Crown defoliation and radial increment among decayed and undecayed Norway spruce trees

IF 2.7 3区 农林科学 Q1 FORESTRY
Povilas Žemaitis, Emilis Armoška
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引用次数: 0

Abstract

Pathogen-caused wood decay is believed to be one of a major cause of decreasing tree vitality and increased susceptibility to external biotic and abiotic damaging agents. Using data collected from twenty decay-affected different maturity Norway spruce (Picea abies (L.) Karst) stands, this study aims to explore the interaction between butt rot and crown defoliation and radial increment as indicators of tree vitality. Study results indicate that vitality decline among butt rot-affected Norway spruce is expressed as a significant reduction in radial increment and considerably greater levels of crown defoliation. Decayed Norway spruce trees were found to have higher crown defoliation than undecayed spruce trees. Additionally, a radial increment reduction in the last five years and the last twenty years of the increment sequence was found when decayed Norway spruce tree growth was compared to undecayed. Severely defoliated trees were observed only among decayed trees, and this made up only 1% of the population, indicating that butt rot acts as a predisposing or inciting factor for the decline of Norway spruce. A stand age-dependent relationship was also found among visually healthy undecayed spruce trees, indicating that spruce trees show signs of increasing defoliation as part of the ageing process. Among decayed Norway spruce, no such relationship was found, indicating changes in the effect-response framework for decayed trees. Naturally, both decayed and undecayed trees showed a negative correlation between the level of crown defoliation experienced and the radial increment for the last five years before increment sequencing.

腐烂和未腐烂挪威云杉树的冠叶脱落和径向增量
病原体引起的木材腐烂被认为是树木活力下降和对外部生物和非生物破坏剂易感性增加的主要原因之一。本研究利用20个受腐朽影响的不同成熟度挪威云杉(Picea abies(L.)Karst)林分的数据,探讨了枯死与树冠落叶和径向增量之间的相互作用,作为树木活力的指标。研究结果表明,受褐腐病影响的挪威云杉的生命力下降表现为径向增量的显著减少和树冠落叶水平的显著增加。研究发现,腐烂的挪威云杉树比未腐烂的云杉树有更高的树冠落叶。此外,当将腐烂的挪威云杉树生长与未腐烂的相比时,发现在过去五年和最后二十年的增量序列中径向增量减少。只有在腐烂的树木中才观察到严重落叶的树木,而这只占种群的1%,这表明屁股腐烂是挪威云杉衰退的一个诱发因素。在视觉健康的未老化云杉树中也发现了林分年龄依赖关系,这表明云杉树在老化过程中表现出落叶增加的迹象。在腐朽的挪威云杉中,没有发现这种关系,这表明腐朽树木的效应-反应框架发生了变化。自然地,在增量排序之前的最后五年里,腐朽和未腐朽的树木都表现出树冠落叶水平与径向增量之间的负相关。
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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
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