Functioning of Grassland Mycorrhizae Under Elevated CO2 and Nitrogen

提案编号：DEB-9806529验证器： JOHNSON机构：北方亚利桑那大学本研究的目的是确定富集大气CO2浓度对维管植物和真菌之间的菌根关联的影响，在明尼苏达州的雪松溪LTER站点进行田间实验。 这项工作的重点是植物和真菌对群落和生态系统功能的影响，以及随着二氧化碳浓度的增加这些影响的变化。 将在纯培养和温室盆栽实验中进行额外的实验。 这项工作很重要，因为植物和真菌之间的菌根协会是初级生产和土壤过程之间的关键环节。 人为富集的大气CO2和土壤N预计会对这些重要的共生体产生重大影响，但目前对这种影响的性质知之甚少。

PROPOSAL # : DEB-9806529INVESTIGATOR(S) : JOHNSONINSTITUTION: NORTHERN ARIZONA UNIVERSITY The aims of this research are to determine effects of enriched atmospheric CO2 concentration on mycorrhizal associations between vascular plants and fungi, working in a field experiment at the Cedar Creek LTER site in Minnesota. The focus of the work is on effects of individual species of plants and fungi on community and ecosystem functioning, and on changes in those effects with CO2 enrichment. Additional experiments will be done in pure culture and in greenhouse pot experiments. The work is important because mycorrhizal associations between plants and fungi are a key link between primary production and soil processes. Anthropogenic enrichment of atmospheric CO2 and soil N is expected to have a significant impact on these vital symbioses but the nature of that impact is poorly understood at present.