Kovbasa Y. Mortmass of birch forests in Chernigiv region

The methodical approaches to complex research of mortmass components in birch forests of Chernihiv region are shown. Presented the general characteristics of snags mortmass, logs, falling off the branches according to destruction classes. Shown the peculiarities of organic matter formation and accumulation of deadstanding Betula pendula Roth. It was established that in birch woods logs mortmass begins to form in the middle age of 9–10 years and gradually increases from 0.1 t·ha^-1, in young stands up to 9.0t·ha^-1, in mature modal plantations, subsidence of rough branches mortmass in plantations of weeping birch is formed mainly between the ages of 14–16 years and can be increased with age from 0,1 to 3.0 t·ha^-1. The data of litter mortmass in birch forests, which in the conditions of the Chernigiv region could be 6.0–7.5 t·ha^-1 of completely dry matter. There are in the structure of litter mortmass are more than 80 % of absolutely dry matter is accounted on foliage. There is developed normative reference information for the evaluation components of the aboveground birch forests mortmass in a completely dry state, regulatory and reference materials for the evaluation of the deposited carbon in snags mortmass, logs, in rough branches mortmass and litter, as well as the regulatory tables for the evaluation of the energy content in snags mortmass, logs and rough branches mortmass.