不同林分生物量分配格局受密度影响效应的研究

Study on Effects of Density on Biomass Allocation Pattern in Different Forests

[目的]了解大青山林分的结构和密度对不同林分生物量的响应情况。[方法]采用伐倒样树法和直接收获法,对大青山油松、落叶松人工林和白桦天然次生林的生物量进行测定。[结果]大青山林地总生物量以落叶松林最高,为52 225.4 kg/hm2,其次是油松人工林(34 869.0 kg/hm2)和白桦林(26 378.9 kg/hm2);灌木层以白桦林生物量最大,达到3 251～4 160 kg/hm2;草本层油松林中生物量相对较大,达369.3～1 146.9 kg/hm2,其次为白桦林和落叶松林。25年生落叶松在1050.6～1 700.8株/hm2密度范围内随密度增加其干材生物量所占比例明显增加,30年生油松在密度1 525～3 875株/hm2范围内随密度增加各器官生物量都有增加的趋势。[结论]不同密度对落叶松人工林树枝生物量和草本生物量在0.05水平上有显著影响。

[Objective]This study aimed to analysis the effects of structure and density of the stand in Daqing Mountains on the biomass of various forests. [Method]The biomass of Pinus tabulaeformis, Larix prince rupprecht artificial forest and Betula platyphlla natural secondary forest in Daqing Mountains was measured by methods of cutting the sample tree and direct harvest.[Result] The total biomass of L. prince ruppreeht was the highest （ 52 225.4 kg/hm^2） and that ofP. tabulaeformis （34 869.0 kg/hm^2） and B. platyphlla （26 378.9 kg/hm^2） were secondary. The biomass of shrub layer orB. platyphlla was highest （3 251.6-4160.8 kg/hm^2） and that of grass layer ofP. tabulaeformis （369.3-1 146,9 kg/hm^2） was higher than that of B, platy and L. prince ruppreeht. The trunk biomass proportion of 25 -year-old L. prince rupprecht increased with increment of density within 1 050-1 700 plants/hm^2 and each organ biomass of 30-year-old P. tabulaeformis had increasing trend with increment of density within 1 525-3 875 strains/hm^2, [Conclusion] Different density had significant influence on the brank biomass and herbaceous biomass of L. prince ruppreeht artificial forest and grass layer at 0.05 level.