摘要
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。
Biomass is one of the basic characteristics of forest ecosystems. The allocation patterns and estimation models of biomass are important for evaluating productivity, ecological functions and carbon cycle of forest. A study on the biomass allocation patterns and allometric models of Larix principisrupprechtii was conducted in Mt. Taiyue, Shanxi, China. The results showed that a significant linear relationship existed between the aboveground biomass and belowground biomass （P〈0.001）. Proportions of stemwood, stembark, branch, needle, cone, and root relative to the wholetree biomass were 47.20%, 10.36%, 15.16%, 6.80%, 0.78% and 19.69%, respectively. The vertical distribution of canopy biomass increased gradually from the upper layer （22.70%） to lower layer （29.11%） and middle layer （48.19%）. The proportion of branch biomass increased with the increase of diameter at breast height （DBH）, while it was opposite for the needle biomass. The proportion of root biomass decreased with the decrease of root diameter. The proportion of stump root biomass and coarse root biomass increased with the increase of DBH, while it was opposite for the other roots. There were significant exponential relationships between the component biomass and the parameters （DBH, tree height, age, canopy length） of the trees （P〈0.05）. The allometric models explained more than 90% variations of stemwood, stembark, root and wholetree biomass, and 81.3% and 74.4% variations of branch biomass and needle biomass, respectively. DBH and tree height were reliable predictors for estimating the biomass of L. principisrupprechtii.
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第11期2918-2925,共8页
Chinese Journal of Ecology
基金
林业公益性行业科研专项(201404213)资助
关键词
华北落叶松
生物量分配格局
异速生长模型
Larix principisrupprechtii
biomass allocation pattern
allometric model.
