FLORISTIC COMPOSITION AND STRUCTURE OF A PEAT SWAMP FOREST IN THE CONSERVATION AREA OF THE PT NATIONAL SAGO PRIMA, SELAT PANJANG, RIAU, INDONESIA
ABSTRACT: We studied the
floristic composition and structure of the logged-over peat swamp forest in the
PT National Sago Prima of PT Sampoerna Agro Tbk. group for future management of
the conservation area that has been set aside by the company. In January -
February 2012, 25 quadrats of 20 m × 20 m were laid out systematically along a
transect, thus covering a sampled area of 1-ha. The results showed that the
study site was a regenerating and developing secondary peat swamp forests
having high plant species richness. The total number of species recorded was 73
species of 38 families, consisting of 49 species (30 families) of trees (DBH≥
10 cm ), 42 species (24 families) of saplings (H > 1.5 m and DBH < 10 cm)
and 41 species (27 families) of seedlings and under-growth. Tree density was
550 individuals/ha and total tree basal area was 18.32 m 2 . The
Shannon-Wiener’s Diversity Index for trees was high (3.05) Two tree species
with the highest Importance Values (IV) were Pandanus atrocarpus (IV = 45.86 %)
and Blumeodendron subrotundifolium (22.46%). The tree families with the highest
IV were Pandana-ceae (45.86), Myrtaceae (40.37) and Dipterocarpaceae (39.20).
Forest structure dominated by trees with a diameter below 20 cm amounting to
408 trees/ha (74.05%). D and E strata with height of less than 20 m, and
density of 431 trees/ha (78.36%). Jaccard Similarity index among species,
showed strong association between Pandanus atrocarpus and Blumeodendron
subrotundifolium and based on this association combined with high IVs, the two
parameters of species characterized the forest, hence the forest could be
designated as the Pandanus atrocarpus–Blumeodendron subrotundifolium
association. Primary forest species with high economic values were still
present in the forest. Eleven species can be included in the IUCN Red List, of
which Shorea rugosa is in the category of Critically Endangered, Shorea
teysmanniana Endangered and Gonystylus bancanus Vulnerable, hence they should be
protected.
Author: YUSI ROSALINA, KUSWATA
KARTAWINATA, NISYAWATI, ERWIN NURDIN, JATNA SUPRIATNA
Kode Jurnal: jpbiologigg140030
