Plant-Microbe Interactions and the Production of Dissolved Organic Carbon and Nitrogen

植物-微生物相互作用以及溶解有机碳和氮的产生

• 批准号: 0075397
• 负责人: Kurt Pregitzer
• 金额: $ 88.35万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0075397&HistoricalAwards=false
• 关键词: Plant; Microbe; Interactions; Production; Dissolved

Abstract00-75397PregitzerPlant-microbe interactions and the production of dissolved organic carbon and nitrogenNitrogen (N) saturation of terrestrial ecosystems is one of the most important contemporary ecological issues. Researchers at Michigan Technological University and the University of Michigan are adding nitrate (NO3-) to northern hardwood forests in Michigan to learn how this common forest type responds to chronic N additions. After six years, a variety of changes indicate chronic N additions have altered ecosystem processes. These include much greater leaching losses of dissolved organic carbon, dissolved organic nitrogen and nitrate, and reduced soil respiration. Over the next three years the research team will continue the nitrate additions in order to learn the specific mechanisms behind these changes and to determine if they will persist over time or if they are only temporary responses that will fade as the ecosystems adjust to higher levels of N availability. If the changes persist or magnify, they could have profound effects on this widely-distributed forest type.

植物-微生物相互作用与溶解性有机碳和氮的产生陆地生态系统的氮（N）饱和是当代最重要的生态学问题之一。 密歇根理工大学和密歇根大学的研究人员正在向密歇根州的北方硬木森林中添加硝酸盐（NO3-），以了解这种常见的森林类型对长期氮添加的反应。 六年后，各种变化表明，慢性N添加改变了生态系统过程。 这包括溶解有机碳、溶解有机氮和硝酸盐的沥滤损失更大，土壤呼吸作用减少。在接下来的三年里，研究小组将继续添加硝酸盐，以了解这些变化背后的具体机制，并确定它们是否会随着时间的推移而持续存在，或者它们是否只是暂时的反应，随着生态系统适应更高水平的氮可用性而逐渐消失。 如果这些变化持续或扩大，它们可能对这种广泛分布的森林类型产生深远的影响。