西天山雪岭云杉林分密度对森林生物量分配格局和异速生长的影响
收稿日期: 2020-07-26
修回日期: 2020-09-01
网络出版日期: 2021-04-25
基金资助
中国科学院战略性先导科技专项(XAD20040400)
Effects of stand density on the biomass allocation and tree height-diameter allometric growth of Picea schrenkiana forest on the northern slope of the western Tianshan Mountains
Received date: 2020-07-26
Revised date: 2020-09-01
Online published: 2021-04-25
雪岭云杉林是新疆天山北坡山地森林中广泛分布的优势种,探讨林分密度对天山雪岭云杉林器官生物量分配格局和树高-胸径异速生长的影响,对于阐明雪岭云杉林生物量在不同环境中的适应具有重要意义。通过分析在不同林分密度（≤300株·hm-2、300~450株·hm-2、450~600株·hm-2、>600株·hm-2）下雪岭云杉林（Picea schrenkiana）的生长特性,研究林分密度对雪岭云杉林器官生物量分配格局及树高-胸径异速生长的影响。结果表明,随着林分密度增加,雪岭云杉林各器官平均生物量均降低;树干和树根生物量占比增加,树枝生物量占比减少,树叶和树皮生物量占比变化不显著;雪岭云杉林树高和胸径均随林分密度的增加而降低。此外,雪岭云杉林树高（H）和胸径（D）间具有显著的异速生长关系,其中树高-胸径（H-D）的最优异速生长方程为：y=2.312 × x0.900（R2=0.761,P<0.01）;随着林分密度增加,雪岭云杉林lgH-lgD呈现出复杂非线性异速生长关系,该关系的显著性受林分密度变化呈现逐渐降低的趋势,这表明林分密度通过雪岭云杉林对生长资源的竞争影响各器官的生长发育。研究结果可为雪岭云杉林的可持续经营与管理提供理论依据和数据支撑。
李宗英,罗庆辉,许仲林 . 西天山雪岭云杉林分密度对森林生物量分配格局和异速生长的影响[J]. 干旱区研究, 2021 , 38(2) : 545 -552 . DOI: 10.13866/j.azr.2021.02.26
Picea schrenkiana is the dominant species widely distributed in the mountain forests on the northern slopes of the Tianshan Mountains. Determining the effects of individual density on the biomass allocation and height-diameter allometric relationship of P. schrenkiana forest is important to clarify the adaptation strategy of P. schrenkiana in different environments. In this paper, the effects of individual density on biomass allocation and the height-diameter allometric relationship of P. schrenkiana forest were studied based on fields investigations of P. schrenkiana forest with different stand densities (<300, 300-450, 450-600, >600 plants·hm-2). The results showed that the average biomass of all biomass components and branches alone decreased in P. schrenkiana forest when stand density increased. However, the biomass proportions of stems and roots increased, whereas the proportions of leaves and bark were stable. Both the height and the diameter at breast height (DBH) of the P. schrenkiana individuals decreased with increased stand density. Additionally, this study found that the relationship y=2.312 × x0.900 can be used to reliably delineate the allometric growth relationship between the height (H) and the DBH (D) of P. schrenkiana individuals (R2=0.761, P<0.01). With the increase in individual density, the relationship between lgH and lgD of P. schrenkiana individuals showed a complex nonlinear allometric growth relationship, and the significance of the relationship gradually reduced with density. This indicates that density had an impact on the resource competition of individuals and affected the growth of organs. The results can be used to inform the sustainable management of P. schrenkiana forest.
Key words： stand density; picea schrenkiana forest; biomass; allometric growth
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