Tabel Berat Pohon Tegakan Akasia Mangium (Acacia mangium Willd) (Studi Kasus di IUPHHK-HA PT. Bumi Pratama Usaha Jaya Sumatera Selatan)

Abstract

The availability of tools in a Comprehensive Forest Inventory Periodic activities (IHMB) are necessary to speed up the activities and minimize the errors that occur in the measurement. The purpose of this research is composing the tree weight table of Acacia mangium (Acacia mangium Willd) species in IUPHHKHA PT. Bumi Pratama Usaha Jaya. Results of the regression analysis were taken into three categories that can indicate good or bad for an equation is the coefficient of determination ( ), standard error (SE) and count. The model validation can be performed using the aggregation deviation test (SA), the average deviation (SR), the RMSE (Root Mean Square Error), the value of the bias and real difference test conducted with the chi-square test between the alleged weight with the weight of fact table. Based on the results obtained, the equation can be used to infer a tree weight with skin and without skin based on the diameter in IUPHHK-HA Acacia mangium plant area of PT. Bumi Pratama Usaha Jaya each have Bdk = 0,4799 D1,9109 equation for tree weight with skin and Btk = 0,2096 D2,0841 equation for tree weight without skin.