混交林生长模型研究进展

A review on growth models of mixed forests

通过对国内外各种混交林生长模型文献的分析研究 ,得出以下结论 :混交林是森林可持续经营的重要的营林体制 .随着混交林面积的增加 ,混交林的经营面临着挑战 .迫切需要研究合适的模型用于混交林的生长预测和经营 .混交林生长模拟的难点主要包括多树种、林分年龄、立地指数和竞争效应的表达等方面 .在这些方面仍需要大量的工作 .混交林生长模型按模型的层次可分为单木模型、径级模型和全林分模型 .其中单木模型最适合于描述受不同树种间个体竞争影响的混交林的生长 ,个体竞争的描述是这类模型的研究重点 .文章最后讨论了混交林生长模型的发展趋势 ,包括单木模型的研究、混合模型的研究。

Multi species forest is an important silvicultural regime for sustainable forest management. With the increasing of the area of mixed forests, mixed forest management is faced with challenges. It is urgent to develop reasonable growth models for prediction and management of mixed forests. The difficulties of mixed forest growth modeling include descriptions of multi species, stand age, site index and competition interaction etc. Much work on these issues is still needed. Three categories of the models, tree level, diameter class level and stand level, are classified according to spatial resolution of growth models. Among them individual tree approaches seem most appropriate to understand stand growth as affected by competition between individuals of different species. Quantification of competition among individuals is of importantce for the model. The future trends including individual tree modelling, hybrid models, three dimensional models, visualization modelling and integration with GIS are discussed.