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Dissertation Research: The Effects of Light and Arbuscular Mycorrhizae on Oak Savanna Plant Community Composition

论文研究：光和丛枝菌根对橡树稀树草原植物群落组成的影响

基本信息

批准号：
0104928
负责人：
Thomas Givnish
金额：
$ 0.52万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-05-15 至 2003-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104928&HistoricalAwards=false
关键词：
Dissertation Research Effects Light Arbuscular

项目摘要

Arbuscular mycorrhizal fungi (AMF) are the most common kind of beneficial fungi associated with plant roots. This study tests the hypothesis that light availability and AMF interact to influence the composition of the remarkably diverse plant communities in Midwestern oak savannas. Plants in sunnier areas have greater needs for soil nutrients, and so may benefit more from AMF (or from highly active AMF species) than plants in shady sites. Plants in shady sites should either lack AMF or be associated with species having lower metabolic rates. Shifts in the kinds and numbers of fungal species along sun-to-shade gradients may thus have a profound effect on the identity and diversity of savanna plants. To test these ideas, we will first measure the distributions of plant species and AMF species as a function of light availability and soil texture in three Wisconsin savannas. The effects of AMF on understory plants will then be evaluated by applying fungicide to experimental field plots and documenting changes in plant composition over a two-year period relative to untreated plots. Finally, we will conduct experiments under greenhouse conditions to determine the effects of different AMF species on the growth of individual plant species when they are grown alone, and on the competitive ability of those same species when grown together.

丛枝菌根真菌（Arbuscular mycorrhizal fungi，AMF）是最常见的一类与植物根系共生的有益真菌。这项研究测试的假设，光的可用性和AMF相互作用，影响中西部橡树稀树草原的显着不同的植物群落的组成。阳光充足地区的植物对土壤养分的需求更大，因此可能比阴凉地区的植物从AMF（或高度活跃的AMF物种）中受益更多。在阴凉处的植物要么缺乏AMF，要么与代谢率较低的物种有关。真菌种类和数量的变化沿着太阳到阴影的梯度，因此可能对热带稀树草原植物的身份和多样性产生深远的影响。为了验证这些想法，我们将首先测量植物物种和AMF物种的分布作为光的可用性和土壤质地的函数在三个威斯康星州稀树草原。AMF对林下植物的影响，然后将通过应用杀菌剂的试验田地块和记录植物组成的变化，在一个为期两年的时间相对于未处理的地块进行评估。最后，我们将在温室条件下进行实验，以确定不同AMF物种对单独生长的单个植物物种的生长的影响，以及对共同生长的相同物种的竞争能力的影响。