Open AccessMODELING OF THE CARBON AND NITROGEN CYCLES OF TUNDRA IN THE HOLOCENE
Author(s) -
M. M. Arzhanov
Publication year - 2020
Publication title -
èkologiâ. èkonomika. informatika. tom 1: sistemnyj analiz i modelirovanie èkonomičeskih i èkologičeskih sistem
Language(s) - English
Resource type - Journals
ISSN - 2500-395X
DOI - 10.23885/2500-395x-2020-1-5-15-20
Subject(s) - tundra , environmental science , permafrost , atmospheric sciences , ecosystem , greenhouse gas , carbon cycle , atmosphere (unit) , climatology , vegetation (pathology) , nitrogen , carbon fibers , ecology , chemistry , geology , oceanography , meteorology , geography , materials science , organic chemistry , pathology , composite number , composite material , biology , medicine
The observed increase in near-surface temperature can cause degradation of permafrost and an increase in greenhouse gas emissions. At the same time, the productivity of the tundra increases, and more intense photosynthesis means an increase in the absorption of carbon from the atmosphere. Therefore, the development of models of the carbonnitrogen cycle to study the contribution of tundra ecosystems is a special challenge. In this work, the modeling of carbon and nitrogen dynamics in tundra ecosystems of northern regions of Western Siberia were carried out using the reservoirflow model including vegetation, organic carbon compounds, dissolved organic and inorganic nitrogen. Input data of the atmospheric forcing were set according to the results of calculations with CLIMBER-2 model for the last 10 thousand years. Model estimates show a regional increase in mean annual air temperature and a decrease in the annual range over a period of 10–5.5 thousand years ago due to an increase in winter temperatures in this region. According to the results of calculations, carbon stocks in soil increase monotonically during the period under consideration. Calculated soil C values for modern climatic conditions are 14700 gC/m2 . The reserves of nitrate and ammonium forms of nitrogen are stabilized at the beginning of the calculation period. The results of calculations show that tundra ecosystems within the last 10 thousand years, including those under conditions of near-surface warming with increasing winter temperature and minor changes in summer temperature could accumulate organic matter, absorbing carbon-containing greenhouse gases from the atmosphere.