SPECIFICITY OF DISTRIBUTION OF MACROCELLS IN PARTS OF WOOD PLANTS OF SPRUCE-FIR FORESTS IN THE REPUBLIC OF MARI EL
Specificity of accumulation and distribution of macroelements in various parts of the basic wood species of spruce and fir plantations in Mari El Republic is revealed. The list of the minimum values of the ash elements content in the needles of the current year of Picea abies and Abies sibirica trees is made, the values are sufficient for optimum nutrition in the middle-aged spruce and fir plantations. It is shown that such hardwoods as Tilia cordata and Betula pendula are good companions of the conifers. The leaf fall of the trees which contains a significant amount of nitrogen, potassium and phosphorus improves soil fertility of the spruce and fir forests.