Natural establishment of Eucalyptus globulus Labill. in burnt stands in Portugal
Natural establishment of Eucalyptus globulus Labill. in burnt stands in Portugal
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DOI：
10.1016/j.foreco.2014.03.012
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发表时间：
2014-07-01
影响因子：
3.7
通讯作者：
Moreira, Francisco
中科院分区：
文献类型：
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作者：
Aguas, Ana;Ferreira, Antonio;Moreira, Francisco
外来树种在世界上许多地区越来越普遍，至少有一些树种在它们引进的地区被归化。像火灾这样的干扰可能是这些物种归化的起源或加速。葡萄牙拥有世界上最大的桉树种植园之一，也是受森林火灾影响最严重的国家之一。这两个事实引发了本文的研究。本研究的目的是研究在自然条件下燃烧人工林（纯球松林、纯球松林和两种树种混交林）中球松种子源植物的中期自然建立特征，并分析影响球松种子源植物建立的相关因素。野火发生57年后，在葡萄牙中部和北部被烧毁地区的284个地点，对自然生长的球芽甘蓝植物的发生率、丰度和高度进行了分析。采用广义线性模型评估了林分类型、区域生产力潜力和火灾后管理措施对球棘个体发生概率、密度和中位高度的影响。利用相似性分析和非度量多维尺度分析，研究了这些解释变量对自然建立的球棘球绦虫队列结构（就大小类分布而言）的影响。天然建立的球豆属植物在纯球豆属、纯赤杨属和混交林中分别占93.1%、19.0%和98.6%。队列中位密度为0.20株m(-2)，最大密度为4.55株m（-2）。株高中位数为2.0 m，株高中位数为1.30 m，株高中位数为95.3%
Exotic tree species are increasingly common in many regions of the world and at least some species are becoming naturalized in the regions where they were introduced. Disturbances like fire may be at the origin or accelerate the naturalization of these species. Portugal holds one of the largest areas of exotic Eucalyptus globulus plantations in the world and is one of the countries most affected by forest fires. These two facts have triggered the present research. This study aimed at characterising medium-term natural establishment of E. globulus plants originated from seeds under natural conditions in burnt planted forests (pure E. globulus stands, pure Pinus pinaster stands, and mixed stands of both species), and at analysing factors associated with this establishment. Occurrence, abundance and height of naturally established E. globulus plants were characterized in 284 sites distributed in burnt areas, across Central and Northern Portugal, 57 years after wildfire. Generalized linear models were used to assess the influence of stand type, regional productivity potential, and post-fire management practices on occurrence probability, density, and median height of sampled E. globulus individuals. The influence of these explanatory variables on the structure (in terms of size class distribution) of naturally established E. globulus cohort was examined using analysis of similarity and non-metric multidimensional scaling. Naturally established E. globulus plants were present in 93.1%, 19.0% and 98.6% of samples in pure E. globulus, pure P. pinaster and mixed stands, respectively. Cohort median density was 0.20 plants m(-2) and maximum density was 4.55 plants m(-2). Median height of plants was 2.0 m and 95.3% of them had h >1.30 m and