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首页> 外文期刊>Forest Systems >Forest structure of Mediterranean yew (Taxus baccata L.) populations and neighbor effects on juvenile yew performance in the NE Iberian Peninsula
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Forest structure of Mediterranean yew (Taxus baccata L.) populations and neighbor effects on juvenile yew performance in the NE Iberian Peninsula

机译：东伊比利亚半岛地中海紫杉（Taxus baccata L.）种群的森林结构及其对幼年紫杉性能的影响

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Aim of study: In the Mediterranean region, yew ( Taxus baccata L.) usually grows with other tree species in mixed forests. Yew recruitment and juvenile growth may depend on the structure of the forest and the net balance between competition for soil water and nutrients with neighbors and facilitation that these neighbors exert by protecting the plants from direct sun exposure. This study aims, at a regional scale, to analyze the structure of forests containing yew, and, on an individual level, to analyze the effect of the surrounding vegetation structure on the performance of yew juveniles. Area of study: The structural typologies of yew populations were defined based on field inventories conducted in 55 plots distributed in 14 localities in the North-Eastern (NE) Iberian Peninsula, covering a wide range of yew distribution in the area. In a second step, an analysis of neighboring species' effects on juveniles was conducted based on the data from 103 plots centered in yew juveniles in five localities. Main Results: A cluster analysis classified the inventoried stands into four forest structural types: two multi-stratified forests with scattered yew and two yew groves. Multiple regression modeling showed that the δ 13 C measured in last year's leaves positively relates to the basal area of conifer neighbors, but negatively with the cover of the yew crown by other trees. Research highlights: At a stand-level, the density of recruits and juveniles (625 ± 104 recruits ha -1 , 259 ± 55 juveniles ha -1 ) in mixed forests was found to be higher than that on yew dominant stands (181 ± 88 recruits ha -1 and 57 ± 88 juveniles ha -1 ). At an individual-level, the water stress (estimated from leaf δ 13 C) of yew juveniles seems alleviated by the crown cover by neighbors while it increases with the basal area of conifers. Yew conservation should focus on selective felling for the reduction of basal area of neighbors surrounding the target tree, but avoid affecting the canopy cover to contribute to enhanced yew juvenile growth. {end} Biodiversity conservation; δ 13 C; forest management; plant-plant interaction; recruitment; Taxus baccata ; water use efficiency.
机译：研究目的：在地中海地区，紫杉（红豆杉）通常与其他树种一起在混交林中生长。紫杉的募集和幼年的生长可能取决于森林的结构以及与邻居争夺土壤水和养分之间的净平衡以及这些邻居通过保护植物免受阳光直射而产生的促进作用。这项研究旨在在区域范围内分析含紫杉的森林结构，并在个体层面上分析周围植被结构对紫杉幼体性能的影响。研究领域：紫杉种群的结构类型是根据在伊比利亚东北半岛东北14个地区分布的55个样地中进行的实地调查确定的，涵盖了该地区广泛的紫杉分布。第二步，基于五个地区以紫杉幼体为中心的103个样地的数据，对邻近物种对幼体的影响进行了分析。主要结果：聚类分析将清查林分分为四种森林结构类型：两个散布红豆杉的复层林和两个红豆杉林。多元回归模型显示，去年的叶子中测得的δ13 C与针叶树邻居的基础面积成正相关，而与其他红豆杉树冠的覆盖呈负相关。研究重点：在标准林中，混合林中新兵和幼虫的密度（625±104新兵ha -1，259±55个幼虫ha -1）高于紫杉优势林（181±88）新兵ha -1和57±88岁的ha -1）。在个体水平上，紫杉幼体的水分胁迫（从叶δ13 C推算）似乎被邻居的冠冠覆盖所缓解，而随着针叶树的基础面积的增加而增加。紫杉的养护应集中于选择性砍伐，以减少目标树周围邻居的基础面积，但应避免影响冠层的覆盖，以促进紫杉幼体的生长。 {end}保护生物多样性; δ13​​ C;森林管理;植物与植物的相互作用招聘;南方红豆杉;用水效率。

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