Spatial and Temporal Dimensions of the Rhizopogon Spore Bank

Rhizopogon 孢子库的空间和时间维度

• 批准号: 0236096
• 负责人: Thomas Bruns
• 金额: $ 53.5万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-03-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0236096&HistoricalAwards=false
• 关键词: Spatial; Temporal; Dimensions; Rhizopogon; Spore

Ectomycorrhizal (EM )spore banks are a fundamental,but poorly studiedcomponent,of plant-fungal community ecology.EM spore banks can providethe inoculum necessary for tree recruitment following severe disturbance andmay facilitate tree invasion into bordering non-forested areas.Rhizopogon speciesare the most abundant component of spore banks in many western NorthAmerican pinaceous ecosystems,and in some forest-border settings they appearto be virtually the entire spore bank.This proposal is focused on understandingthe spatial and temporal dynamics of Rhizopogon spore banks in the context ofcyclic fire and pine regeneration.A conceptual model for these interactions isproposed,and five specific hypotheses related to the model are tested.Thesehypotheses focus on differences in spore longevity and spore dispersal amongRhizopogon species,and on differences in mode and frequency of dispersal withinmature-forests and post-fire forests.Measured parameters include:i)spatialpattern of the spore shadow in forest border zones,ii)current dispersal rates andmodes into these zones,iii)spore longevity of three key Rhizopogon species andiv)longevity of complex native spore banks.Hypotheses will be tested bycombining the techniques of bioassays,molecular ecology,large-scale spatialsampling,and seed bank ecology.The work addresses a crucial,but essentiallyunstudied,component of community ecology (i.e.,EM spore banks),andprovides an analogous system in which to test ideas developed for plant seedbanks.The broader impacts of this work are its direct relationship to forestregeneration and expansion;the ability to predict the spatial and temporal extentof the EM spore banks will provide forest managers with a rational way to assessthe likelihood of EM inoculum in highly disturbed systems.

外生菌根（EM）孢子库是植物真菌群落生态学的一个基本组成部分，但研究很少。EM孢子库可以为严重干扰后的树木补充提供必要的接种物，并可能促进树木入侵邻近的非森林地区。在许多北美西部松林生态系统中，根孢子虫物种是孢子库中最丰富的组成部分，在一些森林边界环境中，它们几乎是整个孢子库。本研究旨在了解在循环火灾和松树更新的背景下，根裂菌孢子库的时空动态。提出了这些相互作用的概念模型，并对与该模型相关的五个具体假设进行了测试。这些假设集中在孢子寿命和孢子传播的差异，以及在未成熟森林和火灾后森林中传播的方式和频率的差异。测量的参数包括：i)森林边界区孢子阴影的空间格局；ii)当前在这些区域的扩散速率和模式；iii)三种主要根孢子虫物种的孢子寿命；iv)复杂的本地孢子库的寿命。假设将通过结合生物测定、分子生态学、大规模空间采样和种子库生态学等技术进行测试。这项工作解决了群落生态学（即EM孢子库）的一个关键但本质上尚未研究的组成部分，并提供了一个类似的系统来测试为植物种子库开发的想法。这项工作的更广泛影响是它与造林和扩大的直接关系；预测EM孢子库的时空范围的能力将为森林管理者提供一种合理的方法来评估高度干扰系统中EM接种的可能性。