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首页> 外文期刊>Insect conservation and diversity >The effects of forest age on saproxylic beetle biodiversity: implications of shortened and extended rotation lengths in a French oak high forest.
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The effects of forest age on saproxylic beetle biodiversity: implications of shortened and extended rotation lengths in a French oak high forest.

机译：森林年龄对四叶甲虫生物多样性的影响：法国橡木高林中轮伐长度的延长和延长的影响。

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In French oak high forests, current silvicultural trends include two seemingly opposed practices: shortening the forestry cycle, which contributes to forestry intensification, and lengthening rotations in temporary set-aside stands, called 'ageing islands', to favour biodiversity and high-quality large-diameter tree production. To derive the potential effects of these two trends, we studied habitat structure and saproxylic beetles biodiversity along an age gradient in a French oak high forest. Four age classes were surveyed: premature (i) 160/180 years and (ii) 180/200 years, (iii) mature 200/220 years, and (iv) overmature 300-yearold stands. Structural features were noted: deadwood volumes, density of large trees with or without microhabitats, number of cavities, presence of dead large canopy branches, sap droppings and sporophores of saproxylic fungi. Results showed that beetle species richness was positively related to stand age. Globally, overmature stands differed significantly from younger premature and mature forests in species composition and structure. Younger stands tended to show both fewer structural features and lower levels of saproxylic biodiversity. As the forest aged, the overall structural complexity and saproxylic biodiversity increased. However, no individual stand characteristic influenced preferentially biodiversity, and stand age was the best explaining factor. In conclusion, we discuss how (i) shorter rotations in the high forest production cycle and (ii) temporary set-aside forest islands affect forest structure and deadwood-associated assemblages. Shortening rotation length in oak high forests may negatively impact saproxylic biodiversity, whereas temporary setasides may play a key role for biodiversity conservation in a managed forest matrix.Digital Object Identifier http://dx.doi.org/10.1111/j.1752-4598.2012.00214.x
机译：在法国橡木高林中，目前的造林趋势包括两种看似相反的做法：缩短林业周期，这有助于森林集约化;以及延长临时搁置林（称为“老龄岛”）的轮换，以有利于生物多样性和高质量的大型林木。直径树的生产。为了推论这两种趋势的潜在影响，我们研究了法国橡木高森林中的生境结构和沿年龄梯度的鼠尾草甲虫的生物多样性。调查了四个年龄等级：（i）160/180岁和（ii）180/200岁，（iii）200/220岁，以及（iv）300岁的过早成熟。注意到结构特征：枯木体积，带有或不带有微生境的大树的密度，空洞的数量，死去的大冠层分支的存在，树液和腐殖真菌的孢子体。结果表明，甲虫物种丰富度与林分年龄呈正相关。在全球范围内，过早的林分在物种组成和结构上与年轻的早熟和成熟森林有显着差异。较年轻的林分往往显示较少的结构特征和较低水平的saproxylic生物多样性。随着森林的老化，总体结构复杂性和saproxylic生物多样性增加。但是，没有个体的林分特征优先影响生物多样性，林分年龄是最好的解释因素。最后，我们讨论了（i）高森林生产周期中较短的轮换和（ii）临时搁置的森林岛如何影响森林结构和与沉材相关的组合。橡树林高森林中轮作长度的缩短可能会对Saproxylic生物多样性产生负面影响，而临时山毛榉可能在受管理的森林基质中对生物多样性的保护发挥关键作用。数字对象标识符http://dx.doi.org/10.1111/j.1752-4598.2012 .00214.x

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