NASA Fluxnet Project

CO2 and water vapor fluxes and ecosystem characteristics were measured at 24 sites along a 317-km transect from the Arctic coast to the latitudinal treeline in Alaska during the growing seasons of 1994-1996. The sites were stratified to sample the ranges of climate, physiography, soil moisture, and vegetation type within the region. Our main objective was to understand what factors control variations in CO2 and water vapor exchange across the region. We therefore developed a spatially extensive approach of documenting fluxes for 1-2 weeks at each of the sites in order to study as many sites as...1994—1996年生长季期间，研究团队沿从阿拉斯加北极海岸延伸至纬度林线的317公里样带，在24个采样点开展了二氧化碳（CO₂）与水汽通量及生态系统特征的观测工作。所有采样点采用分层抽样策略，以覆盖研究区域内气候、地貌、土壤湿度与植被类型的全梯度范围。本研究的核心目标为厘清调控区域内二氧化碳与水汽交换通量变异的关键驱动因子。为此，研究团队构建了空间覆盖范围广泛的观测方案，在每个采样点开展1至2周的通量观测，以期尽可能多地覆盖研究站点……