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北京松山自然保护区拥有华北地区唯一的天然油松林,通过对松山8块不同林龄天然油松林样地生物量分配格局进行调查,利用RDA分析和方差分解的方法探究环境因子对各器官生物量分配格局的影响,研究发现:(1)乔木层生物量随着林龄增大而增加,40、55、70、95年生林分乔木层生物量分别为116.96、132.31、144.86、170.82 t·hm-2,各器官(根、叶、干材、枝条)生物量随着林龄的增大也呈现增长趋势,但各器官的生物量分配比在各个林龄无明显差异(P>0.05);(2)林龄与乔木层各器官生物量之间两两呈显著线性正相关。(3)环境因子前两个主成分对乔木层、灌木层、草本层生物量分配格局方差解释程度分别为:96.79%、46.04%、86.80%。在乔木层、草本层生物量分配格局的方差解释上,土壤因子模型的独立作用要远大于地形模型,在灌木层生物量分配格局的方差解释上,地形因子模型的独立作用要远大于土壤因子模型。
Beijing Songshan Nature Reserve has the only natural Pinus tabulaeformis forest in North China. Through the investigation of 8 biomass distribution patterns of natural Pinus tabulaeformis forest in Songshan Mountain, the effects of environmental factors on the biomass of each organ were explored using RDA analysis and variance decomposition The results showed that: (1) The biomass of arbor layer increased with the increasing of age, and the arbor biomass of the stands of 40, 55, 70 and 95 years were 116.96, 132.31, 144.86 and 170.82 t · hm -2. The biomass of all organs (roots, leaves, stems and shoots) also increased with the increase of forest age. However, there was no significant difference in biomass allocation among all organs (P> 0.05). (2) There was a significant linear positive correlation between stand length and biomass of all organs of tree layer. (3) The first two principal components of environmental factors explained the variance of biomass distribution pattern of arborous layer, shrub layer and herb layer respectively: 96.79%, 46.04%, 86.80%. In the tree layer, the variance of the biomass distribution pattern of the herb layer explained the independent effect of the soil factor model much more than that of the terrain model. The variance of the biomass distribution pattern of the shrub layer showed that the independent effect of the topographic factor model was much larger than that of the soil factor model.