Regional Estimation of Nitrous Oxide and Methane Flux from Subalpine Boreal Soils of the Northeastern United States

研究的目的是评估区域影响 长期氮添加到云冷杉林中的影响 美国东北部对净一氧化二氮（N2 O）和甲烷（CH 4）的影响 剂. 将采用的办法包括对下列项目进行密集抽样 在一系列先前研究的云冷杉森林中的气体通量 覆盖了缅因州东部和纽约东部之间的地区， 在佛蒙特州南部的一个实验地点， 正在增加一个红云杉的立场。这两个偏远的 传感和地理信息系统（GIS）方法将是 用于将测量值外推到区域总数， 将对这两项措施的有效性进行评估。 接近。 具体活动包括：1）密集测量 大气与土壤之间的N2 O和CH 4净排放量 云冷杉林类型内的地区， 氮素经济的差异，2）收集叶面 从每个地点采集样本，用于测定总冠层木质素， 氮和纤维素含量; 3）冠层遥感 利用宽波段和高光谱分辨率的化学 (FLI，AVIRIS）传感器，以及4）使用遥感 数据和广泛的硝化率地面调查 通过使用地理信息系统推断， 估算云冷杉带的N2 O和CH 4净通量。 该项目由NSF和NASA共同资助。 的 研究人员有资格进行这类研究， 该项目的设施和机构支持是 好极了

The purpose of the research is to assess the regional impact of chronic nitrogen additions to spruce-fir forests in the northeastern U.S. on net nitrous oxide (N2O) and methane (CH4) fluxes. The approaches to be used include intensive sampling of gas fluxes in a series of previously studied spruce-fir forests covering the region between eastern Maine and eastern New York, and from an experimental site in Southern Vermont where chronic N additions are being made to a red spruce stand. Both remote sensing and Geographic Information System (GIS) methods will be used to extrapolate measurements to regional totals, and an evaluation will be made of the effectiveness of these two approaches. Specific activities include: 1) intensive measurements of net N2O and CH4 flues between the atmosphere and soils in five areas within the spruce-fir forest type with documented differences in nitrogen economies, 2) collection of foliar samples from each site for determination of total canopy lignin, nitrogen and cellulose content, 3) remote sensing of canopy chemistry using broad-band (TM) and high spectral resolution (FLI, AVIRIS) sensors, and 4) the use of both remote sensing data, and extensive ground surveys of nitrification rates extrapolated through the use of a geographic information system, to estimate of net N2O and CH4 fluxes for the spruce-fir zone. The project is jointly funded by NSF and NASA. The investigators are well qualified for this type of research and the facilities and institutional support for the project are excellent.