Preprints
https://doi.org/10.5194/egusphere-2022-1352
https://doi.org/10.5194/egusphere-2022-1352
07 Feb 2023
 | 07 Feb 2023

How do Microtopography Act in the Pedogenic Characteristics of Mudstone-derived Soils in Hilly Mountainous Regions?

Banglin Luo, Jiangwen Li, Jiahong Tang, Chaofu Wei, and Shouqin Zhong

Abstract. The topography is a critical factor that determines the characteristics of regional soil formation. Small-scale topographic changes are defined as microtopographies. As a characteristic topographic condition in hilly mountainous regions, the redistribution of water and soil materials caused by microtopography is the main factor affecting the spatial heterogeneity of soil and the utilization of land resources. In this study, the influence of microtopography on pedogenesis was investigated using soil samples formed from mudstones with lacustrine facies deposition in the middle of the Sichuan Basin and developed into hill landforms by erosion of flowing water. Soil profiles were sampled along the slopes at the summit, shoulder, backslope, footslope, and toeslope positions. The morphological, physiochemical, and geochemical attributes of profiles were analysed. The results showed that the soil thickness increased significantly with changes in the soil profile configuration from the summit to the toeslope, and the profile configuration changed from A-C to A-B-C. The migration direction of Ca and Na at the summit, backslope, and footslope changed from enrichment to leaching, whereas that of Al, Fe, and Mg changed from leaching to enrichment. At the summit and shoulder of the hillslope, weathered materials are transported away by gravity and surface erosion, and new rocks are often exposed; therefore, the characteristics of soil development is relatively weak. However, in flat areas such as the footslope and toeslope with sufficient water conditions, the long-term contact between water, soil, and sediment leads to further chemical weathering, resulting in highly developed characteristics. Microtopography can affect physicochemical properties, chemical weathering, and redistribution of water and materials, resulting in differences in pedogenic characteristics at different slope positions.

Banglin Luo, Jiangwen Li, Jiahong Tang, Chaofu Wei, and Shouqin Zhong

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2022-1352', gangcai liu, 27 Feb 2023
    • AC1: 'Reply on CC1', Chaofu Wei, 07 Mar 2023
  • CC2: 'Comment on egusphere-2022-1352', Ningxiang Ouyang, 03 Mar 2023
    • AC3: 'Reply on CC2', Chaofu Wei, 07 Mar 2023
  • CC3: 'Comment on egusphere-2022-1352', Youjin Luo, 06 Mar 2023
    • AC2: 'Reply on CC3', Chaofu Wei, 07 Mar 2023
  • RC1: 'Comment on egusphere-2022-1352', Anonymous Referee #1, 14 Apr 2023
    • AC4: 'Reply on RC1', Chaofu Wei, 11 May 2023
  • RC2: 'Comment on egusphere-2022-1352', Anonymous Referee #2, 18 Apr 2023
    • AC5: 'Reply on RC2', Chaofu Wei, 11 May 2023
  • EC1: 'Comment on egusphere-2022-1352', Giacomo Certini, 12 May 2023
    • AC6: 'Reply on EC1', Chaofu Wei, 14 Jun 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2022-1352', gangcai liu, 27 Feb 2023
    • AC1: 'Reply on CC1', Chaofu Wei, 07 Mar 2023
  • CC2: 'Comment on egusphere-2022-1352', Ningxiang Ouyang, 03 Mar 2023
    • AC3: 'Reply on CC2', Chaofu Wei, 07 Mar 2023
  • CC3: 'Comment on egusphere-2022-1352', Youjin Luo, 06 Mar 2023
    • AC2: 'Reply on CC3', Chaofu Wei, 07 Mar 2023
  • RC1: 'Comment on egusphere-2022-1352', Anonymous Referee #1, 14 Apr 2023
    • AC4: 'Reply on RC1', Chaofu Wei, 11 May 2023
  • RC2: 'Comment on egusphere-2022-1352', Anonymous Referee #2, 18 Apr 2023
    • AC5: 'Reply on RC2', Chaofu Wei, 11 May 2023
  • EC1: 'Comment on egusphere-2022-1352', Giacomo Certini, 12 May 2023
    • AC6: 'Reply on EC1', Chaofu Wei, 14 Jun 2023
Banglin Luo, Jiangwen Li, Jiahong Tang, Chaofu Wei, and Shouqin Zhong
Banglin Luo, Jiangwen Li, Jiahong Tang, Chaofu Wei, and Shouqin Zhong

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Short summary
Five soil profiles along the slopes were sampled at the summit, shoulder, backslope, footslope, and toeslope positions on behalf of the microtopography. The morphological characteristics, physiochemistry, and geochemical attributes of the profiles were analysed. Microtopography can affect physicochemical properties, chemical weathering, and redistribution of water and materials, resulting in differences in pedogenic characteristics at different slope positions.