Struktur dan Produktivitas Rerumputan di Kawasan Danau Toba Desa Togu Domu Nauli Kecamatan Dolok Pardamean Kabupaten Simalungun Sumatera Utara

Abstract

The Structure and Productivity of Grasses in Toba Lake Area Togu Domu Nauli Village, Dolok Pardamean Subdistrict, Simalungun Regency, North Sumatra has been studied from March to June 2012. The study site is determined by purposive sampling method and it is divided into three locations based on altitude with 20 plots of 1 x 1 m in size for each area. There are 21 species of grasses that belong to two families found at three study sites. The first area was dominated by Imperata cylindrica, the second was dominated by Leersia hexandra, and the third was dominated by Imperata cylindrica with importance values are 58.408 %, 72.202 %, and 81.316 %, respectively. The diversity index (H’) of grasses are 1.826, 1.432, 1.010 at area I, II, and III, respectively and equitability index (E) of grasses are 0.658, 0.597, 0.519 at area I, II, and III, respectively. The Similarity index of grasses range from 46.91% to 62.56%, with the highest similarity index is 62.56% that is found between area II and III. The productivity of grasses at area I, II, and III were 538.6 g/m2 , 462.91 g/m2 and 280.3 g/m2 .