Keragaman Struktur Tegakan Hutan Alam Tanah Kering Bekas Tebangan Di Kalimantan

Abstract

Forest is a natural sophisticated ecosystem that its structure and composition differs than neighborhood environments. High market demand on forest product, especially woods, has charge in forest degradation, both quantity and quality. Thus, upcoming prescription of natural forest management should be determined more accurately and efficiently. The future stand potency can be predicted based on current ex felling stand potency through data collected from Permanent Sample Plot (PSP). In that case, it is necessary to discover the diversity of stand structure after logging. Stand structure diversity is foretold by negative exponential formula N = N0 e-kd. The diversity of natural stand structure after logging in Kalimantan island is forecasted through observation at 106 PSP of 39 timber estate unit, presented 9 (nine) possible stand type. In stand structure of Dipterocarpaceae group is found six stand type, that were Type I 21,36% (22 PSP), Type II 27,18% (28 PSP), Type III 16,50% (17 PSP), Type V 2,91% (3 PSP), Type VI 13,59% (14 PSP), and Type IX 18,45% (19 PSP). Meanwhile, 7 (seven) type of stand structure were found in non-Dipterocarpaceae group that were Type I 28,16% (29 PSP), Type II 17,48% (18 PSP), Type III 1,94% (2 PSP), Type V 17,48% (18 PSP), Type VI 9,74% (9 PSP), Type VIII 4,85% (5 PSP), and Type IX 21,36% (22 PSP). Six stand type were found at group of all species that were Type I 25,47% (27 PSP), Type II 22,64% (24 PSP), Type III 3,77% (4 PSP), Type V 15,09% (16 PSP), Type VI 16,98% (18 PSP), and Type IX 16,04% (17 PSP). Those three groups have vary initial number of trees but all endured trees number decreasing by the increasing of diameter class, from slightly slope to highly slope topography. Based on land cover map, some timber estates were discovered located at primary or mature secondary forest, secondary or immature secondary forest, and the rest were at area other than forest, each were 3 HPH (7,69%), 24 HPH (61,54%), and 12 HPH (30,77%), respectively.