Tephra stratification of volcanic ash soils in Northern Ecuador

Tonneijck, Femke H.; Hageman, Jos A.; Sevink, J.; Verstraten, J.M.

doi:10.1016/j.geoderma.2007.11.009

Cited by 16 publications

(22 citation statements)

References 27 publications

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“…The data used have been presented by Tonneijck et al . () and Tonneijck & Jongmans (). We discuss only briefly the sampling and laboratory procedures here.…”

Section: Methodsmentioning

confidence: 96%

“…In our model, we varied the thickness of the layers over time to simulate this change in volume during soil formation. At every time‐step we recalculated dry soil bulk density of a layer at depth x and year t with an empirical relation between organic carbon content and dry soil bulk density based on data from the same study area (Tonneijck et al ., , R 2 = 0.98):

^{b} ρ_{normals, normalw} (() x, t) = c_{1} \exp c_{2} f_{normalO normalC} (() x, t),

where c 1 = 0.9 g cm −3 , c 2 = −5.5 and f OC ( x , t ) is the mass fraction of organic carbon g g −1 . Because of the exponential nature of the relation between organic carbon and dry soil bulk density, we assumed that this relation reflects the combined effect of all soil‐forming processes and not only of SOM incorporation.…”

Section: Methodsmentioning

confidence: 99%

“…The timing of the last tephra deposit was estimated by calibrated radiocarbon dating at 2779 cal bc (Tonneijck et al. , ), resulting in ∼4800 years of soil formation. Related to this tephra stratigraphy, the soil contained a current soil, a palaeosol and a second heavily truncated or immature palaeosol, each at least 40‐cm thick.…”

Section: Description Of Study Area and Sitesmentioning

confidence: 96%

“…The soil profile has formed in three tephra deposits of Holocene age (Tonneijck et al. , ) (see Figure ). The timing of the last tephra deposit was estimated by calibrated radiocarbon dating at 2779 cal bc (Tonneijck et al.…”

Section: Description Of Study Area and Sitesmentioning

confidence: 99%

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The effect of change in soil volume on organic matter distribution in a volcanic ash soil

Tonneijck

Velthuis

Bouten

et al. 2016

European J Soil Science

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Volcanic ash soil contains large stocks of organic matter per unit area. A large proportion of organic matter is stored in the subsoil; therefore, a thorough understanding of its vertical distribution is needed to predict the effects of change in climate and land use. Faunal bioturbation is often cited as the dominant process that affects the vertical distribution of organic matter. An additional but often overlooked process is change in the volume of the soil. Such change might affect the vertical distribution of organic matter by changing the position of the soil surface, which can affect the soil-forming processes related to depth, such as weathering, decomposition, bioturbation and rooting. We calculated the change in volume with geochemical mass balance equations, and showed the effect of change in soil volume on the vertical distribution of organic matter using a dynamic model. Then we evaluated the plausibility of the model concept with an independent model for parameter identification and through a model sensitivity analysis. Results show that volume change is a major soil-forming process that determines the vertical distribution of organic matter in volcanic ash soil as the active bioturbation zone moves upwards in response to soil thickening. Highlights• The research addresses how the vertical distribution of organic matter is affected by change in soil volume.• The effect of change in volume on SOM distribution is important in SOM-rich soil and overlooked in models of carbon dynamics. • Soil volume tripled over 4800 years, influencing bioturbation and consequently vertical SOM distribution.• Change in soil volume cannot be disregarded when modelling and interpreting SOM distribution in SOM-rich soil.

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“…The data used have been presented by Tonneijck et al . () and Tonneijck & Jongmans (). We discuss only briefly the sampling and laboratory procedures here.…”

Section: Methodsmentioning

confidence: 96%

^{b} ρ_{normals, normalw} (() x, t) = c_{1} \exp c_{2} f_{normalO normalC} (() x, t),

Section: Methodsmentioning

confidence: 99%

Section: Description Of Study Area and Sitesmentioning

confidence: 96%

Section: Description Of Study Area and Sitesmentioning

confidence: 99%

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The effect of change in soil volume on organic matter distribution in a volcanic ash soil

