Suppr超能文献

多种干扰因素加速了一种可能形成单优势种的竹子的克隆生长。

Multiple disturbances accelerate clonal growth in a potentially monodominant bamboo.

作者信息

Gagnon Paul R, Platt William J

机构信息

Louisiana State University, Department of Biological Sciences, Baton Rouge, Louisiana 70803, USA.

出版信息

Ecology. 2008 Mar;89(3):612-8. doi: 10.1890/07-1255.1.

Abstract

Organisms capable of rapid clonal growth sometimes monopolize newly freed space and resources. We hypothesize that sequential disturbances might change short-term clonal demography of these organisms in ways that promote formation of monotypic stands. We examined this hypothesis by studying the clonal response of Arundinaria gigantea (giant cane, a bamboo) to windstorm and fire. We studied giant cane growing in both a large tornado-blowdown gap and under forest canopy, in burned and unburned plots, using a split-block design. We measured density of giant cane ramets (culms) and calculated finite rates of increase (lamda) for populations of ramets over three years. Ramet density nearly doubled in stands subjected to both windstorm and fire; the high ramet densities that resulted could inhibit growth in other plants. In comparison, ramet density increased more slowly after windstorm alone, decreased after fire alone, and remained in stasis in controls. We predict that small, sparse stands of giant cane could spread and amalgamate to form dense, monotypic stands (called "canebrakes") that might influence fire return intervals and act as an alternative state to bottomland forest. Other clonal species may similarly form monotypic stands following successive disturbances via rapid clonal growth.

摘要

能够快速进行克隆生长的生物有时会垄断新腾出的空间和资源。我们推测,连续的干扰可能会以促进单种林分形成的方式改变这些生物的短期克隆种群统计学特征。我们通过研究巨节竹(一种竹子)对风暴和火灾的克隆反应来检验这一推测。我们采用裂区设计,研究了生长在大型龙卷风造成的林中空地和林冠下、处于火烧和未火烧地块的巨节竹。我们测量了巨节竹分株(茎秆)的密度,并计算了分株种群在三年间的有限增长率(λ)。在遭受风暴和火灾的林分中,分株密度几乎增加了一倍;由此产生的高分株密度可能会抑制其他植物的生长。相比之下,仅遭受风暴后分株密度增加得较慢,仅遭受火灾后分株密度下降,而对照区则保持稳定。我们预测,小片、稀疏的巨节竹林可能会扩散并合并形成密集的单种林分(称为“藤丛”),这可能会影响火灾间隔时间,并成为河漫滩森林的一种替代状态。其他克隆物种可能同样会在连续干扰后通过快速克隆生长形成单种林分。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验