INITIAL ASSESSMENT OF MULTISCALE MEASURES OF CO2 AND H2O FLUX IN THE SIBERIAN TAIGA

We measured CO2 and H2O fluxes between undisturbed Larix gmelinii fore st and the atmosphere at a remote Eastern Siberian site in July 1993. Scaled-up leaf-level porometer measurements agreed with those derived from the eddy correlation technique for the canopy fluxes of CO2 and H 2O. Patch-scale measurements of ecosystem CO2 exchange agreed in turn with regional CO2 exchange rates derived from aircraft measurements ma de throughout the convective boundary layer. At all scales, midsummer CO2 fluxes for this vast, dry boreal forest were low, with maximum C u ptake rates of only about 5 mu mol m(-2) s(-1).