Effect of nitrogen addition on soil CO2 efflux and fine root biomass in maple monocultures of the hyrcanian region

Nitrogen (N) addition (10 and 15 g N m −2 year −1 as dissolved $${\mathbf{N}\mathbf{H}}_{4}{\mathbf{N}\mathbf{O}}_{3}$$ ) significantly increased the CO 2 efflux from forest soil fine root biomass in a maple (Acer velutinum Bioss.) plantation. Following seasonal pattern, showed an exponential relationship with temperature. The effect of atmospheric deposition on CO2 is still unclear Hyrcanian forests has received considerable attention context global climate change. Aims this study were to determine how change after Since wet these areas 3–5 m−2 year−1, four treatments including N1 (5 year−1), N2 N3 (15 N0 (control) selected. Twelve plots × 20 m) established, $${\mathrm{NH}}_{4}{\mathrm{NO}}_{3}$$ solution was sprayed monthly below trees’ canopy for 1 year. Soil temperature, moisture, measured static dark closed chambers. Fine seasonally by sampling at same depth. affected different levels addition. addition, displayed highest rate (174 ± 16.1 mg CO2-C h−1). N3. predicted such plantations will probably lead enhanced soils reforested close industrial sites forest.