STRUKTUR DAN KOMPOSISI VEGETASI RIPARIAN SUNGAI PAGER KECAMATAN RAKUMPIT KOTA PALANGKA RAYA Structure and Composition of Pager River Riparian Vegetation In Rakumpit District, Palangka Raya City

Setiarno*, Santosa Yulianto dan Sandri Wittu

Abstract

ABSTRACT
Riparian vegetation is easily distracted natural resource due to mankind activities. This study attempts to
examine the species composition, the stand structure, and the species diversity of riparian vegetation on Pager
River, Rakumpit district, Palangka Raya. The vegetation data were collected through path combination method with
gridline. We find out that the plant diversity of all types of growth is 28 species with 16 families. The number of
species on station I (upstream) are 13 species with 7 families, while the species having the highest INP is Galam
Tikus (Syzygium zeylanicum (L) DC). There are 19 species with 11 families on station II (middle) in which Resak
(Vatica rassak) has the highest INP. Meanwhile on station III, there are recorded 16 species with 11 families where
the most dominating species is Balawan (Tristaniopsis stellata Ridl.). The spread of tree diameter of riparian
vegetation on Pager river (upstream, middle, downstream) suggests the pattern of reversed "J". Of the upstream
riparian, the species diversity values of all types of growth sit on the low category. Of the middle and downstream
riparian, the diversity values are both low at the seedling and sapling level.Meanwhile, those values are in medium
categories at the pole and tree level. The species richness generally corresponds to the low category whereas the
species evenness corresponds to the high category.
Keywords: Diversity index, species composition, structure, riparian vegetation