Abstract
Larch species are distributed broadly in the permafrost region of eastern Eurasia. This area may be a key to regulating global CO2 fixation and storage (Hollinger et al. 1998). Atmospheric CO2 is still increasing yearly which may have caused the increase in ambient temperature since the early 1900s (Strain 1985; Mooney et al. 1991). In fact, the ambient temperature of higher latitudes between about 45 and 70°N increased 1.4-1.8°C during the last 30 years (Kasiscnke and Stocks 2000). This temperature increase may affect growth and development of woody plants native to Central and Northeastern Siberia also, where nitrogen is considered to be a major limiting factor for tree growth (Schulze et al. 1995; Matsuura and Abaimov 2000; also see Chap. 12). Therefore, existence and fate of the Siberian taiga may depend on the condition of the permafrost by way of water and nutrient supplies (Kojima 1994; Koike et al. 1998b).
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