福建杉木人工林密度控制图研制及应用

Development and Application of Density Management Diagram for Cunninghamia lanceolata Plantation in Fujian

林分密度管理是通过控制造林时初植株行距以及后继的疏伐管理,对林分密度的控制,进而实现特定的经营目标。为了实现福建杉木人工林密度量化调控,基于Reineke自然稀疏方程,构建福建杉木密度控制图。结果表明:1)构建了杉木人工林最优生长密度上下限以及杉木林分郁闭线;2)构建了杉木优势高模型、杉木材积模型、立地指数模型作为密度控制图的辅助方程;3)基于密度控制图,模拟了3种常见密度下,对杉木林分进行的3种不同经营措施(不进行任何经营措施,合理抚育间伐,对照性抚育间伐),获得不同经营措施下林分总收获量、林分总枯损量、林分年平均收获量等林分参数以及对相应的林分年龄,为合理安排经营密度提供参考。

Stand density management refers to control stand density to achieve specific objective through initial spacing and subsequent thinning. In order to manage the Cunninghamia lanceolata plantation quantitatively, we constructed the stand density management diagram （SDMDs） for C. lanceolata plantation in Fujian Province based on Reineke self-thinning equation. The results were as follows. 1） Constructed the line for up and lower density limit as well as for canopy closure. 2） Developed dominant height model, tree volume model and site index model as the associated relationships for SDMDs. 3） Based on SDMD, modeled 3 different management scenario i. e. , no treatment, an commercial thinning and a pre-commercial thinning for 3 stands with different densities and calculated such stand parameters as the total yield of the final clear cutting, stand mortality, average yield and the corresponding age. Hope the developed SDMD in this study might contribute to the management of C. lanceolata plantation.