ЭлБиб

Молочнохозяйственный вестник, №4 (24), IV кв. 2016

211

рефераты

прибрежной полосе, что отрицательно влияет на защитные функции насаждений.

Summary

The aim of the research is silvicultural and economic assessment of the European

beaver’s (castor fiber) activity. The objects of the research have been the stands

growing on the banks of the Pungul river populated by beavers. Silvicultural and forest

inventory research works have been done according to existing standards (state and

industry standards), and methodological guidelines. Economic damage calculation has

been done as follows: at first we have defined the volume of trees fallen as a result of

the European beaver’s activity, then we have established the volume of dead-wood,

that is the wood which has moved from commercial timber to the category of firewood.

In calculating the economic damage the recommendations from the RF Government

decision no. 273 of 05.08.2007 have been considered, and the stumpage value has

been defined according to the RF Government decision no. 310 of 22.05.2007. As a

result of the research it has been stated that the European beaver’s activity changes

the stand considerably. Appearing of such elements as dams makes for the increase in

water level in the river and leads to waterlogging. Due to this many trees dry up and

move from commercial timber to firewood category. Meanwhile both birch-trees and fir-

trees dry up. However fir-trees suffer more. So, the quantity of dried up fir-trees on the

first test area amounted to 88%, and on the second test area it was 93%. As a result of

this the cost of the standing timber decreases on average by 30%. Furthermore, due to

damaging fodder trees, their species composition, allocation and quantity is changing.

In our case on two test areas 59 trees, from the smallest to the biggest, were nibbled

at. The total economic damage from the European beaver’s activity consists of losses

caused by drying up stands and losses from “illegal cutting” of trees and amounts to

116649 rubles per hectare. All fallen and dried up tree species are in a narrow strip near

the river which negatively effects the protective function of the stands.

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