Recommendation Public Company Pawnshops Branch Office in the Kupang City need to

214 harvesting activities can reduce potentially some functions of tropical peat swamp forest. So, implementation of timber harvesting in tropical peat swamp forest should be improved through best forest management practices and advanced timber harvesting techniques. In this study, measurement and calculation of natural resources in tropical peat swamp forest were done accurately to evaluate implementation of timber harvesting. The study also estimated total biomass and carbon storage in the three conditions of the forest. The objective of the study was to measure and to know changes of natural resources in order to evaluate implementation of timber harvesting in tropical peat swamp forest.

2. Materials and Methods

The study was carried out in forest concession area of PT Diamond Raya Timber in Riau Province, Indonesia. The object of study was focused on three forest conditions: 1 forest area before harvesting as well as primary forest; 2 forest area after harvesting as well as log over area; and 3 degraded forest area. Stand density and species composition was measured in the field by using 8 sampling plots with area 1 ha of each sampling plot. The sampling woods were analized in laboratory by using testing method to know woods chemical and physical characteristics. Biomass and carbon content were estimated by using direct measurement with destructive sampling technique. Those samples were tested and analized by using carbonization method. Then, an allometric equation was produced by using regression method. Forest biomass and carbon stock were divided in two types of vegetation. First was non trees vegetation such as grass, shrubs, and herbs. Second was tree vegetation such as seedlings, saplings, poles, and trees. Total biomass and carbon stock of non tree vegetation in each plot were estimated by using direct measurement with destructive sampling techniques. Total biomass and carbon stock of tree vegetation in each plot were estimated by using allometric equations from Suwarna et.al. [2]. as following: Biomass W = 0,204 DBH 2.393 and Carbon C = 0.087 DBH 2.470 .

3. Results and Discussion

3.1. Forest management and timber harvesting in tropical peat swamp forest

The concession area had total area of 90,956 ha. It was managed by propotional land use and divided into an effective production area 77 and a protected area 23. The peat soil had a high moisture content consisting 898-1042 of fibrik peat and 861-1065 of hemik peat with