (P4). The results showed that all Oxisols have some degree of microaggregation. The Rhodic Haplustox (P2) had the most pronounced degree of microaggregation, which reflects the greater biological activity and gibbsite/kaolinite ratio, and lower hematite/(hematite + goethite) ratio compared to the other Oxisols. The pore types found by 2D analysis were complex pores in P1 and P2 and rounded pores in P3 and P4. The 3D analysis showed that P2 and P3 have a more connected porous system compared to the other Oxisols, evidenced by the lower value of the Euler number. The best connectivity values of the porous system were congruent to improved saturated hydraulic conductivity measured in a separate sample set.
Keywords
- Micromorphometry, Microstructure, Saturated hydraulic conductivity, Soil mineralogy, X-ray microtomography
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: CATENA, Vol. 210, 105899, 03.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - 2D and 3D techniques to assess the structure and porosity of Oxisols and their correlations with other soil properties
AU - Pessoa, Thaís Nascimento
AU - Cooper, Miguel
AU - Nunes, Márcio Renato
AU - Uteau, Daniel
AU - Peth, Stephan
AU - Vaz, Carlos Manoel Pedro
AU - Libardi, Paulo Leonel
N1 - Funding Information: The authors would like to thank the funding agencies for scholarship CAPES (Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - Finance Code 001) and CNPq (Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - process number: 140126/2017-1). To the agencies Agrisus (Project 2735/19) and FEALQ (Funda??o de Estudos Agr?rios ?Luiz de Queiroz?) for the financial assistance to academic mobility period in Witzenhausen (UniKassel).
PY - 2022/3
Y1 - 2022/3
N2 - Structure and porous geometry are dynamic soil parameters that control several soil processes and functions. This study details the differences in the structure of typical Oxisols regarding the clay amount, biological activity, and mineralogy. Combining 2D and 3D image analysis can provide detailed information about the soil structure and porous system. The objectives of this study were: (i) to describe the soil microstructure and degree of microaggregation; (ii) to quantify porosity, soil pore types, and soil pore size distribution using 2D and 3D techniques; and (iii) to better understand the relationship between the porous system and the biological, chemical, mineralogical, and physical properties of the soil. The study considered four Oxisols: Xantic Kandiustox (P1), Rhodic Haplustox (P2), Anionic Acrustox (P3), and Typic Hapludox (P4). The results showed that all Oxisols have some degree of microaggregation. The Rhodic Haplustox (P2) had the most pronounced degree of microaggregation, which reflects the greater biological activity and gibbsite/kaolinite ratio, and lower hematite/(hematite + goethite) ratio compared to the other Oxisols. The pore types found by 2D analysis were complex pores in P1 and P2 and rounded pores in P3 and P4. The 3D analysis showed that P2 and P3 have a more connected porous system compared to the other Oxisols, evidenced by the lower value of the Euler number. The best connectivity values of the porous system were congruent to improved saturated hydraulic conductivity measured in a separate sample set.
AB - Structure and porous geometry are dynamic soil parameters that control several soil processes and functions. This study details the differences in the structure of typical Oxisols regarding the clay amount, biological activity, and mineralogy. Combining 2D and 3D image analysis can provide detailed information about the soil structure and porous system. The objectives of this study were: (i) to describe the soil microstructure and degree of microaggregation; (ii) to quantify porosity, soil pore types, and soil pore size distribution using 2D and 3D techniques; and (iii) to better understand the relationship between the porous system and the biological, chemical, mineralogical, and physical properties of the soil. The study considered four Oxisols: Xantic Kandiustox (P1), Rhodic Haplustox (P2), Anionic Acrustox (P3), and Typic Hapludox (P4). The results showed that all Oxisols have some degree of microaggregation. The Rhodic Haplustox (P2) had the most pronounced degree of microaggregation, which reflects the greater biological activity and gibbsite/kaolinite ratio, and lower hematite/(hematite + goethite) ratio compared to the other Oxisols. The pore types found by 2D analysis were complex pores in P1 and P2 and rounded pores in P3 and P4. The 3D analysis showed that P2 and P3 have a more connected porous system compared to the other Oxisols, evidenced by the lower value of the Euler number. The best connectivity values of the porous system were congruent to improved saturated hydraulic conductivity measured in a separate sample set.
KW - Micromorphometry
KW - Microstructure
KW - Saturated hydraulic conductivity
KW - Soil mineralogy
KW - X-ray microtomography
UR - http://www.scopus.com/inward/record.url?scp=85120328453&partnerID=8YFLogxK
U2 - 10.1016/j.catena.2021.105899
DO - 10.1016/j.catena.2021.105899
M3 - Article
AN - SCOPUS:85120328453
VL - 210
JO - CATENA
JF - CATENA
SN - 0341-8162
M1 - 105899
ER -