Vertical-Fractional Structure of Aboveground Phytomass of the Tree Layer of Pine Forests in the Northern Ural Foothills (Komi Republic)

The results are presented for the vertical distribution of the aboveground phytomass in ripe and overripe pine taiga of Northern Ural foothills. The study demonstrates that the distribution of separate phytomass fractions of trees in the vertical profile of the tree layer can be described mathematically. The aboveground phytomass of pine forests can reach 17–26 m, depending on the forest type. The majority of organics is the wood biomass of the stem, which accumulates at a layer of 0–4 m above ground. The thickness of the crown layer in pine forests of different types can reach 15–26 m, while most of the assimilating apparatus are accumulated within the 8–24 m zone. An index of the leaf surface in different pine forests can reach 4.9–5.2 ha ha^–1. The vertical distribution profile depends on the structure and composition of the pine forests, although the maximum in most pine forest types is located in the uppermost part of the crowns layer.