1999-2001 MICROMETEOROLOGICAL TRENDS AT THE FOREST-ATMOSPHERE CARBON TRANSFER AND STORAGE (FACTS-II) STUDY SITE

摘要

The USDA Forest Service's Northern Global Change Research Program (NGCRP) is supporting research to examine the impacts of multiple interacting stresses on ecosystems in the north central and northeastern U.S. (Birdsey et al. 1996). A key component ofthis research effort is an assessment of the individual and combined effects of increased tropospheric carbon dioxide (CO_2) and ozone (O3) concentrations on fundamental physical and biological processes in northern hardwood ecosystems. In support of the NGCRP, the ongoing Forest-Atmosphere Carbon Transfer and Storage (FACTS-II) experiment at the Free-Air Carbon Dioxide Enrichment (FACE) facility in northern Wisconsin (Dickson et al. 2000) is assessing the potential long-term biological and physical impacts of elevated surface CO_2 and O_3 concentrations on plots of trembling aspen (Populus tremuloides Michx.), paper birch (Betula Papyrifera Marsh.), and sugar maple (Acer saccharum Marsh.). These three tree species are common to forests in the Great Lakes region.