Tonneijck

Velthuis

Bouten

et al. 2016

European J Soil Science

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“…org). The southern Andes and Patagonia have garnered a fair number of recent tephrochronology studies (e.g., Kilian et al, 2003;Haberzettl et al, 2007;Bertrand et al, 2008;Watt et al, 2011;Daga et al, 2014;Fontijn et al, 2014) while the central Andes (e.g., Breitkreuz et al, 2014) and northern Andes (e.g., Rodbell et al, 2002;Hansen et al, 2003;Le Pennec et al, 2008;Tonneijck et al, 2008) are also becoming better represented in the published literature. Central America, by comparison, has a paucity of recent tephrochronology studies despite its highly volcanic context.…”

Section: Introductionmentioning

confidence: 99%

The cultural nature of tephra: ‘Problematic’ ecofacts and artifacts and the Barú volcano, Panamá

Holmberg

2016

Quaternary International

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a b s t r a c tThis paper presents data from archaeological stratigraphy and lacustrine core samples containing tephra from the Barú volcano in western Panama. The discussion seeks to refine the understanding of medial tephra deposits near Barú in relation to the eruption history indicated by geological, palaeoecological, and archaeological data. A primary goal of this fieldwork is the identification and correlation of tephra from major Barú eruptions encountered in archaeological contexts by their lithology, stratigraphic position, and mineralogy without resorting to geochemical fingerprinting. The intention is to develop a cost efficient and reproducible means of utilizing tephra as a chronostratigraphic marker in archaeological contexts and examine the intersection of human life with volcanic events and dynamic environments. Tephra in archaeological contexts can have ambiguous placement between ecofact and artifact, as is the case with a small number of crude tephra sculptures in my excavated material and that of a seminal prior study. While the research project utilizes visible tephra layers, not cryptotephra, by all means the tephra data prove to be cryptic. Engagement with the imperfection entailed in meshing multidisciplinary data sets and different scientific communities with interests in tephra, particularly in lesser studied regions, is posited as a 'total' view of tephra.

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Delineation of water flow paths in a tropical Andean headwater catchment with deep soils and permeable bedrock

Lahuatte

Mosquera

Páez‐Bimos

et al. 2022

Hydrological Processes

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Traditional hydrometric data combined with environmental tracers such as water stable isotopes contributes to improve the understanding of catchment hydrology. Nevertheless, the application of isotopic tracers in headwater catchments of the tropical Andes with deep soils and permeable parent material influenced by recent volcanism remains limited. In this study, the stable isotopic composition of precipitation, soil water, wetlands, and streamflow was studied to provide insights into the hydrology of a small tropical Andean catchment with deep and permeable volcanic soils, ash layers, and fractured bedrock resulting from Holocene volcanic activity. Although local precipitation forms under isotopic equilibrium conditions, the stable isotopic composition of precipitation is influenced by atmospheric moisture recycling processes. The spatial and temporal variability of isotopic signals and the analysis of inverse transit time proxies (ITTPs) of surface (streamflow) and subsurface (soil and wetlands) waters indicate that vertical flow paths through the deep volcanic ash soils are dominant across the catchment. The strongly damped isotopic composition of these waters points to high soil and wetlands water storage, increasing the transit time or age of stream water in the hydrological system. These findings indicate that water mobilizing through subsurface flow paths–that is, volcanic soils, ash layers, and cracks in the fractured bedrock resulting from Holocene volcanism–is the main contributor to streamflow generation. Comparison with previously published work from Andean catchments and other volcanic areas shows the diversity of hydrological conditions that can be found as a result of pedological and lithological differences shaped by volcanic activity. Therefore, site‐specific strategies may be needed to improve water resources management.

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Tephra stratification of volcanic ash soils in Northern Ecuador

Cited by 16 publications

References 27 publications

The effect of change in soil volume on organic matter distribution in a volcanic ash soil

The effect of change in soil volume on organic matter distribution in a volcanic ash soil

The cultural nature of tephra: ‘Problematic’ ecofacts and artifacts and the Barú volcano, Panamá

Delineation of water flow paths in a tropical Andean headwater catchment with deep soils and permeable bedrock

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