Relationship between clay mineralogy and exchangeable Al in red and yellow soils from the Islands of Okinawa and Java

NURCHOLIS, Mohamad and Tokashiki, Yoshihiro and Oya, Kazuhiro and Shimo, Moritaka and Miyauchi, Nobofumi (1998) Relationship between clay mineralogy and exchangeable Al in red and yellow soils from the Islands of Okinawa and Java. Relationship between clay mineralogy and exchangeable Al in red and yellow soils from the Islands of Okinawa and Java, 36. pp. 411-421. ISSN 1838-675X

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Abstract

Red and yellow soils from tropical regions are generally more mature than their subtropical
counterparts. Most of these soils contain kaolin as the dominant clay mineral. Exchangeable
aluminium (Al) generally balances permanent negative charges and occupies strongly Lidic
exchange sites of the soil clay. The objective of this study was to identify those clayminerals
that are most highly implicated in contributing exchangeable Al to red and yellow soils
collected from the Islands of Okinawa and Java.
All soils exhibited an acid reaction but varied in their exchangeable Al coptent and clay
mineralogy. Clay content was high in all Javan soils but varied in those from Okinawa.
Javan soils were dominated by kaolinite, and Okinawan soils by an association of illite and
halloysite. However, 2:l-2:1:1 intergrades rvere significant components in both the oku
red soils (Okinawa Island) and the Pamagersari red soils (Jara Island). Javan soils were
characterised by a more mature (advanced) state of weathering than those from Okinawa.
The source of exchangeable Al was halloysite in Okinawan soils and 2:I-2:1 :1 intergra.des
in Javan soils.
Ad'ditional heyuord,s: 2:r-2:1:1 intergrade minerals, clay content, halloysite, kaolinite,
weathering process.

Item Type:	Article
Subjek:	G Geography. Anthropology. Recreation > GE Environmental Sciences
Depositing User:	MUHAMMAD NURCHOLIS -
Date Deposited:	31 Jan 2019 07:57
Last Modified:	31 Jan 2019 07:57
URI:	http://eprints.upnyk.ac.id/id/eprint/17935

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