Struktur Komunitas Tumbuhan Dan Faktor Lingkungan Di Lahan Kritis, Imogiri YOGYAKARTA (Community Structure of Plant and Environmental Factor in Critical Land, Imogiri YOGYAKARTA)

摘要

The purpose of this research was to study the community structure of plant at different growth-forms in response to the activities of the local community (people) and the physico-chemical characteristics of soil in the critical land of Imogiri. The research methods employed random quadrat with plot size of 1 x 1, 5 x 5, 10 x 10 m. The placement of the plot followed stratified random sampling. At each plot, species richness, density, dominance, frequency of species, importance values were calculated. The grouping of growth-forms was analyzed using Ordination Analysis and t-test was used to find out the significance of physico-chemical characteristics of the soil. The finding suggested that 303 species could be found in Imogiri, consisting of 34 trees, 62 saplings, and 207 seedlings. Based on the calcultation of the species abundance, it could be concluded that there was an unequal pattern of vegetation communities at the level of trees, saplings, and seedlings/ shrubs. At the level of tree, grouping could be found. Meanwhile at the level of tree, sapling and seedlings tend to show one group (clumped). The tree and sapling of Dalbergia sisso and the shrub of Euphatorium inulifolium showed high dominance and responded the critical land very well hence they could be found in almost in all locations. The abundance of tree species was highly influenced by people\u27s activities and organic minerals that occur in the area. Hence, most of trees had high economical value. Meanwhile, the presence of species at the level of sapling and seedling responded the occuring soil-nutrients.