TEXTURAL AND CHEMICAL PROPERTIES OF TWO DEPTH SOILS IN A TOPOSEQUENCE OF ANAK KRAKATAU BEFORE DECEMBER 2018 ERUPTION

Astriana Rahmi Setiawati, jamalam lumbanraja, Septi Nurul Aini, Dermiyati Dermiyati, Henry Buchari, zuldadan naspendra

Abstract


Anak Krakatau volcano is one of the most famous volcanic mountains located in the sea to the south part of the Province of Lampung, Indonesia. The volcano was derived from the active Krakatau caldera that first appeared on the surface in 1930 or 47 years after the eruption of Krakatau in 1883. The material produced by the Anak Krakatau eruption was very interesting related to soil forming material for research on its physical and chemical properties. The objectives of this study were to present information about the textural and chemical properties of soil from Anak Krakatau Mountain on the southeast slope before the December 2018 eruption at two different depths. Soil samples were taken from a toposequence at seven points with an interval of about 15 m above sea level on the northern slope (approaching northeast) of the Anak Krakatau in July 2018 at depths of 0-20 cm and 20-40 cm. The soil texture of Anak Krakatau mountain before eruption of December 2018 was sandy with the percentage of sand (98.82 - 99.59 %); silt (0 - 0.59 %); and clay (0.41 - 0.74%). The chemical properties of soil Anak Krakatau mountain were: soil pH of H2O (4.95 – 6.27); soil  pH of KCl (4.75 – 5.89); Cation Exchange Capacity (0.41 – 2.02 cmolc kg-1); Base Saturation (117.24 – 514.63 %); CaO (2.63 – 6.34 %); MgO (3.06 – 6.13 %); K2O (0.019 – 0.034 %); Na2O (0.035 – 0.080 %); P-retention (82.10 – 84.74 %); and organic carbon (0.06 – 0.72 %). SEM-EDX Analysis show that the amount of Mg and Na were more than 1 % and there were several trace element in Anak Krakatau soils : Sb (Stibium), Nb (Niobium), Y (Yttrium), F (Flour), Co (Cobalt), and Ba (Barium).

Keywords


Anak Krakatau volcano; soil texture; soil chemical properties

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DOI: http://dx.doi.org/10.5400/jts.2020.v25i2.%25p

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