Removal of carbon and mineral nutrients upon clear felling of spruce forests in the middle taiga

摘要

We obtain an estimate of the influence of localized clear felling in a middle taiga spruce forest on the dynamics of organic mass and its content of carbon and elements of mineral nutrition. In an old-age myrtillus bilberry moist spruce stand, in which the reserve of organic mass is 180 t ha(-1), there are concentrated 86 t of carbon, 508 kg of nitrogen, and 904 kg of ash elements. On the logging area of this spruce forest in the undercut (incomplete felling), roots, and logging slash, there are 112 t ha(-1) of phytomass, where 53 t C ha(-1), 308 kg of nitrogen, and 723 kg of ash elements are concentrated. Upon the localized clear felling with removal of tree-length logs, the loss of carbon is 44%, nitrogen 28.3%, and ash elements 22.3% of their overall reserve in the myrtillus moist spruce stand. In the spruce-sphagnum forest, the phytomass of the stand is 194 t ha(-1) and contains 92 t ha(-1) of carbon, 580 kg of nitrogen, and 974 kg of ash elements. Upon cutting of the stand in this spruce forest, 77 t ha(-1) of organic mass were taken away, including 37 t of carbon, 140 kg of nitrogen, and 215 kg of ash elements, which are 39.5, 24.2, and 22% of their overall mass in woody plants of the cenosis, respectively.