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Mycorrhizal Mediation of Plant Competition and Community Structure

菌根介导植物竞争和群落结构

基本信息

批准号：
9020426
负责人：
David Hartnett
金额：
$ 29.31万
依托单位：
Kansas State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-02-01 至 1994-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020426&HistoricalAwards=false
关键词：
Mycorrhizal Mediation Plant Competition Community

项目摘要

Various types of species interactions including competition, herbivory, and mutualisms, as well as disturbance and other processes operating at different spatio-temporal scales may influence the structure and diversity of plant communities. Many of these processes have been studied independently, but the interactions between these various organizing influences are not understood. Asses how a mutualism (Vesicular-arbuscular Mycorrhizae (VAM) and plant competition interact to shape grassland community structure within the natural context of a variable regime of large scale disturbance. Co-occurring plant species may respond differentially to the effects of VAM fungi, and these differential responses to VAM fungi may strongly influence plant competition and community sturcture. The objectives of this research are to 1) assess the importance of VAM determine how VAM fungi influence competition among co-occurring plants which vary in mycorrhizal dependence at both the seedling and established plant stage, and 3) to understand how mycorrhizal-mediation of these processess influences plant community structure. Tallgrass prairie represents an ideal system for the proposed studies because both mycorrhiza dependent grasses and forbs (obligate mycotrophs and relatively independent species (facultative mycotrophs) coexist as important species and compets for resources. //

在不同的时空尺度上，各种类型的物种相互作用，包括竞争、食草和互惠，以及干扰和其他过程都可能影响植物群落的结构和多样性。许多这些过程已被独立研究，但这些不同组织影响之间的相互作用尚不清楚。评估互惠共生（泡状-丛枝菌根（VAM））和植物竞争如何在大规模扰动的可变制度的自然环境中相互作用以形成草地群落结构。共生植物物种可能对VAM真菌的作用有不同的反应，这些对VAM真菌的差异反应可能强烈地影响植物的竞争和群落结构。本研究的目的是1)评估VAM的重要性，确定VAM真菌如何影响共生植物之间的竞争，这些植物在苗期和成虫期对菌根的依赖性不同；3)了解菌根介导这些过程如何影响植物群落结构。高草草原是一个理想的研究系统，因为依赖菌根的草和草（专性分枝杆菌）和相对独立的物种（兼性分枝杆菌）作为重要物种共存，并竞争资源。//