[Effect of fires on phytomass and primary production dynamics of the mesotrophic undershrub-sphagnum bog in the Amur region].

Abstract

Data are presented on the dynamics of phytomass and primary production of the undershrub-sphagnum bog. Comparison of productivity parameters in sites with unimpaired and bumt-out vegetation is used as a method of analysis of the phytocenosis functioning during its 6-year recovery after a fire. Net primary production varied from 4.9 to 9.6 tons/ha • yr in the unimpaired bog site and from 5.3 to 15.1 tons/ha • yr in the burnt-out one. By the end of the fifth year of recovery, the phytocenosis fully compensated the loss of carbon due to the fire, mainly at the expense of roots production. Recurrent fires have a result of more profound changes in phytomass structure and reduction of primary production.