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Dynamics in Central European near-natural Abies-Fagus forests: does the mosaic-cycle approach provide an appropriate model?

机译:中欧近乎自然的冷杉-迷雾森林的动态:镶嵌循环方法是否提供了合适的模型?

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Question: The mosaic-cycle concept of forest dynamics dominates in Central Europe. According to this concept intermediate-scale disturbances only accelerate the forest break-up under existing cycles of forest development. Is such an approach correct, or should new developmental cycles be elaborated for intermediate-scale disturbances? Location: Near-natural Abies alba-Fagus sylvatica forests in the Swietokrzyski National Park in Central Poland. In these forests intermediate-scale disturbances occurred between 1970 and 1990. Methods: Data were collected twice in areas surrounding 212 permanent sample points (in 1994 and 2004). Two increment cores were taken from 259 sample Abies trees. The effect of intermediate-scale disturbances on radial increment of Abies was assessed. Probabilities of stand transition during a 10-year period between individual stages and phases of development of the mixed forest were calculated. The development stages and phases were arranged into hypothetical succession series of successive changes. Results: In 1994 70 stands and in 2004, 47 stands representing stages and phases containing the older generation formed by trees >100-150 years were found. Also, in 1994 142 and in 2004, 165 stands representing stages and phases containing the younger generations only, formed by trees <100-150 years, were recorded. Stages and phases containing only younger generations do not occur in the existing forest development cycle which does not consider the influence of intermediate-scale disturbances separately. Two developmental cycles, which take into account the presence of the older generation and the younger generations only (under conditions of the occurrence of intermediate-scale disturbances), are proposed. Conclusion: The mosaic-cycle concept of forest dynamics can be used to analyse the dynamics of Central European near-natural mixed-species forests, but new developmental cycles should be elaborated for intermediate-scale disturbances.
机译:问题:森林动力学的镶嵌循环概念在中欧占主导地位。根据这个概念,中等规模的干扰只会加速森林在现有森林发展周期下的分裂。这样的方法是正确的,还是应该为中等规模的干扰制定新的开发周期?地点:波兰中部Swietokrzyski国家公园中的近乎自然的冷杉白桦林。在这些森林中,中度扰动发生在1970年至1990年之间。方法:在212个永久采样点周围的区域(1994年和2004年)两次收集数据。从259棵冷杉树中提取了两个增量核。评估了中等尺度干扰对冷杉径向增量的影响。计算了混交林发展的各个阶段和阶段之间在10年期间内林分过渡的可能性。开发阶段和阶段被安排为连续变化的假设连续系列。结果:在1994年发现了70个林分,在2004年发现了47个分树,分别代表由树龄大于100-150年的树木组成的较老的一代。另外,在1994年的142和2004年,记录了165个代表仅由年轻一代组成的阶段和阶段,这些树木由<100-150年的树木形成。在现有的森林发展周期中不会出现仅包含年轻世代的阶段和阶段,而现有森林发展周期没有单独考虑中等规模干扰的影响。提出了两个发展周期,它们仅考虑了老一代和年轻一代的存在(在发生中等规模扰动的条件下)。结论:森林动力学的镶嵌循环概念可用于分析中欧近自然混合种森林的动力学,但对于中等规模的扰动,应制定新的发展周期。

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