Биологическая продуктивность естественных сосняков Северной Евразии: элементы географии

The geographic patterns of distribution of biomass and net primary production (NPP) of natural pine forests in the Northern Eurasia are analyzed; they determine the energy potential and are the most important criteria of the quantitative evaluation of forest functioning. For this purpose, databases of the biomass and NPP of natural pine forests consisting of 1223 and 316 definitions respectively on the sample plots established in the area from the Western Europe to Japan was compiled. The first database includes 1202 definitions for Pinus sylvestris L. (provinces: Central European, Scandinavian-Russian, the East of Russian Plain, Urals, West Siberian, Central Siberian, East Siberian, Trans-Baikal, Altai-Sayan), 11 for P. nigra Arn. (Central European province), 2 for P. pinaster (Sol) Ait. (Central European province); 5 for P. hamata D. Sosn. (Black Sea province) and 3 for P. densiflora S. et Z. (Japan). The second database includes 313 definitions for Pinus sylvestris, 2 for P. hamata and 1 for P. pinaster. A technique of geographical data analysis has been developed, namely, the procedure of reduction of the biomass and NPP data of the Northern Eurasia to a comparable form, followed by the identification of their geographic distribution patterns using the method of block dummy variables that are included in the multifactorial equation of biomass or NPP together with volume forming independent variables. It is found that the biomass and NPP of natural pine forests in Northern Eurasia at the statistically significant level are decreasing from South to North, as well as from the Atlantic and Pacific coasts to the continentality pole in Yakutia.