Neverov N.A., Belyaev V.V., Chistova Z.B., Kutinov Y.G., Staritsyn V.V., Polyakova E.V., Mineev A.L. (2017): Effects of geo-ecological conditions on larch wood variations in the North European part of Russia (Arkhangelsk region). J. For. Sci., The present study examines the macrostructure and density of larch wood and possible influences on the productivity of larch stands. The studies were conducted in the middle and sub-tundra taiga in the Arkhangelsk region. The selected trees were of the same age and diameter at breast height. In all sample plots the average annual ring width varied from 0.68 to 0.93 mm, the average content of latewood was about 29.7-35.1% and the average wood density of these old Siberian larch trees was 572 (500-698) kg·m -3 . There were no significant differences between sample plots in terms of the latewood content, density and annual ring width of the growth rings. Wood macrostructure of larch wood has the same values in forests growing in the sub-tundra and middle taiga. A possible explanation for this is the location of these stands in the karst landscape, which possesses abundant mineral nutrition. Geological factors are surpassing the influence of climatic factors and contribute to the formation of productive larch stands in the subtundra taiga in the European part of Russia.

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Changes in the absorbed dose rate of external and internal exposure of the representatives of fish fauna of the cooling pond of the Chornobyl NPS and Lake Azbuchyn after the interruption of water supply into the cooling pond at the end of 2014 were investigated in 2014-2021. Changes in hydrological regime resulted in the decrease in water level in the cooling pond by 6.5-7.0 m, whereas in Lake Azbuchyn - by 2.5-3.0 m. In this case, ⁹⁰Sr concentration activity in the water and biota increased. It has been found that in 2021 dose load from the incorporated ⁹⁰Sr on fish of the cooling pond increased on the average by a factor of 4.5, whereas in Lake Azbuchyn - by a factor of 7.5 as compared to previous period (prior to a decrease in water level). The external dose rate for fish of the cooling pond remained almost unchanged, whereas in Lake Azbuchyn it increased as a result of replacing littoral and sub-littoral zones of the lake with the sections of the bottom characterized by an essentially higher level of radio-nuclide contamination.

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