祁连山祁连圆柏天然更新障碍机制研究

祁连圆柏是祁连山水源涵养林乔木树种群落组成的建群种之一，主要分布在祁连山海拔2500～3500m的阳坡、半阳坡上，对维护高山、亚高山生态系统平衡和稳定具有不可替代的作用。目前，祁连山祁连圆柏种群天然更新困难，特别是从幼苗向幼树阶段的转化困难。因此，本项目拟在祁连山祁连圆柏集中分布区，通过野外调查、野外播种实验及室内模拟实验，开展祁连圆柏种子传播、自毒作用、种子萌发、幼苗建成-生长-定居过程及其种子萌发、幼苗生长对环境的响应策略等研究，以期找出主要阻碍祁连圆柏天然更新的因子并探明其阻碍发生的原因，揭示祁连圆柏种群的天然更新障碍机制，并提出科学合理的综合保护对策和人工促进天然更新策略，将对祁连圆柏天然林保护及恢复具有重要的指导意义。

The Sabina przewalskii were one of the constructive species in the arbor species community composition of water conservation forest, were mainly distributed in sunny slope and semi-sunny slope at 2500～3500m elevations of Qilian Mountains,that played an irreplaceable role in maintaining the alpine and subalpine ecosystem balance and stability.At present,the natura regeneration ability of Sabina przewalskii was difficulty, especially to young trees from the seedlings.Therefore,the Sabina przewalskii major regions of Qilian Mountains will be selected as research areas to carry out lots of field investigations,field seeding and control trials,the dispersal of seeds,autotoxicity,seed germination,seedling,establishment-grow-settlement and the policy of responding to environment will be researched to understand the impact factores of seed germination and seedling establishment under natural conditions,to reveal the response mechanism for the environmental change and burial depth, and explain the reason for population degradation seedling settlement and extinction. Base on above research results, the natural regeneration barriers of Sabina przewalskii will be revealed,the science rational countermeasures for protecting and artificially promoted natural update strategy will be presented,which has important guidance significance for the protection and vegetation restoration of Sabina przewalskii natural forest.