Since the early 2000s, the community forest management model (CFM) has appeared as a formal form of forest resource management in Vietnam. As a result, there have been many models piloted throughout the country, with the legal framework, policies and approaches have been continuously developing and improving. Therefore, the practical aspects of policy implementation at the community levels need to be further studied and evaluated, in which the estimation of potential timber benefits that will flow to communities is one of priorities. Thus, this study aimed at exploring the problematic issues related to timber benefits of CFM in a case study of central Vietnam, and analyzing the balance between costs of local participation and timber benefits for different time scales by the application of system dynamics. The research findings revealed that seven main sensitive factors are significantly influencing the actual and future net timber benefits of the local communities. Of the seven sensitive factors, the most sensitive factor is timber prices, followed by benefit rates, volume of timber, and breaking fraction. The lowest sensitive factor is harvestable conditions, followed by transaction activities, and harvesting rates. The running results of simulation model in different scenarios indicated that the local communities have to wait 25 years to let the poor reserve forests reach to harvestable conditions in case of actual conditions. It is 15 years and over 50 years in cases of advantage and disadvantage conditions respectively. In combination of poor and medium reserve forests, the total net benefit is positive value after 5 years of implementing CFM for all three conditions, and a big amount after 50 years in cases of actual and advantage conditions, about 607,068 USD and 660,351 USD respectively, while it is only about 52,666 USD in disadvantage conditions. In fact, how to maximize benefits and give chances of getting those benefits to the local communities, it requires the adjustment of polices related to types of forest to be allocated, harvestable conditions and benefit rates. At the same time, the local communities have to put more effort into forest protection and development activities otherwise they will only gain very low benefits from their forests. Moreover, assistance in terms of policies to help the communities realizing the working activities planned as well as technical and financial support in case of poor reserve forests are really needed.
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