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首页> 外文期刊>South-East European Forestry >The New Natural Distribution Area of Aspen (Populus tremula L.) Marginal Populations in Pasinler in the Erzurum Province, Turkey, and its Stand Characteristics
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The New Natural Distribution Area of Aspen (Populus tremula L.) Marginal Populations in Pasinler in the Erzurum Province, Turkey, and its Stand Characteristics

机译：土耳其埃尔祖鲁姆省Pasinler白杨（Populus tremula L.）边缘种群的新自然分布区及其林分特征

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Background and Purpose: Genetic diversity is the basis for adaptation and survival of tree species under changing environmental conditions, representing the key issue of stability and productivity of forest ecosystems. This paper studies the marginal population characteristics and stand dynamics of aspen tree (Populus tremula L.) in natural, pure and mixed forest stands with Scots pine (Pinus sylvestris L.). These populations were observed on founding sites between Timarli Valley and Timan Plateau located in Pasinler in the Erzurum Province in Turkey. Materials and Methods: Three replicated sample sites were established according to a randomised block design with a spacing of approximately 200 m in altitude starting from 1,890 m, which is the natural distribution area of P. tremula, up to 2,460 m, above which this species can no longer thrive. Timarl? Valley, Pasinler Erzurum Province, which is the area of research, is located enroute to Timan Plateau, where Scots pines form the alpine tree line ranging up to 2,680 m a.s.l. Results: In this context, aspen trees in this region are the second closest tree species to the tree line after Scots pine, which are found in the subalpine and war zones. In addition, as a result of this study, it has been found out that this species, notwithstanding its natural area of occupancy across Turkey, could thrive up to 2,460 m in altitude and extent of occurrence. Conclusions: A new marginal natural population related to aspen has been found in Pasinler in the Erzurum Province, Turkey, which at the same time indicates that the timberline value in the vertical natural distribution of these species should be updated. Aspen trees, which as pioneer trees play a vital role in the rebuilding or restoring of the ecological balance in forests that over time become degraded because of excessive cutting of trees and erroneous silvicultural interventions should be used in the reclamation of broadleaved and mixed forests in a planned manner. Genetic resources that represent marginal and peripheral populations, both within and outside the natural distribution area, should be established and protected.
机译：背景和目的：遗传多样性是树木在不断变化的环境条件下适应和生存的基础，是森林生态系统稳定性和生产力的关键问题。本文研究了天然，纯净和混交林与苏格兰松（Pinus sylvestris L.）的白杨树（Populus tremula L.）的边缘种群特征和林分动态。在位于土耳其埃尔祖鲁姆省Pasinler的Timarli山谷和Timan高原之间的建国地点观察到了这些种群。材料和方法：根据随机区组设计，建立了三个重复的采样点，从海拔1,890 m（海拔2,460 m，即金银花的自然分布区域）开始，海拔约200 m，该物种高于该物种不再繁荣。提玛尔研究区Pasinler Erzurum Province的Valley位于途经Timan Plateau高原的地方，苏格兰松树构成了高达2680 m a.s.l.的高山树线。结果：在这种情况下，该地区的白杨树是仅次于苏格兰松树的第二大树种，仅次于高山和战争地区。此外，作为这项研究的结果，人们发现，尽管该物种在土耳其境内有自然栖息地，但它在海拔和发生范围上仍可以繁衍至2460 m。结论：在土耳其埃尔祖鲁姆省的Pasinler地区发现了一个新的与白杨有关的边缘自然种群，这同时表明这些物种的垂直自然分布的林线值应予更新。作为先锋树的白杨树在重建或恢复森林的生态平衡方面起着至关重要的作用，由于过度砍伐树木和退化的造林干预措施，随着时间的流逝，退化的森林会逐渐退化，应在阔叶混交林的开垦中使用有计划的方式。应当建立和保护代表自然分布区域内外的边缘和外围人口的遗传资源。

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