Biological Activity of Soils in Mountain Tundra Ecosystems under Postpyrogenic Restoration
| Autor: | L. A. Pozdnyakov, E. I. Kopeina, O. A. Maslova, M. N. Maslov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Denitrification
Soil organic matter Soil Science 04 agricultural and veterinary sciences Mineralization (soil science) 010501 environmental sciences 01 natural sciences Tundra Podzol Soil respiration Environmental chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Ecosystem 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Eurasian Soil Science. 51:692-700 |
| ISSN: | 1556-195X 1064-2293 |
| Popis: | The dynamics of the content and microbiological transformation of carbon and nitrogen compounds in the surface horizons of mountain tundra soils are considered in the postpyrogenic succession. The contents of total and labile carbon and nitrogen increase in the course of postpyrogenic soil evolution. At the same time, in the surface organic horizons, the carbon reserves, as compared to the nitrogen ones, are restored faster. The aerobic transformation of carbon compounds prevails at all the stages of the succession. The tolerance of soil organic matter toward mineralization increases as the ecosystem recovers after fire. However, this parameter reaches the values characteristic of the control soils no earlier than 60 years after the fire. The microbial communities of the podburs (Folic Podzols, Haplic Podzols) restore their functional activity fast enough after the fire (about three years). In the remote future, the effect of fire leads to an increase in the availability of soil nitrogen and in the soil ability to fix atmospheric nitrogen. Despite the temporary increase in the availability of mineral nitrogen (including nitrates) at early stages of the postpyrogenic restoration of soil systems, denitrification does not play a significant role in the biogeochemical cycle of nitrogen. |
| Databáze: | OpenAIRE |
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