Ecosystems Nitrogen Status and Trace Gas Fluxes

生态系统氮状态和微量气体通量

• 批准号: 9209696
• 负责人: Jerry Melillo
• 金额: $ 12.5万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9209696&HistoricalAwards=false
• 关键词: Ecosystems; Nitrogen; Status; Trace; Gas

Results from a four-year study to two chronic N-limited forests ecosystems at the Harvard Forest have shown rapid changes in CH4 consumption, and the initiation of pulse losses of N20. These have occurred in synchrony with changes in N03, leaching losses, N03 and NH4 concentrations in soils, C02 efflux, and foliar nitrogen chemistry. In this study, the principal investigators will measure C0 consumption in these same systems, which they hypothesize will respond analogously to CH4 consumption. The combined changes influxes of CH4, C0) and N20 they expect to elicit, if representative of regional-scale responses to chronic N deposition, would contribute significantly to altered atmospheric chemistry and global climate. The PI's are well qualified to conduct this research and the facilities are excellent.

对哈佛森林两个长期N有限森林生态系统的四年研究结果表明，CH4消耗迅速变化，N20开始脉冲损失。这些变化与N03、淋失、土壤中N03和NH4浓度、CO2排放和叶片氮化学的变化同步发生。在这项研究中，主要研究人员将测量这些相同系统中的C0消耗，他们假设这将与CH4消耗做出类似的反应。他们预计将引起的CH4、C0)和N20的组合变化，如果能代表区域范围内对慢性N沉积的反应，将对改变大气化学和全球气候作出重大贡献。PI很有资格进行这项研究，设施也很好。