Collaborative Research: Dispersal Limitation as a Primary Factor in Determining Ectomycorrhizal Community Structure

合作研究：分散限制作为一个主要因素， 确定外生菌根群落结构 机构：加州大学伯克利分校 摘要日期：12/04/07 外生菌根真菌与温带森林树木如松树， 橡树白杨和桦树这些真菌为树木提供矿物质营养作为交换 而树木的生长和生存也需要它们。重症 森林火灾或伐木等干扰，树木需要重新建立它们之间的关系， 与菌根真菌一起生存。先前的研究表明，这些真菌 在这样的干扰之后，以有序的顺序或“连续”。新模型 提出通过孢子传播的差异来解释这种观察到的模式， 菌根真菌之间的竞争相互作用。该模型的四个关键预测 关于限制气生孢子传播和树木根系密度对真菌 竞争将通过实地取样和操纵相结合的方式进行测试。 生长室实验这项工作更广泛的影响是，它将帮助我们 了解树木建立所需的基本生物过程，并将建立一个 基础生态知识的一个重要群体的研究 有机体研究生和本科生的培训将是一个重要的 这项研究的组成部分。此外，这项工作还利用了它的位置， 雷耶斯角国家海滨，反馈到管理决策内， 公园，并通过针对公众教育的外联工作。

Proposal Title: Collaborative Research: Dispersal Limitation as a Primary Factor in Determining Ectomycorrhizal Community Structure Institution: University of California-Berkeley Abstract Date: 12/04/07 Ectomycorrhizal fungi are obligate mutualists with temperate forest trees such as pines, oaks, aspens, and birch. These fungi provide mineral nutrients to the trees in exchange for sugars, and trees require them for growth and survival. Following severe disturbance such as forest fires or logging, trees need to reestablish their relationships with mycorrhizal fungi in order to survive. Prior work has shown that these fungi arrive in an ordered sequence, or "succession", after such disturbances. A new model is proposed to explain this observed pattern through differences in spore dispersal and competitive interactions among mycorrhizal fungi. Four key predictions of this model concerning limitations to aerial spore dispersal and effect of tree root density on fungal competition will be tested through a combination of field sampling and manipulative growth-chamber experiments. The broader impacts of this work are that it will help us understand an essential biotic process necessary for tree establishment, and will build a foundation of basic ecological knowledge for an important group of understudied organisms. Training of graduate and undergraduate students will be an important component of this research. In addition this work takes advantage of its location within Point Reyes National Seashore by feeding back into management decisions within the park and through outreach efforts directed towards public education.