Pengaruh Struktur dan Komposisi Vegetasi dalam Menentukan Nilai Konservasi Kawasan Rehabilitasi di Hutan Wanagama I dan Sekitarnya

Abstract

The Effect

of Vegetation Structure and Composition in Determining the Conservation Value of Rehabilitation Area in the Wanagama I Forest and Surroundings. Wanagama I Forest has many types of land use that distinguished by a combination of agroforestry systems. The aim of the research is to determine the conservation value based on the bird diversity in each of the land use types and to understand the effect of vegetation structure and composition on bird diversity. The conservation value was measured using two factors, namely diversity index (H’) and conservation value index (CVI). Bird diversity was estimated using point counts method,
while vegetation structure and composition was observed using systematic nested sampling. The highest H’ and CVI were found at the old growth forest (H’= 2.328, CVI = 2.556) while the
lowest were detected at the bush (H’ = 1.607, CVI = 1.941). Rehabilitation effort significantly increased bird diversity. In accordance, vegetation structure and composition i.e. cover density,
the number of species, dominance, and canopy strata, significantly affected the bird diversity (F = 2.979, P = 0.005). However, canopy strata (B = 0.20, P = 0.001) and density of vegetation at
sapling level (B = 0.12, P = 0.036) were the most significant factors. Dominant species such as Gliricidea sepium and Tectona grandis were causative factors that attracted the olive-backed
sunbird (Nectarinia jugularis) and insectivorous (Pycnonotus aurigaster and Orthotomus sepium).
Keywords: Conservation index, diversity index, density, dominance, composition and structure, Wanagama I Forest