Assessment of reserves of aboveground phytomass and carbon depositing capacity of pine stands in urban forests of Yekaterinburg

In the course of the conducted studies, the forest databases at stand level for all categories of forest stands of the city of Yekaterinburg, namely, the federal, regional and municipal subdivision were modernized. The database includes a total of 22,098 forest units, including 9,245 forest units with some proportion of pine in their stands. The aboveground phytomass stocks of pine stands by the following fractions: tree stems, crowns and needles were calculated for all these forest stands on the basis of multifactor mathematical models. The tree stem models used the quality of growing conditions (mean height at 100 years), age and stock of tree stands as independent variables; and the crown tree models use the first two factors and mean area of tree feeding (density of tree). It was established that the total stock of aboveground phytomass of pine stands in absolutely dry condition on the territory of the municipal formation ‘Yekaterinburg city’ is 4,426.1 thousand tons. The pine stand phytomass per hectare in municipal urban forests averaged 114.7 t/ha, compared to 117.2 t/ha in regional subordinated forests and 123.4 t/ha in federal subordinated forests. These insignificant differences are explained by the peculiarities of the taxation structure of stands in urban forests under different subordinations. It is revealed that the total amount of carbon deposited in the aboveground phytomass of pine stands in the municipality is 2,114.2 thousand tons. 1,739.5 thousand tons of carbon (82.3% of the total) were accumulated in tree stems and 374.7 thousand tones (17.7%) in crowns. The mean carbon stock in aboveground phytomass of pine elements of stands per hectare is 57.9 t/ha. The minimum value of this indicator (54.8 t/ha) is typical for urban forests of regional subordination, and the maximum (58.9 t/ha) is for urban forests of federal subordination.

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