边缘效应对南洋杉生长动态和气候敏感性的影响

IF 1.1 4区 农林科学 Q3 FORESTRY Tree-Ring Research Pub Date : 2020-01-21 DOI:10.3959/TRR2018-9
Alci Albiero-Júnior, A. Venegas‐González, M. Rodriguez‐Caton, J. M. Oliveira, T. Longhi-Santos, F. Galvão, L. G. Temponi, P. Botosso
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引用次数: 7

摘要

边缘效应是破碎森林自然动态的主要原因;然而,评估树木一生中边缘效应的研究相对较少。通过对树木生长的长期观察,树木生态学有助于更好地理解边缘效应的影响。为了构建我们的解释框架,我们提出了以下假设:(1)靠近森林边缘的树木的生长速度比远离森林边缘的树木低;(2)自然生长在森林边缘的树木的气候敏感性与森林内部的树木不同。本研究在巴西南部进行,在距离森林边缘50 m处采集了21株针叶Araucaria angustifolia,在距离森林边缘4000 m处采集了19株。树木年代学研究按常规程序进行,生长模式采用基础面积增量、快慢生长特定阈值和主成分分析进行评价。54年的分析结果表明,边缘效应使针叶树的直径增长量和木材产量减少了30%。关于气候变率对树木生长的影响,我们观察到边缘效应可能对位于森林边缘的angustifolia的生长对气候的响应施加了强大的压力,使得这些环境中的个体对温度和降雨的变化更敏感,主要是在一年中温暖的时候。因此,我们强调将边缘树木作为历史环境变化和森林破碎化的潜在生物指标的重要性。未来的研究应该在其他森林类型和不同树种(例如先锋与耐阴,乔木与灌木)中进行,以测试我们结果的可靠性,并提供关于这一现象的更有力的结论。
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EDGE EFFECTS MODIFY THE GROWTH DYNAMICS AND CLIMATE SENSITIVITY OF ARAUCARIA ANGUSTIFOLIA TREES
ABSTRACT Edge effects are a major cause of natural dynamics of fragmented forests; however, studies that evaluate edge effects during the lifetime of trees are relatively rare. Through a long-term perspective of tree growth, dendroecology can contribute to a better understanding of the influence of edge effects. In order to frame our interpretation, we raised the following hypotheses: (1) trees located close to a forest edge have lower growth rates compared to trees growing far from edges, and (2) climate sensitivity of trees naturally growing on the forest edge is different from the trees in the interior. This study was conducted in Southern Brazil, where 21 Araucaria angustifolia located 50 m from the edge and 19 individuals located 4000 m from the forest edge were sampled. Dendrochronological study followed the usual procedures and growth patterns were evaluated using basal area increment, specific threshold value of fast and slow growth, and principal components analysis. During the 54 years analyzed, results indicated that the edge effect reduced growth by 30% in diameter increment and wood production of A. angustifolia trees. Regarding the influence of climatic variability on tree growth, we observed that edge effects may exert strong pressure on growth responses to climate in A. angustifolia located on forest edges, making individuals in those environments potentially more sensitive to variations in temperature and rainfall, mainly at warmer times of year. We therefore emphasize the importance of considering edge trees as potential bioindicators of historical environmental changes and forest fragmentation. Future studies should be carried out in other forest types and with different tree species (e.g. pioneer vs. shade-tolerant, trees vs. shrubs) to test the reliability of our results and provide more robust conclusions about this phenomenon.
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来源期刊
Tree-Ring Research
Tree-Ring Research 农林科学-林学
CiteScore
2.40
自引率
12.50%
发文量
15
审稿时长
>36 weeks
期刊介绍: Tree-Ring Research (TRR) is devoted to papers dealing with the growth rings of trees and the applications of tree-ring research in a wide variety of fields, including but not limited to archaeology, geology, ecology, hydrology, climatology, forestry, and botany. Papers involving research results, new techniques of data acquisition or analysis, and regional or subject-oriented reviews or syntheses are considered for publication. Scientific papers usually fall into two main categories. Articles should not exceed 5000 words, or approximately 20 double-spaced typewritten pages, including tables, references, and an abstract of 200 words or fewer. All manuscripts submitted as Articles are reviewed by at least two referees. Research Reports, which are usually reviewed by at least one outside referee, should not exceed 1500 words or include more than two figures. Research Reports address technical developments, describe well-documented but preliminary research results, or present findings for which the Article format is not appropriate. Book or monograph Reviews of 500 words or less are also considered. Other categories of papers are occasionally published. All papers are published only in English. Abstracts of the Articles or Reports may be printed in other languages if supplied by the author(s) with English translations.
期刊最新文献
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