Komposisi dan Keanekaragaman Herba pada Beberapa Tegakan Hutan Sekunder di Kawasan Ekosistem Leuser Desa Telagah Kabupaten Langkat Sumatera Utara

Abstract

The Composition and Diversity of Herbaceous Plants in the series of secondary forests Leuser Ecosystem Telagah Village Langkat Regency North Sumatra had been studied from February to May 2011. For this study an area of 40 x 160 m was settled using purposive sampling with 32 subplot of 1 x 1 m size for each area. The first study area is 5th secondary forest, area II is 10th secondary forest, area II is 20th secondary forest and area IV is 30th secondary forest. There are 54 species of herbs are recorded in the study area belonging to 31 families. From the study site the first area was dominated by Axonopus sp. , the second was dominated by Selaginella biformis, the third was dominated by Leersia hexandra, and the fourth was dominated by Schismatoglottis calyptrata with importance values are 49,467%, 68,934%, 27,112% and 42,472%, respectively. The diversity index of herbs were 2.162, 2.008, 2.840, 2.531 at area I, II, III and IV respectively, while equitability index of herbs were 0.722, 0.695, 0.862, 0.831 at area I, II, III, IV respectively. Similarity index of herbs range from 1.018% to 28.866%, with the highest similarity index is 28.866% that is found between area II and IV.