Jón Guðmundsson

TL;DR: Data of net ecosystem carbon exchange, collected between 1996 and 1998 from 15 European forests, confirm that many European forest ecosystems act as carbon sinks and indicate that, in general, ecosystem respiration determines netcosystem carbon exchange.

TL;DR: In this article, the authors presented CO2 flux data from 18 forest ecosystems, studied in the European Union funded EUROFLUX project, and observed a significant correlation was observed between annual soil respiration (SR) and gross primary productivity (GPP) among the relatively undisturbed forests.

TL;DR: In this paper, seasonal patterns of gross primary productivity (FGPP), and ecosystem respiration (FRE) of boreal and temperate, deciduous and coniferous forests, Mediterranean evergreen systems, a rainforest, temperate grasslands, and C3 and C4 crops were analyzed.

TL;DR: In this paper, seasonal patterns of net ecosystem carbon exchange (FNEE) using eddy covariance data of the FLUXNET data base ( http://www-eosdis.ornl.gov/FLUXNET ).

TL;DR: In this article , the authors explored for an association between the pheomelanin content of feathers in 35 breeding birds from 13 phylogenetically diverse species and 29 locations in Iceland, and the sulfur content of nearby soil samples.