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Didi Usmadi, Didi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Journal : JURNAL BIOLOGI INDONESIA

 1 
Pengaruh Struktur dan Komposisi Vegetasi dalam Menentukan Nilai Konservasi Kawasan Rehabilitasi di Hutan Wanagama I dan Sekitarnya Purnomo, Danang Wahyu; Usmadi, Didi
JURNAL BIOLOGI INDONESIA Vol 8, No 2 (2012): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v8i2.3048

Abstract

The Effectof 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 thelowest 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 atsapling 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-backedsunbird (Nectarinia jugularis) and insectivorous (Pycnonotus aurigaster and Orthotomus sepium).Keywords: Conservation index, diversity index, density, dominance, composition and structure, Wanagama I Forest
Populasi dan Kesesuaian Habitat Langkap (Arenga obtusifolia Mart.) di Cagar Alam Leuweung Sancang, Jawa Barat Usmadi, Didi; Hikmat, Agus; Witono, Joko Ridho; Prasetyo, Lilik Budi
JURNAL BIOLOGI INDONESIA Vol 11, No 2 (2015): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1307.549 KB) | DOI: 10.14203/jbi.v11i2.2194

Abstract

ABSTRACTThe growth and regeneration of langkap in natural habitat is very fast and has invasive tendencies. The aim of study was to analyze the population and population structure of langkap in Leuweung Sancang Nature Reserve, and build spatial models of habitat suitability langkap in Leuweung Sancang Nature Reserve. Data were collected using a sampling method with a number of plots along the transect line. Langkap has become the dominant species in Leuweung Sancang Nature Reserve on saplings and pole with population structure shows an normally structure population. Analysis of spatial modelling on habitat suitability of langkap through binary logistic regression with independent variables in the form of the Forest Canopy Density (FCD), slope, distance from the river and Normalized Difference Moisture Index (NDMI) has been able to predict habitat suitability of langkap in Leuweung Sancang Nature Reserve, i.e. 61,10% of the Leuweung Sancang Nature Reserve suitable as habitat langkap and 38,90% of the Leuweung Sancang Nature Reserve is not suitable as habitat langkap. Keywords: Langkap, Arenga obtusifolia, habitat suitability, spatial modeling, Leuweung Sancang Nature Reserve. 
POPULASI DAN KESESUAIAN HABITAT LANGKAP (ARENGA OBTUSIFOLIA MART.) DI CAGAR ALAM LEUWEUNG SANCANG, JAWA BARAT Usmadi, Didi; Hikmat, Agus; Witono, Joko Ridho; Prasetyo, Lilik Budi
JURNAL BIOLOGI INDONESIA Vol 11, No 2 (2015): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v11i2.2194

Abstract

ABSTRACTThe growth and regeneration of langkap in natural habitat is very fast and has invasive tendencies. The aim of study was to analyze the population and population structure of langkap in Leuweung Sancang Nature Reserve, and build spatial models of habitat suitability langkap in Leuweung Sancang Nature Reserve. Data were collected using a sampling method with a number of plots along the transect line. Langkap has become the dominant species in Leuweung Sancang Nature Reserve on saplings and pole with population structure shows an normally structure population. Analysis of spatial modelling on habitat suitability of langkap through binary logistic regression with independent variables in the form of the Forest Canopy Density (FCD), slope, distance from the river and Normalized Difference Moisture Index (NDMI) has been able to predict habitat suitability of langkap in Leuweung Sancang Nature Reserve, i.e. 61,10% of the Leuweung Sancang Nature Reserve suitable as habitat langkap and 38,90% of the Leuweung Sancang Nature Reserve is not suitable as habitat langkap. Keywords: Langkap, Arenga obtusifolia, habitat suitability, spatial modeling, Leuweung Sancang Nature Reserve. 
PENGARUH STRUKTUR DAN KOMPOSISI VEGETASI DALAM MENENTUKAN NILAI KONSERVASI KAWASAN REHABILITASI DI HUTAN WANAGAMA I DAN SEKITARNYA Purnomo, Danang Wahyu; Usmadi, Didi
JURNAL BIOLOGI INDONESIA Vol 8, No 2 (2012): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v8i2.3048

Abstract

The Effectof 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 thelowest 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 atsapling 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-backedsunbird (Nectarinia jugularis) and insectivorous (Pycnonotus aurigaster and Orthotomus sepium).Keywords: Conservation index, diversity index, density, dominance, composition and structure, Wanagama I Forest
Co-Authors A.A. Ketut Agung Cahyawan W Agus Hikmat Danang Wahyu Purnomo Djauhar Asikin, Djauhar Joko Ridho Witono LILIK BUDIPRASETYO Yuzammi Yuzammi