Geophysical In-situ Groundwater and Soil Monitoring

König, F.; Knödel, Klaus; Mittenzwey, K.‐H.; Weidelt, Peter

doi:10.1007/978-3-540-74671-3_14

Cited by 2 publications

(2 citation statements)

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“…The measured resistivity is a function of water content of the substrate (rock or soil), the chemical composition of pore water and the soil surface area/grain particle size distribution. The relations of these variables are summarized in Archie's law, an empirical equation of resistivity, ρ ( m −1 ), of rocks (König et al, 2007):…”

Section: Principles Of Ertmentioning

confidence: 99%

Technical note: Application of geophysical tools for tree root studies in forest ecosystems in complex soils

et al. 2017

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Abstract. While semiarid forests frequently colonize rocky substrates, knowledge is scarce on how roots garner resources in these extreme habitats. The Sierra San Miguelito Volcanic Complex in central Mexico exhibits shallow soils and impermeable rhyolitic-rock outcrops, which impede water movement and root placement beyond the soil matrix. However, rock fractures, exfoliated rocks and soil pockets potentially permit downward water percolation and root growth. With ground-penetrating radar (GPR) and electrical resistivity tomography (ERT), two geophysical methods advocated by Jayawickreme et al. (2014) to advance root ecology, we advanced in the method development studying root and water distribution in shallow rocky soils and rock fractures in a semiarid forest. We calibrated geophysical images with in situ root measurements, and then extrapolated root distribution over larger areas. Using GPR shielded antennas, we identified both fine and coarse pine and oak roots from 0.6 to 7.5 cm diameter at different depths into either soil or rock fractures. We also detected, trees anchoring their trunks using coarse roots underneath rock outcroppings. With ERT, we tracked monthly changes in humidity at the soil–bedrock interface, which clearly explained spatial root distribution of both tree species. Geophysical methods have enormous potential in elucidating root ecology. More interdisciplinary research could advance our understanding in belowground ecological niche functions and their role in forest ecohydrology and productivity.

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Section: Principles Of Ertmentioning

confidence: 99%

Technical note: Application of geophysical tools for tree root studies in forest ecosystems in complex soils

et al. 2017

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mentioning

confidence: 99%

Application of geophysical tools for tree root studies in forest ecosystems in complex soils

Rodríguez‐Robles¹,

Arredondo²,

Huber-Sannwald³

et al. 2017

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<p><strong>Abstract.</strong> While semiarid forests frequently colonize rocky substrates, knowledge is scarce on how roots garner resources in these extreme habitats. The Sierra San Miguelito Volcanic Complex in Central Mexico exhibits shallow soils and impermeable rhyolitic-rock outcrops, which impede water movement and root placement beyond the soil matrix. However, rock fractures, exfoliations, and soil pockets potentially permit downward percolation and root growth. With ground penetrating radar (GPR) and electrical resistivity tomography (ERT), two geophysical methods advocated by Jayawickreme et al. (2014) to advance root ecology, we studied root and water distribution in shallow-rocky-soils and rock fractures in a semiarid forest. We calibrated geophysical images with in-situ root measurements, and then extrapolated root distribution over larger areas. With GPR, we identified fine and coarse pine and oak roots with 6 to 75&#8201;mm diameters at differential depths in soil and fractures; besides, trees anchored their trunks with coarse roots underneath rock outcroppings. With ETR, we tracked monthly changes in humidity at the soil/bedrock interface, which clearly explained spatial root distribution of both tree species. Geophysical methods have enormous potential in elucidating root ecology. More interdisciplinary research could advance our understanding in belowground ecological niche functions and their role in forest ecohydrology and productivity.</p>

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Geophysical In-situ Groundwater and Soil Monitoring

Cited by 2 publications

References 3 publications

Technical note: Application of geophysical tools for tree root studies in forest ecosystems in complex soils

Technical note: Application of geophysical tools for tree root studies in forest ecosystems in complex soils

Application of geophysical tools for tree root studies in forest ecosystems in complex soils

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