All information on soils were from the Land Resource Study 20 series of books
(Volumes 1 to 5), published by the Land Resources Division, Ministry of Overseas
Development , UK.
Kinabatangan Association occurs:
the floodplains of rivers throughout the State, with major developments
along the Sugut, Labuk, Kinabatangan, Segama, Merbau, Silabukan and
Kalumpang on the east coast, and
the Mengalong, Papar, Putatan, Tampasuk and Bandau on the west coast.
floods are particularly severe on the major east coast rivers. Similar to Lungmanis
Association occurring on valley floors.
majority of the association is covered with varieties of riverine dipterocarp
forest and swamp forests which, in general, are poor with canopy heights of less
than 30 to 36 m. Examples include a rather poor swamp dipterocarp forest with Shorea
leprosula and Dipterocarpus applanatus in the upper canopy and
an abundance of Syzygium sp., Diospyros sp. and Annonaceae in the
understorey. A rather open Alstonia swamp forest with other species
present, including Parkia sp. and Glochidion sp.; a mixed swamp
forest of Syzygium and Diospyros sp. and a swamp forest with Nauclea
sp. and Dipspyros sp.
of secondary forest included secondary swamp associations of Glochidion
with Pandanus described as rather open grassy forest with abundant
climbers; open secondary forest with scattered large trees (e.g. Neesia),
abundant rotan and climbers; and low-thicket secondary forest with Pternandra
and Glochidion and abundant climbers.
Kinabatangan Association consists of generally poorly drained soils which are
liable to severe flooding. No long-term development should
be considered until effective flood control measures have been taken.
These soils are strongly acid with pH normally less than 5.