不同林分生物量分配格局受密度影响效应的研究

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。

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

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 rupprecht was the highest(52 225.4 kg/hm2) and that of P.tabulaeformis(34 869.0 kg/hm2) and B.platyphlla(26 378.9 kg/hm2) were secondary.The biomass of shrub layer of B.platyphlla was highest(3 251.6-4160.8 kg/hm2) and that of grass layer of P.tabulaeformis(369.3-1 146.9 kg/hm2) was higher than that of B.platy and L.prince rupprecht.The trunk biomass proportion of 25-year-old L.prince rupprecht increased with increment of density within 1 050-1 700 plants/hm2 and each organ biomass of 30-year-old P.tabulaeformis had increasing trend with increment of density within 1 525-3 875 strains/hm2.Conclusion] Different density had significant influence on the brank biomass and herbaceous biomass of L.prince rupprecht artificial forest and grass layer at 0.05 level.