Petru to achieve the proposed goal, 10 beech trees and 10 fir trees will be harvested from different categories of diameters, covering all diameter ranges, with the aim of developing allometric equations necessary for the calculation of total biomass. Trunk biomass will be calculated as the product of wood density and trunk volume. To estimate the biomass of twigs and foliage, the grasping diameter of the twigs will be measured and all leaves/needles will be collected. All these plant parts will be dried in an oven and weighed.
For the biomass of thick roots, the stumps will be excavated, and for the fine ones, samples will be taken with a metal probe. Allometric relationships will be established between the biomass of the trunk, branches, foliage, reproductive organs, stump, thick roots and several tree characteristics: diameter at 1.30 m, crown height and length. At the beginning of 2018, an inventory of living trees will be carried out. The data resulting from the inventory, together with the allometric equations, will be used to calculate the above- and below-ground biomass for the entire tree. net primary production will be calculated for a growing season as the difference between the biomass at the beginning and the end of the growing season.
The amount of C will be determined at different levels of the forest: soil, litter and for each part of the plant. To determine the C content of the plant material, parts of the tree will be sampled: thick and fine roots, trunk, branches, leaves.
The results of this project will provide valuable data on above- and below-ground biomass, but also on the amount of C that is stored in plant organs, litter, soil in a virgin mixed forest.