The Keystone Role of Heterotrophic Microbes in Driving Ecosystem-level Effects of Nutrient Enrichment

异养微生物在驱动生态系统水平养分富集效应中的关键作用

• 批准号: 0318063
• 负责人: Amy Rosemond
• 金额: $ 52.69万
• 依托单位: University of Georgia Research Foundation Inc
• 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: 2003-10-01 至 2007-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0318063&HistoricalAwards=false
• 关键词: Keystone; Role; Heterotrophic; Microbes; Driving

The keystone role of heterotrophic microbes in driving ecosystem-level effects of nutrient enrichment A. D. Rosemond, J. B. Wallace, K. Suberkropp This project builds on a previous nutrient addition to a headwater stream in the southern Appalachian Mountains. This addition resulted in rapid decomposition of terrestrially derived organic matter, enhanced microbial production, especially fungi, and elevated invertebrate productivity. The proposed study is designed to separate the relative importance of fungi and bacteria in detritus-based systems. We will continue to add nutrients and eliminate the fungal component of the microbial community by adding a fungicide to the treatment stream. By greatly reducing fungi we will assess their importance to ecosystem processes such as litter decomposition, overall microbial production and respiration, invertebrate secondary production, suspended particle export, and organic matter storage. Our hypotheses will test the nature, and types of relationships between fungi and bacteria in detritus-based systems, i.e. do fungi and bacteria compete for carbon and nutrients or do they complement each other? This study adds to our understanding the importance of microbial diversity in ecosystem functions.

异养微生物在驱动生态系统水平的养分富集效应中的关键作用 A. D. Rosemond，J. B.华莱士，K.苏伯克洛普 该项目以之前向阿巴拉契亚山脉南部的源头溪流添加营养物为基础。 这一添加导致了陆地来源的有机物质的快速分解，增加了微生物的生产，特别是真菌，并提高了无脊椎动物的生产力。 拟议的研究旨在区分基于碎屑的系统中真菌和细菌的相对重要性。 我们将继续添加营养素，并通过在处理流中添加杀真菌剂来消除微生物群落中的真菌成分。 通过大大减少真菌，我们将评估它们对生态系统过程的重要性，如凋落物分解，整体微生物生产和呼吸，无脊椎动物的次级生产，悬浮颗粒出口和有机物储存。 我们的假设将测试的性质，和类型的真菌和细菌之间的关系在碎屑为基础的系统，即真菌和细菌竞争的碳和营养物质，还是他们互相补充？ 这项研究增加了我们对微生物多样性在生态系统功能中的重要性的理解。