Abstract:Since the end of the last century, two major changes in forest management policy and strategies have been affecting the sustainability of natural Korea pine (Pinus koraiensis) and broadleaf mixed forest (KBF): implementation of Natural Forest Protection Project (NFPP) and no-cutting Korean pine which was taken as a important timber and logged all the time. However, the post-harvest regeneration has not changed correspondingly. Planting Korean pine is continually the only one way to promote natural regeneration, while broadleaf tree species is ignored in the management systems. In order to explore the effect of current management pattern on the sustainability o KBF, this study evaluated the availabilities of forest resources utilization in typical KBF region. The results showed that the implementation of NFPP has decreased harvesting quota, increased forest unit-area volume and then indirectly promoted KBF restoration. Since Korean pine has not been harvested at around of the end of the last century, four broadleaf tree species, including Tilia amurensis, Quercus mongolica, Fraxinus mandschurica and Ulmus japonica occupied 94.7% of total amount of timber production, however, their growing increase in standing timber in commercial forest are lesser than that of felled lumber, suggesting that the timber resource are getting deficit and not sustainable. While the forest management model "planting coniferous and cutting broadleaf" has gotten the situation worse. In the processing of keeping coniferous tree survival, a large number of broadleaf, the four timber tree species among them, are removed because of probably affecting conifer tree live. As a consequence, broadleaf seedlings and sapling are scarce in stands floor. In general, the two major changes has indirectly caused forest resource restoration and increased the sustainability of KBF in welfare forest area. At mean time, they has consistently increased the dominance of Korean pine in the KBF stands, reduced the capacity of standing timber in commercial forest, and then decreased the sustainable utilization for timber. Out results indicated that the current forest management will tend to rapid depletion of standing timber in KBF distribution area. Therefore, this study suggested that suitable forest management should adapted to forest planning, management targets, stand situations.