Molochnokhozyaistvenny Vestnik

The effect of different nitrogen doses and cutting on the rate of physiological and growth processes has been studied in birch forests of blueberry type in taiga zone. It has been established that nitrogen has got little effect on the vitality and growth of spruce in mature birch forests because of the light lack. In thinned stands the nitrogen increases the rate of photosynthesis twofold, activates processes associated with the accumulation and subsequent outflow of carbon metabolites from the needles. The result of this nitrogen action is the intensification of growth processes. The most favorable conditions for the growth of the spruce undergrowth in birch forests of blueberry type in taiga zone are formed at a cutting intensity of 50% and nitrogen introduction of 180 kg / ha due to primary nutrient. Further thinning of forest stands and introduction of increased amounts of nitrogen have no significant impact on the life and growth of young spruce and only leads to more expensive works.

In birch forests of bilberry type in vegetation conditions the influence of age statement of leaf-canopy on biometrical parameters of spruce undergrowth under the Syamzhenskiy district of the Vologda region is studied. It is established that with the birch age increase the conditions for growth and development of conifer undergrowth deteriorate, as a result it changes the biomass structure, morphometrical parameters and age of under canopy needles.