Komposisi Flora dan Keragaman Tumbuhan di Hutan Rawa Musiman, Rimbo Tujuh Danau Riau

Abstract

Freshwater swamp forest is the most productive ecosystem and plays an important role in the ecological system. The aimed of this study was to analyze structure, composition, plant diversity and to identify the important abiotic environment factors influencing plant diversity on seasonal Tujuh Danau Swamp Forest, Riau. This study was carried out with the quadrat plot methods. In total 200 plots were laid on 1,000 ha area. The result revealed that 97 species of 36 families were identified in the study site. Seedlings and trees contained greater numbers of individuals than saplings and poles levels. Sterculia gilva Mig. was the dominant species in all (seedling, sapling, poles, trees) level. The dominant family in all growth levels were Euphorbiaceae and Dipterocarpaceae. Tree diameters class distribution was a reverse "J" curve indicating the forest in a normal condition. Shannon-Wienner diversity index were high at the extent of 3.08-3.29. Species distribution base on Evenness index showed that the distribution of species was unequal on seasonal swamp forest community. Soil properties of silt, sand, clay and canopy cover were the important abiotic factors influencing the diversity of seedlings on the seasonal swamp forest.