论文部分内容阅读
生物量作为森林生态系统的基本数量特征之一,其分配格局和估算模型对森林生产力、功能评价和碳循环的研究具有重要意义。本文以山西太岳山地区的华北落叶松人工林为研究对象,对其生物量分配格局和异速生长模型进行了分析。结果表明:(1)华北落叶松地上与地下生物量之间呈显著线性相关(P<0.001);去皮树干、树皮、枝、叶、果和根分别占整株生物量的47.20%、10.36%、15.16%、6.80%、0.78%和19.69%;(2)树冠生物量的垂直分布由大到小依次为中层(48.19%)、下层(29.11%)和上层(22.70%);随着径阶的增加,枝生物量的相对分配比例呈上升趋势,叶生物量与之相反;(3)根系生物量分配随着根系直径的减小而降低;根桩生物量和粗根生物量所占比例随着华北落叶松径级的增加而呈上升趋势,其余等级的根系均呈相反趋势;(4)器官生物量与胸径、树高、年龄和树冠长度之间呈显著性指数关系(P<0.05);异速生长模型对去皮树干、树皮、根和整株生物量的解释率均超过了90%,而对枝、叶生物量的解释率相对较低,分别为81.3%和74.4%;基于胸径和树高能实现较好的生物量预测效果。
As one of the basic quantitative characteristics of forest ecosystem, biomass is of great significance for the study of forest productivity, function evaluation and carbon cycle in terms of its distribution pattern and estimation model. In this paper, the Larix principis-rupprechtii plantation in Taiyue Mountain area of Shanxi Province was studied, and its biomass allocation pattern and allometric growth model were analyzed. The results showed that: (1) There was a significant linear correlation between above and below ground biomass of Larix principis-rupprechtii (P <0.001); peeled trunk, bark, branches, leaves, fruits and roots accounted for 47.20% of total biomass, (2) The vertical distribution of canopy biomass from middle to middle (48.19%), lower (29.11%) and upper (22.70%); (2) The diameter distribution of root biomass increased with the increase of diameter, and the relative proportion of branch biomass increased with leaf biomass decreasing. (3) The root biomass allocation decreased with the decrease of root diameter. (4) The correlation between organ biomass and DBH, tree height, age and canopy length showed a significant exponential relationship (P <0.05). Allometric growth models explained over 90% of the total biomass of peeled trunk, bark, root and whole plant, while the interpretation rates of biomass of branches and leaves were relatively low, which were 81.3% and 74.4%; better biomass prediction based on DBH and tree height.