EXPERIMENTAL METHOD 1 Location Prosiding INAFOR III 2015 FullIssue low rest

Bogor, 21-22 October 2015 756 category VU A1cd + 2cd ver 2.3.The meaning is bulian population has been degraded more than 20 during 10 years. Customary forest of Mambang is one of the few locations for ironwood habitat and the area must be preserved accordingly. Bulian forest is a relic of the royal gardens Ria Lampor Telapak Libo who entered the tribe clan Bulang Tengah Suku Tengah BTS Tengah MambangBingin Jungut. Preliminary information on the structure of forest stands and history is important to know the process of regeneration and determine appropriate conservation actions. This paper studies the structure of bulian by diameter class distribution and customary forest history of Mambang, Musi Rawas District, South Sumatera Province. 2. EXPERIMENTAL METHOD 2.1 Location Research conducted in the customary forest of Mambang, which is administratively located in the Beliti Jaya 3E village, Muara Kelingi, Musi Rawas in July 2007. Geographically, this forest is located at coordinates 02 5807 South Latitude- 103 1021 East Longitude Figure 1. Figure 1: Research location and habitat condition on customary forest of Mambang, South Sumatera 2.2 Material Materials used in the study are the following: stands of bulian, habitat biotic and abiotic, comprising factors of vegetation, climate and soil. Tools used include measurers, diameter tape, soil drill and machetes. 2.3 Data collection Prior to data collection, field observations took place to see the general spread of bulian in the field. Double plot method used to collect vegetation sampling. Laying sample plots randomly and evenly spread over the forest area Kusmana, 1997 Figure 2. Sample plots were established with the size of 20 m x 20 m with a number of sample plots as many as 10 pieces. The tree is defined as a woody plant that has a stem diameter at breast height dbh ≥ 10 cm Grossman et al., 1998. Both groups, young tree and tree with stem diameter greater than or equal to 10 cm in dbh were measured and recorded. Soil sampling was conducted at the some point in which it is considered to represent and describe the main site soil conditions. Composite soil samples were collected using soil drill. Individual soil was evenly mixed and Bogor, 21-22 October 2015 757 stirred in a plastic bucket and then taken weighing to approximately 1 kg for lab testing. The soil samples of soil is then analysed in Laboratory of Soil, Faculty of Agriculture of Sriwijaya University in Palembang South Sumatera. The forest history was obtained through in depth interviews with respondents who have selected purposively in consideration that the respondents know about the forest history. Figure 2: Laying sample plots of double plots method 2.4 Data analysis Class distribution study is conducted of the structure tree stands. Diameter classes are divided into several classes: class 10-19 cm, 20-29 cm, 30-39 cm, 40-49 cm, 50-59 cm, and 60 cm. The data obtained from the field were analyzed by calculating density value of individual per unit area. The number of individual trees found in each dimeter class range then plotted in two dimensional field: tree distribution of tree diameter classes x-axis and density y-axis Wiharto et al., 2008. The pattern of individual spread trees were analyzed using index formula Morisita Odum, 1971 mentioned as follows: ∑ Where n is the number of sample plots, N is the total number of individu found in the plot and Xi 2 is the square of the number of individu in plot -i. If = 1, then the individual is in random pattern of deployment; if 1, then the dispersal pattern of individuals are clustered; and if 1, then the individual uniform pattern of spread. 3. RESULT AND DISCUSSION 3.1 History of