Hydric properties of high charge, halloysitic clay soils from the tropical South Pacific region

Pochet, Grégoire; Velde, Marijn van der; Vanclooster, Marnik; Delvaux, Bruno

doi:10.1016/j.geoderma.2006.10.019

Cited by 13 publications

(6 citation statements)

References 28 publications

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“…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: 64%

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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Section: Resultssupporting

confidence: 64%

Predicting and mapping soil available water capacity in Korea

Hong

Minasny

Han

et al. 2013

PeerJ

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“…For comparison, Chorover and Sposito (1995) measured very low CEC values of soil kaolinites from moist tropical forest with b5 cmol c /kg, while Pochet et al (2007) report halloysites from moist tropical soils with CEC from 20-45 cmol c /kg. Factors that contribute to higher CEC of kaolin include octahedral Fe and tetrahedral Al.…”

Section: Tem-aem Analysismentioning

confidence: 99%

The temporal evolution of pedogenic Fe–smectite to Fe–kaolin via interstratified kaolin–smectite in a moist tropical soil chronosequence

2009

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“…-saturated resins without any previous H 2 O 2 oxidation of organic matter (Rouiller et al 1972;Bartoli et al 1991). This procedure is known for its great efficiency to disperse strongly microaggregated soils such as Andosols, Nitisols and Ferralsols (Bartoli et al 1991;Delvaux et al 1992;Pochet et al 2007). Briefly, sand fractions were separated after ultrasonic dispersion of fine earth fraction (\2 mm) and repeated wet sieving.…”

Section: Soil Materialsmentioning

confidence: 99%

The reserve of weatherable primary silicates impacts the accumulation of biogenic silicon in volcanic ash soils

et al. 2008

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Banana plantlets (Musa acuminata cv Grande Naine) cultivated in hydroponics take up silicon proportionally to the concentration of Si in the nutrient solution (0-1.66 mM Si). Here we study the Si status of banana plantlets grown under controlled greenhouse conditions on five soils developed from andesitic volcanic ash, but differing in weathering stage. The mineralogical composition of soils was inferred from X-ray diffraction, elemental analysis and selective chemical/mineralogical extractions. With increasing weathering, the content of weatherable primary minerals decreased. Conversely, clay content increased and stable secondary minerals were increasingly dominant: gibbsite, Fe oxides, allophane, halloysite and kaolinite. The contents of biogenic Si in plant and soil were governed by the reserve of weatherable primary minerals. The largest concentrations of biogenic Si in plant (6.9-7 g kg -1 ) and soil (50-58 g kg -1 ) occurred in the least weathered soils, where total Si content was above 225 g kg -1 . The lowest contents of biogenic Si in plant (2.8-4.3 g kg -1 ) and soil (8-31 g kg -1 ) occurred in the most weathered desilicated soils enriched with secondary oxides and clay minerals. Our data imply that soil weathering stage directly impacted the soil-to-plant transfer of silicon, and thereby the stock of biogenic Si in a soil-plant system involving a Si-accumulating plant. They further imply that soil type can influence the silicon soilplant cycle and its hydrological output.

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Hydric properties of high charge, halloysitic clay soils from the tropical South Pacific region

Cited by 13 publications

References 28 publications

Predicting and mapping soil available water capacity in Korea

Predicting and mapping soil available water capacity in Korea

The temporal evolution of pedogenic Fe–smectite to Fe–kaolin via interstratified kaolin–smectite in a moist tropical soil chronosequence

The reserve of weatherable primary silicates impacts the accumulation of biogenic silicon in volcanic ash soils

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