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Presents information on a study which analyzed seasonal patterns in net ecosystems exchange of a Pinus sylvestris near Zotino in central Siberia. Examination of the relationship between canopy and photosynthesis; Materials and methods; Results and discussion; Conclusions.

Presents information on a study which compared the net primary production and different mass-based estimates of net ecosystem productivity in fire-prone Siberian Scots pine forests. Methodology; Results and discussion; Conclusions.

Presents information on a study which measured the net ecosystem exchange of stages of the Abies-domainated dark taiga in central Siberia during the growing season in 2000 using eddy covariance technique. Investigation of the effect of structural and species composition on carbon balance in consecutive successional stages; Materials and methods; Results and discussion; Conclusions.

This review provides a theoretical framework and global maps for relations between nitrogen-(N)-nutrition and stomatal conductance, g[SUBs], at the leaf scale and fluxes of water vapor and carbon dioxide at the canopy scale. This theory defines the boundaries for observed rates of maximum surface conductance. G[SUBsmax], and its relation to leaf area index. A, within a range of observed maximum stomatal conductances, g[SUBsmax]. Soil evaporation compensates for the reduced contribution of plants to total ecosystem water loss at Λ &lit; 4. Thus, G[SUBsmax] is fairly independent of changes in Λ for a broad range of vegetation types. The variation of G[SUBsmax] within these boundaries can be explained by effects of plant nutrition on stomatal conductance via effects on assimilation. Relations are established for the main global vegetation types among (i) maximum stomatal conductance and leaf nitrogen concentrations with a slope of 0.3 mm s[SUP-1] per mg N g[SUP-1], (ii) maximum surface conductance and stomatal conductance with a slope of 3 mm s[SUP-1] in G per mm s[SUP-1] in g, and (iii) maximum surface CO[SUB2] uptake and surface conductance with a slope of I μmol m[SUP-2] s[SUP-1] in A per mm s[SUP-1] in G. Based on the distribution of leaf nitrogen in different vegetation types, predictions are made for maximum surface conductance and assimilation of carbon dioxide at a global scale. The review provides a basis for modeling and predicting feedforward and feedback effects between terrestrial vegetation and global climate. [ABSTRACT FROM AUTHOR]