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| Titel |
Influence of different kind of peats on some physic-chemical properties, biochemical activity, the content of different forms of nitrogen and fractions of humic substances of The Great Vasyugan Mire |
| VerfasserIn |
L. I. Inisheva, L. Szajdak |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030180
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| Zusammenfassung |
| Mires, or peatlands belong to the wetlands ecosystems where carbon is bounded in primary
production and deposited as peat in water saturated, anoxic conditions. In those conditions,
the rate of the supply of new organic matter has exceeded that the decomposition, resulting in
carbon accumulation.
Place of sampling belongs to an oligotrophic landscapes of the river Klyuch basin in spurs
of Vasyugan mire. The catchment represents reference system for Bokchar swampy
area (political district of Tomsk region). Landscape profile crosses main kinds of
swampy biogeocoenosis (BGC) toward the mire center: paludal tall mixed forest,
pine undershrub Sphagnum (high riam, trans-accumulative part of a profile, P2),
pine-undershrub Sphagnum (low riam, transit part, P3), sedge-moss swamp (eluvial part,
P5).
The latter represents an eluvial part of a slope of watershed massif where it is
accomplished discharge of excess, surface, soil-mire waters. The depth of peat deposit of
sedge-moss swamp reaches 2,5m. To the depth of 0,6m there is a layer of Sphagnum raised
bog peat, then it is a mesotrophic Scheuchzeria Sphagnum layer and at the bottom there is a
thick layer of low-mire horsetail peat.
The samples of peats were taken from two places (P2 and P3), both from the depth 0-75
cm of the great Vasyugan Mire. These materials represent (P2) Sphagnum fuscum peat (ash
content ranged from 10.8 to 15.1%), but samples P3 belong to low-moor sedge peat (ash
content ranged from 4.5-4.8%).
The differences in water level, redox potential, pH, degree of degradation, bulk density,
number of microorganisms, activity of enzymes, different kinds of nitrogen and humic
substances were studied in two different peat soils characterized by different type of
peat.
In general in P2 the redox potential changed from 858 to /-140/ mV, higher activity of
xanthine oxidase and peroxidase, different kinds of microorganisms (ammonifing bacteria
and cellulose decomposing microorganisms) and different kinds of nitrogen (mineral, easily
hydrolysable, hardly hydrolysable and non-hydrolyzable), bitumines, 3 fractions of humic
acids and 3 fractions of fulvic acids were determined in the deep 0-25 cm than in 50-75 cm.
The ratio HA/FA in the depth 0-25 cm was equal to from 1.87, but in the depth 50-75 cm was
equal to 7.66.
Contrary was observed for P3. For this peat with the increase of the deep of sampling the
decrease of total nitrogen, activity of enzymes (xanthine oxidase and peroxidase) is
connected with the changes of Fe+2/Fe+3 and lower difference of redox potential than in P2.
The ratio HA/FA in the depth 0-25 cm was equal to 0.56, but in the depth 50-70 cm was equal
to 0.84. |
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