A Review of Geophysical Methods for Soil Structure Characterization. (3rd December 2018)

• Record Type: Journal Article
• Authors: Romero‐Ruiz, Alejandro; Linde, Niklas; Keller, Thomas; Or, Dani
• Is Part Of: Reviews of geophysics. Volume 56:Number 4(2018)
• Page Start: 672
• Page End: 697
• Publication Date: 2018-12-03
• Subjects: soil structure -- hydro‐ecological function -- geophysics -- petrophysics -- pedophysics; Geophysics -- Periodicals; 550.5
• DOI: 10.1029/2018RG000611
• Languages: English
• ISSNs: 8755-1209

Abstract

Abstract: The growing interest in the maintenance of favorable soil structure is largely motivated by its central role in plant growth, soil ecological functioning, and impacts on surface water and energy fluxes. Soil structure pertains to the spatial arrangement of voids and solid constituents, their aggregation, and mechanical state. As a fragile product of soil biological activity that includes invisible ingredients (mechanical and ecological states), soil structure is difficult to define rigorously, and measurements of relevant metrics often rely on core samples or on episodic point measurements. The presence of soil structure has not yet been explicitly incorporated in climate and Earth systems models, partially due to incomplete methodological means to characterize it at relevant scales and to parameterize it in spatially extensive models. We seek to review the potential of harnessing geophysical methods to fill the scale gap in characterization of soil structure directly (via impact of soil pores, transport, and mechanical properties on geophysical signals) or indirectly by measurement of surrogate variables (wetness and rates of drainage). We review basic aspects of soil structure and challenges of characterization across spatial and temporal scales and how geophysical methods could be used for the task. Additionally, we propose the use of geophysical models, inversion techniques, and combination of geophysical methods for extracting soil structure information at previously unexplored spatial and temporal scales. Key Points: Geophysical methods offer new opportunities for soil structure characterization at larger spatial and temporal scales Combinations of geophysical methods expand the range of quantifiable soil structural attributes from pores to mechanical properties Geophysical methods can capitalize on surrogate dynamic hydrological variables as integrative indicators for soil structure at field scales