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首页> 外文期刊>Flora >Population structure and population dynamic of Pulsatilla patens (L.) Mill. in relation to vegetation characteristics
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Population structure and population dynamic of Pulsatilla patens (L.) Mill. in relation to vegetation characteristics

机译：白头翁（L.）Mill的种群结构和种群动态。关于植被特征

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In 2003, the last existing population of Pulsatilla patens in Germany was studied in the nature reserve "Garchinger Heide", a calcareous grassland north of Munich. The aim of our study was to evaluate the endangerment of the species in ancient and young grasslands of the nature reserve. Therefore, the size, structure and generative reproduction of the population in relation to vegetation characteristics were investigated. Total population size and mean density of individual plants in different zones of the nature reserve were determined by a GPS-supported counting and compared to a mapping of 1991. The population structure was analyzed by counting the number of individuals of different age-state classes on 4 m(2) plots in ancient and young grasslands of the nature reserve. The cover of phanerogams, cryptogams, litter and bare soil was studied in order to characterize habitat quality. In 2003, about 9700 individuals of P. patens were counted which means that population size strongly decreased in comparison to 1991 (about 27000). In the ancient grasslands, the number of individuals of all age-state classes of P. patens correlated negatively with the cover of phanerogams and litter. In contrast, phanerogam and cryptogam cover had a positive influence on the number of individuals of all age-state classes on a topsoil-removal site due to protection from desiccation. This site was the only one in the nature reserve, where population size increased between 1991 and 2003. The large population size indicates that short-term endangerment or extinction of the species in the nature reserve is not very likely. Nevertheless, the management of the nature reserve has to be optimized in order to prevent a further long-term decrease of the population size of P. patens. (c) 2006 Elsevier GmbH. All rights reserved.
机译：2003年，在慕尼黑以北的钙质草原“ Garchinger Heide”自然保护区研究了德国白头翁的最后种群。我们研究的目的是评估自然保护区古代和年轻草原上该物种的危害。因此，研究了种群的大小，结构和生殖繁殖与植被特征的关系。通过GPS支持的计数来确定自然保护区不同区域中个体植物的总种群大小和平均密度，并将其与1991年的制图进行比较。通过对不同年龄状态类别的个体数量进行计数来分析种群结构。在自然保护区的古老和年轻草原上有4 m（2）的地块。为了表征生境质量，对phanerogams，cryptgams，枯枝落叶和裸土的覆盖层进行了研究。在2003年，计数了约9700个P. patens的个体，这意味着与1991年（约27000）相比，种群的数量大大减少了。在古老的草原上，所有年龄状态的P. patens种类的个体数量都与斑节菜和凋落物的覆盖率呈负相关。相比之下，phanerogam和cryptgamgam的覆盖对表土去除现场的各个年龄段的人的数量产生了积极的影响，这是由于其受到了干燥的保护。该站点是自然保护区中唯一的一个站点，种群数量在1991年至2003年之间增加。人口数量庞大，表明该自然保护区物种的短期濒临灭绝的可能性很小。然而，必须对自然保护区的管理进行优化，以防止斑节对虾的种群数量进一步长期减少。 （c）2006 Elsevier GmbH。版权所有。

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