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首页> 外文期刊>Scandinavian Journal of Forest Research >Effects of ungulate browsing on recruitment of aspen and rowan: a demographic approach
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Effects of ungulate browsing on recruitment of aspen and rowan: a demographic approach

机译：有蹄类动物浏览对白杨和罗文招募的影响：人口统计学方法

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Aspen (Populus tremula L.) and rowan (Sorbus aucuparia L.) are important for biodiversity conservation and aesthetic reasons. Intensified levels of ungulate browsing the last decades have raised concerns over the recruitment of aspen and rowan in boreal forests. Demographic data are vital to understand and quantify how the structure of tree populations are affected over time by browsing and other factors but such data are rare. In a five-year study, we quantified vital demographic rates for co-occurring aspen and rowan using exclosures in a productive forest area in eastern-central Sweden. Mean annual browsing rate on small (1 m) aspen and rowan stems was 20 vs. 38%, whereas the order in browsing intensity was reversed for stems of medium (1-2 m) size (28 vs. 14%). Browsing had a clear negative effect on transition rate from small to medium size class in both species, but had a much smaller impact on transition rate from medium to large (2-3 m) size class. Residence time for small stems and regeneration rate was much higher in aspen than in rowan, but browsing did not affect these dynamics. Transition to ungulate safe height (>3 m) was reduced with a factor of two in rowan and four in aspen by browsing.
机译：白杨（Populus tremula L.）和罗文（Sorbus aucuparia L.）对于保护生物多样性和审美原因很重要。在过去的几十年中，有蹄类动物的浏览水平越来越高，这引起了人们对在北方森林中补充白杨和罗文的担忧。人口统计数据对于理解和量化浏览和其他因素如何随时间影响树木种群的结构至关重要，但是这种数据很少。在一项为期五年的研究中，我们使用瑞典东部中部一个生产性森林地区的排泄物，量化了同时发生的白杨和罗文的重要人口统计率。小（<1 m）白杨和罗文茎的平均年浏览率分别为20％和38％，而中等（1-2 m）大小的茎的浏览强度顺序相反（28％对14％）。在两个物种中，浏览对从小到中等尺寸类别的转换速率都有明显的负面影响，但对从中等到大（2-3 m）尺寸类别的转换速率的影响要小得多。白杨的小茎停留时间和再生速率比罗文的高得多，但浏览并没有影响这些动态。通过浏览，向有蹄类动物安全高度（> 3 m）的过渡减少了两倍，其中罗文为2，白杨为4。

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