Incidence, size and spatial structure of clones in second-growth stands of coast redwood, Sequoia sempervirens (Cupressaceae).
Incidence, size and spatial structure of clones in second-growth stands of coast redwood, Sequoia sempervirens (Cupressaceae).
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海岸红杉、红杉（柏科）次生林中无性系的发生率、大小和空间结构。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. Dodd
中科院分区：
文献类型：
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作者：
V. Douhovnikoff;Adelaide M Cheng;R. Dodd
海岸红杉（Sequoia sempervirens）的生态和进化潜力受到克隆传播在其繁殖和地点持久性中发挥的重要作用的显着影响。在九个次生林中，使用扩增片段长度多态性（AFLP）来鉴定红杉克隆结构。克隆（多茎基因）占主导地位，平均占所测量茎的 70%，大小从 2 到 20 个茎不等。因此，相对较少数量的基因可以垄断不成比例的站点资源，更有可能随着时间的推移持续存在，并具有更大的现场遗传代表性。克隆并不局限于仙女环结构，而是由多种形状组成，包括同心环、环链、分离和线性结构。测量到的分株间距离长达 40 m，表明克隆繁殖不仅限于基部树桩再发芽。第二生长林的克隆结构与早期关于老生长的报告相似，强调了场地持久性和长期、渐进的场地发展的重要性。老生长中每个基因的分株数量较小可能是由于局部基因内自我稀疏。更好地了解这些森林中克隆传播的动态和结构将有益于红杉的管理和保护。
The ecology and evolutionary potential of coast redwood (Sequoia sempervirens) is significantly influenced by the important role clonal spread plays in its reproduction and site persistence. In nine second-growth stands, amplified fragment length polymorphisms (AFLPs) were used to identify redwood clonal architecture. Clones (multistem genets) dominated sites by representing an average of 70% of stems measured, ranging in size from two to 20 stems. As a result, a relatively small number of genets can monopolize a disproportionate amount of site resources, are more likely to persist over time, and have greater on-site genetic representation. Clones were not limited to fairy-ring structures, but consisted of a wide range of shapes including concentric rings, ring chains, disjunct, and linear structures. Between-ramet distances of up to 40 m were measured, indicating that clonal reproduction is not limited to basal stump resprouting. Clonal structure in second-growth stands was similar to earlier reports from old growth, emphasizing the importance of site persistence and long-term, gradual site development. Smaller ramet numbers per genet in old growth is probably due to local within-genet self thinning. Management and conservation of redwoods will benefit from a better understanding of the dynamics and structure of clonal spread in these forests.