孑遗植物长苞铁杉林倒木持续更新流形成的系统模拟与实现研究

With the continuous survey，monitoring and research of rare and endangered plant Tsuga longibracteata in Tianbaoyan National Nature Reserve for 10 years，we put forward to do the next study on the implementation and system simulation of the formation of regeneration flow on fallen logs.The studies are as follow：1)Based on the study about autotoxicity of Tsuga longibracteata and the allelopathy effect on its associated tree species，and the effect of wood-rotting fungi on the decomposition of fallen logs，we try to perfect the study of optimum habitat for natural regeneration of Tsuga longibracteata，and provide the reliable guidance for the selection of habitat in the breeding experiment；2)The breeding experiment of regeneration flow will be performed by the corrosive effects of light intensity，water stress and logs'quality in laboratory simulation test，and the seedling establishment of five community sample plots in field simulation test.The studies can be useful for mastering the physical，chemical and biological environments on natural regeneration；3)The simulation of regeneration flow development will be conducted by dynamic method and the established system dynamics model.Based on the analysis of optional environments combination of regeneration flow to natural regeneration of Tsuga longibracteata，we will determinate the influencing mechanism of fallen logs on natural regeneration；4）The field tracking verification on promoting regeneration of fallen logs will address fundamentally the key technologies that long-term puzzle Tsuga longibracteata is difficult to regeneration.

在对天宝岩国家级自然保护区中最重要的植被- - 珍稀濒危植物长苞铁杉（Tsuga longibracteata）连续10年调查、监测和研究基础上，提出进一步开展倒木持续更新流形成的系统模拟与实现研究，包括：①长苞铁杉自毒作用及其与伴生树种的化感效应、木材腐朽菌对倒木分解能力的影响，从而完善对长苞铁杉更新生境条件的研究，为种苗试验的生境选择提供依据。②长苞铁杉更新流的种苗模拟试验，包括室内模拟试验（探讨光强、水分以及倒木特性对长苞铁杉幼苗建立过程的影响）、野外模拟试验（探讨5种不同群落对长苞铁杉幼苗建立过程的影响），从而掌握长苞铁杉更新的物理环境、化学环境与生物环境。③引入系统动力学方法动态模拟倒木更新流的形成过程，确定倒木形成持续更新流并促进森林更新的最佳环境组合，揭示倒木对森林更新影响的内在机理。④倒木促进长苞铁杉更新的野外跟踪验证研究，最终实现从根本上解决长期困扰长苞铁杉更新的关键技术。