Effects of Land Use on Nitrous Oxide and Nitric Oxide Emission from Soils of a Tropical Rainforest Region

土地利用对热带雨林地区土壤一氧化二氮和一氧化氮排放的影响

• 批准号: 9108035
• 负责人: William Reiners
• 金额: $ 11.15万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9108035&HistoricalAwards=false
• 关键词: Effects; Land; Use; Nitrous; Oxide

This project represents additional effort for completion and extension of current N2O and NO flux from tropical pastures and forests. The objectives of the project are: 1). to measure, over an annual cycle, N2O and NO flux from common land use types in lowland tropical Costa Rica representing a typical cycle of land usage: primary forests, active pastures created from these forests, abandoned pastures and secondary forests derived from abandoned pastures, and 2). to combine field experiments with the field measurements in objective 1 for determination of the importance of factors controlling the rates of these fluxes. For the additional period of research the project team will 1). complete the annual cycle on the land use plots, 2). make exploratory measurements of flux rates from other soil and land use types in the area to extend the ability to generalize results, and 3). carry out laboratory and field experiments that have been stimulated by earlier our findings. These experiments include rain storm simulations in forest sites to determination the causes for short-term time dynamics in gas flux from these systems, and fertilization experiments in pasture sites to determine the causes for lower rates of nitrogen oxide emissions in those systems compared with the forests.

该项目代表着完成的额外努力， 热带牧场当前N2 O和NO通量的扩展， 森林 该项目的目标是：1）。为了测量， 在一个年周期内，一般土地利用类型的N2 O和NO通量 在热带哥斯达黎加的低地， 土地利用：原始森林，从这些创建的活跃牧场 森林、废弃牧场和次生林， 废弃的牧场，2）。将联合收割机田间试验与 目标1中的实地测量， 控制这些通量率的因素的重要性。 对于额外的研究期间，项目团队将1）。 完成土地利用地块上的年周期; 2）.使 探索性测量其他土壤和土地的通量率 使用区域中的类型来扩展泛化能力 结果;（3）。进行实验室和现场实验， 受到了我们早期发现的启发 这些实验 包括在森林地点进行暴雨模拟， 这些气体通量的短期时间动态的原因 系统，并在牧场进行施肥试验， 确定氮氧化物排放率较低的原因 与森林相比，