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CYKL
BIOGEOCHEMICZNY AZOTU
W GLEBACH
EKOSYSTEMÓW BORÓW IGLASTYCH
Marta A. Stremińska,
Mieczysław Błaszczyk
1. Wstęp.
2. Zasoby azotu w glebach borów sosnowych 3. Dopływ
związków azotu do gleby ekosystemów borowych. 4. Azot w
materii organicznej gleby ekosystemu borowego. 5. Etapy
mineralizacji azotu w glebie boru sosnowego. 6. Zmiany w
cyklu biogeochemicznym azotu zachodzące w wyniku zakłócenia
równowagi ekologicznej pod wpływem czynników naturalnych lub
działalności człowieka. 7. Podsumowanie
Biogeochemical cycle of nitrogen in the soils of
coniferous forests
Abstract: Nitrogen is one of the most
important biogenic compounds. It is essential to facilitate
development, growth and functioning of all living organisms.
Nitrogen is found in many complex organic molecules like enzymatic
and structural proteins, nucleic acids and humic substances.
Majority of transformation processes during nitrogen biogeochemical cycle
is regulated by biological processes.
Nitrogen availability in the soils of coniferous forests, alike in all
other ecosystems, is a prerequisity of proper
functioning of this ecosystem. Soils of coniferous forests contain
large amounts of organically bound
nitrogen, but mainly in slowly decaying organic matter. Thus the
amounts of nitrogen, readily available for plants ant microorganisms, are limited.
Nitrogen biogeochemical cycle in coniferous forest soils consists
of many processes (e.g. nitrogen fixation, organic matter
decomposition, nitrification and denitrification), in which the key role is played by microrganisms, which
transform the nitrogenous compounds. The intensity of the microbial processes in coniferous
forest soil is adversely affected by not
favourable physiochemical properties of the soil (mainly low soil
pH, low concentration of easily degradable
organic matter). Plants growth and functioning depends on
efficiency of photosyntesis, in which nitrogen plays one of
key roles. Therefore it is important to study the nitrogen
biogeochemical cycle in
ecosystems limited by the availability of this element. Better
understanding of mechanisms regulating the
biochemical processes in coniferous forest soils will create
possibility of choosing right strategies of forest management.
This will facilitate design of appropriate methods to increase
forest productivity without undesired disruptions of
natural proccesses and environmental pollution.
1. Introduction.
2. Nitrogen resources in coniferous forest soils. 3. Input
of nitrogenous compounds into
the pine forest soils. 4. Nitrogen in soil organic matter. 5. Nitrogen
mineralization stages in pine forest soil. 6. Changes in
biogeochemical cycle of nitrogen resulting from natural and
anthropogenic disturbances of
ecological balance. 7. Summary
Słowa kluczowe: azot, bory sosnowe, cykl biogeochemiczny
Key words:
nitrogen, pine forests, biogeochemical cycle
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