Andosols of Terceira, Azores: measurement and significance of soil hydraulic properties

Fontes, J. C.; Gonçalves, M. C.; Pereira, Luís S.

doi:10.1016/j.catena.2003.10.008

Cited by 30 publications

(18 citation statements)

References 10 publications

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“…The moisture release curve of the organic horizon of the hillslope soils depicted an exponential decrease in soil moisture as matric potentials increased from saturation to ~330 cm H 2 O (Figure a), resembling the soil moisture retention curve of peat soils (Schwärzel et al, ) and those obtained for Andosol soils in the Terceira Island, Portugal (Fontes, Gonçalves, & Pereira, ). The water retention curve of the mineral horizon resembled that of the organic horizon at potential values above field capacity, but with lower moisture contents for the same potentials (Figure b).…”

Section: Resultssupporting

confidence: 69%

Water transport and tracer mixing in volcanic ash soils at a tropical hillslope: A wet layered sloping sponge

Mosquera

Crespo

Breuer

et al. 2020

Hydrological Processes

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Andosol soils formed in volcanic ash provide key hydrological services in montane environments. To unravel the subsurface water transport and tracer mixing in these soils we conducted a detailed characterization of soil properties and analyzed a 3-year data set of sub-hourly hydrometric and weekly stable isotope data collected at three locations along a steep hillslope. A weakly developed (52-61 cm depth), highly organic andic (Ah) horizon overlaying a mineral (C) horizon was identified, both showing relatively similar properties and subsurface flow dynamics along the hillslope. Soil moisture observations in the Ah horizon showed a fast responding (few hours) "rooted" layer to a depth of 15 cm, overlying a "perched" layer that remained near saturated year-round.The formation of the latter results from the high organic matter (33-42%) and clay (29-31%) content of the Ah horizon and an abrupt hydraulic conductivity reduction in this layer with respect to the rooted layer above. Isotopic signatures revealed that water resides within this soil horizon for short periods, both at the rooted (2 weeks) and perched (4 weeks) layer. A fast soil moisture reaction during rainfall events was also observed in the C horizon, with response times similar to those in the rooted layer. These results indicate that despite the perched layer, which helps sustain the water storage of the soil, a fast vertical mobilization of water through the entire soil profile occurs during rainfall events. The latter being the result of the fast transmissivity of hydraulic potentials through the porous matrix of the Andosols, as evidenced by the exponential shape of the water retention curves of the subsequent horizons. These findings demonstrate that the hydrological behavior of volcanic ash soils resembles that of a "layered sponge," in which vertical flow paths dominate. K E Y W O R D S Andosol/andisol, hillslope hydrology, soil moisture, stable isotopes, subsurface flow path, transit time, tropical alpine (Páramo), vadose/unsaturated zone

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Section: Resultssupporting

confidence: 69%

Water transport and tracer mixing in volcanic ash soils at a tropical hillslope: A wet layered sloping sponge

Mosquera

Crespo

Breuer

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…They also have the highest volumetric water content at field capacity (mean 56%), and the volumetric water content at wilting point (mean 27%). This pattern of high water retention is also observed by Fontes, Gonçalves & Pereira (2004) and Pochet et al (2007). As indicated by Shoji et al (1996), one of the special characteristics of Andisols is their high water-holding capacity at −1500 kPa.…”

Section: Resultssupporting

confidence: 62%

Predicting and mapping soil available water capacity in Korea

Hong

Minasny

Han

et al. 2013

PeerJ

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The knowledge on the spatial distribution of soil available water capacity at a regional or national extent is essential, as soil water capacity is a component of the water and energy balances in the terrestrial ecosystem. It controls the evapotranspiration rate, and has a major impact on climate. This paper demonstrates a protocol for mapping soil available water capacity in South Korea at a fine scale using data available from surveys. The procedures combined digital soil mapping technology with the available soil map of 1:25,000. We used the modal profile data from the Taxonomical Classification of Korean Soils. The data consist of profile description along with physical and chemical analysis for the modal profiles of the 380 soil series. However not all soil samples have measured bulk density and water content at −10 and −1500 kPa. Thus they need to be predicted using pedotransfer functions. Furthermore, water content at −10 kPa was measured using ground samples. Thus a correction factor is derived to take into account the effect of bulk density. Results showed that Andisols has the highest mean water storage capacity, followed by Entisols and Inceptisols which have loamy texture. The lowest water retention is Entisols which are dominated by sandy materials. Profile available water capacity to a depth of 1 m was calculated and mapped for Korea. The western part of the country shows higher available water capacity than the eastern part which is mountainous and has shallower soils. The highest water storage capacity soils are the Ultisols and Alfisols (mean of 206 and 205 mm, respectively). Validation of the maps showed promising results. The map produced can be used as an indication of soil physical quality of Korean soils.

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“…Due to their volcanic heritage, these soils are naturally enriched with a high range of trace metals (Doelsch et al, 2006;Parelho et al, 2014). In addition, allophanic ash volcanic soils are recognized for their abundance of neoformed amorphous aluminosilicates (such as allophane and imogolite) and organo-mineral compounds (Fontes et al, 2004), that confer unusual properties to soils, such as a very high binding capacity for metals (Sugiyarto, 2013). In the case of volcanic soils intensively exploited for agricultural purposes, the scenario is particularly aggravated, since the use of agrochemicals (pesticides and fertilizers) can contribute to the accumulation of trace metals in soil matrix, causing even higher negative impacts over the soil ecosystem (Parelho et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Assessing microbial activities in metal contaminated agricultural volcanic soils – An integrative approach

Parelho

Rodrigues

Barreto

et al. 2016

Ecotoxicology and Environmental Safety

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Andosols of Terceira, Azores: measurement and significance of soil hydraulic properties

Cited by 30 publications

References 10 publications

Water transport and tracer mixing in volcanic ash soils at a tropical hillslope: A wet layered sloping sponge

Water transport and tracer mixing in volcanic ash soils at a tropical hillslope: A wet layered sloping sponge

Predicting and mapping soil available water capacity in Korea

Assessing microbial activities in metal contaminated agricultural volcanic soils – An integrative approach

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