Chronic Nitrogen Additions to Forest Ecosystems: Effects on Nitrogen Cycling, Canopy Chemistry and Nitrous Oxide Emissions

森林生态系统的长期氮添加：对氮循环、冠层化学和一氧化二氮排放的影响

• 批准号: 8706203
• 负责人: John Aber
• 金额: $ 137.89万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8706203&HistoricalAwards=false
• 关键词: Chronic; Nitrogen; Additions; Forest; Ecosystems

The proposed research will examine changes in nitrous oxide emissions from two forest ecosystems in response to chronic additions of ammonium nitrate. Measurements will also be made of nitrogen mineralization and nitrification, nitrate leaching, and changes in the biomass and chemical content of foligage and fine roots. The purpose of this combination of measurements is to increase our understanding of the relationships between elevated rates of nitrogen inputs currently occurring in many temperate forest zones, the rate and form of nitrogen cycling in those forests, and the impact of increasing nitrogen cycling rates on regional emissions of nitrous oxide. An additional goal is to develop quantitative relationships between emissions and foliar biomass and chemistry which can be used in conjunction with emerging remote sensing technologies to estimate Nz0 flux over whole vegetation types or regions.

这项拟议中的研究将检查一氧化二氮的变化 两个森林生态系统对慢性 添加硝酸铵。 还将测量 氮的矿化和硝化作用，硝酸盐淋溶， 在生物量和化学含量的变化叶和细 根 这种测量组合的目的是 增加我们对提升的 目前在许多温带地区发生的氮输入率 森林地带，氮循环的速度和形式， 氮循环速率的增加对森林的影响 一氧化二氮的区域排放。 另一个目标是 发展排放量和叶面积之间的定量关系 生物质和化学物质，可与 新出现的遥感技术， 整个植被类型或区域。