During the last two centuries, agriculture and the burning of fossil fuels have increased significantly the global pollutions and deposition of nitrogen compounds. Atmosphere nitrogen depositions influence on function of the natural habitat and limited nitrogen nutrition forests have particularly strong disturbance. The aim of our study was to assessment of effect of mineral nitrogen (Nmin) deposition on plant, soil and microbial properties of forests. The areas with high deposition of nitrates (N-NO3) - Moscow region and ammonium (N-NH4) - Vologda region and further with low deposition of these (Kostroma region) were selected. For the assessment of atmospheric deposition Nmin snow samplings were collected. The soil sampling (depth 0-20 cm) was done at the same sites where the snow was collected. The vegetation survey included the assessment of the abundance of plant species in the percentage of vegetation cover on the plots (20 m2) and the separation of species on trophic groups. Determination of the concentration of Nmin, N-NH4, N-NO3 in snow and soil samples was carried out. In the soil was determined total nitrogen (Ntot), total carbon (Ctot), pH, texture, as well as carbon of the microbial biomass (Cmic), basal (microbial) respiration (BR) and the microbial metabolic quotient (BR/Cmic = qCO2). It revealed that, the deposition of N-NH4 determines change of soil properties: increase the concentration of N-NO3 and Cmic, decreases the C/N ration, but deterioration in the functioning of microbial communities (higher qCO2). Nitrate influence on the increase in the abundance of nitrophilic species in ground cover.
Irina Kudrevatykh, Russian Academy of Sciences, Russia
Kristina Ivashchenko, Russian Academy of Sciences, Russia
Stream: Natural, Environmental and Health Sciences
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