The role of gap dynamics for the regeneration of the natural spruce forests in the Harz Mountains

林隙动态对哈尔茨山天然云杉林再生的作用

• 批准号: 27193410
• 负责人: Professor Dr. Helge Bruelheide
• 金额: --
• 依托单位: Lehrstuhl Geobotanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27193410?language=en
• 关键词: role; gap; dynamics; regeneration; natural

In Central Europe only few places are known where vegetation regeneration after natural disturbances can be studied in natural or near-natural Picea abies forests; one example are the slopes of Mt. Brocken. Although being mono-dominant, the spruce forests at Mt. Brocken are unique because they contain autochthonous Picea abies genotypes. In addition, the herb layer is comparably species-poor with a high proportion of clonally reproducing species. Based on the assumption that gap dynamics are equally important for regeneration of the tree and herb layer as in other forest types, the project seeks to test four main hypotheses. For the tree layer, it will be tested whether gaps promote the establishment of allochthonous genotypes of Picea abies and whether the proportion of autochthonous genotypes increases with gap age due to strong environmental selection. For herb layer regeneration the hypotheses are tested that generative reproduction is enhanced in gaps for the abundant clonal species Vaccinium myrtillus, Calamagrostis villosa and Trientalis europaeus and that clone size increases with gap age. To attain its goal the project employs GIS, dendrochronology and molecular genetic approaches. Using aerial photographs, gaps will be stratified according to age and sampled for species composition and population structure of target species. The field observations will be supplemented by experiments on establishment, frost hardiness and vegetative regeneration capacity of spruce as well as on clonal growth of target herbs.

在中欧，只有少数地方可以在自然或近自然的云杉林中研究自然干扰后的植被再生;一个例子是Mt.布罗肯虽然是单一优势，云杉林在山。布罗肯是独特的，因为它们包含了当地的欧洲云杉基因型。此外，草本层是无性繁殖物种的比例很高的物种贫乏。基于林隙动态对树木和草本层的再生与其他森林类型一样重要的假设，该项目试图检验四个主要假设。对于树层，它将被测试是否间隙促进建立外来基因型的欧洲云杉和是否本地基因型的比例增加，由于强大的环境选择与间隙年龄。草本层再生的假设进行了测试，生殖繁殖增强的差距，丰富的克隆物种欧洲越橘，绒毛拂子茅和Trientalis europaeus和克隆大小随间隙年龄的增加。为实现其目标，该项目采用了地理信息系统、树木年代学和分子遗传学方法。利用航空照片，将根据年龄对林隙进行分层，并对目标物种的物种组成和种群结构进行取样。在野外观察的基础上，还将进行云杉的建植、抗寒性和营养更新能力以及目标草本植物的克隆生长试验。