燕山山地华北落叶松人工林生物多样性研究

生物多样性与生境因子、林分自身因子、经营措施之间的动态变化规律研究，是开展森林经营的重要基础。通过典型样地调查，运用ForStat2．0统计方法，对燕山山地木兰林管局华北落叶松人工林生物多样性与生境因子、林分因子、经营措施之间相关系数，以及生物多样性各指数随林龄、郁闭度的变化趋势进行系统分析。研究表明：海拔、坡度、坡向、坡位、林龄、密度、郁闭度、混交比是影响该地区物种多样性的重要因子。生物多样性指数随林龄、郁闭度的变化趋势基本符合偏正态分布。据此认为森林经营管理过程中，通过及时调整林分密度，将有利于生物多样性保护，从而提高森林生态系统稳定性。

Study on the biodiversity of planted Larix principis - rupprechtii forest in Yanshan mountainous regions

It is important for developing forest management to study the dynamic change law between biodiversity and factors of habitat,forest stand and management measures.After typical sample investigation,this paper analyzed the correlation coefficients between biodiversity and factors of habitat, forest stand and operational plan, as well as the change tendency of biodiversity indexes based on stand age and canopy density of planted Larix principis - rupprechtii forest in Mulan- weichang Foresty Administration by using statistical method of ForStat 2.0. It indicated that the important factors to influence region biodiversity were altitude, slope, exposure,location, stand age, density, canopy density and mixed proportion. Change tendency of biodiversity indexes based on stand age and canopy density tallied with bias normal distribution. So it was propitious to protect biodiversity and improve stability of forest ecosystem by adjusting forest stand density in time in the course of forest management.