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| Titel |
Impact of catchment degree on peat properties in peat deposits of eutrophic bog |
| VerfasserIn |
L. I. Inisheva, O. A. Golubina, A. V. Rodikova, N. A. Shinkeeva, A. B. Bubina |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035317
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| Zusammenfassung |
| Fundamental works of many investigators show that according to the biophysical properties
peat deposit (PD) is divided into 2 layers: active and inert. It is interesting to analyze the
supposed changes in PD of eutrophic bog according to different data (physical, chemical and
biological). The researches were carried out at two plots of one bog (points 1 and 2,
positions 56Ë 21’ NL, 84Ë 47’ EL, Russia, Siberia). Agricultural afforestation
(pine planting) was made at one of them (point 2) 60 years ago. Now this plot is
absolutely identical in ground cover to 1 point, but other conditions are significantly
changed. In spring bog water level is at the depth of 20cm at 2 point (at 1 point it
is near water face), it lows up to 53 cm during summer time (at 1 point – up to
37 cm). According to redox conditions zone of anoxic-oxic conditions reaches
meter depth at 2 points. PDs don’t significantly differ in activity of ammonifiers but
in activity of cellulose-lytic aerobic microflora it follows that it is more active at
2 point in PD active layer. In spite of good aeration, more favorable conditions
were created also for anaerobic cellulose-fermenting microflora in PD of 2 point in
comparison with 1 one. Activity analysis of denitrifying agents and microflora
of other physiological groups also showed high activity of biota at the plot with
afforestation amelioration. This fact was confirmed by high coefficient of mineralization.
Time of drainage effect created by afforestation amelioration influenced group
composition of peat organic matter which builds up PD of examined plots. According to
fractional and group composition data fracture of hard-to-hydrolyze organic matters
decreased during the process of microflora activating at the plot with afforestation
amelioration but FA content increased. Fractional composition of nitrogen showed
that content of mineral nitrogen compounds definitely increased. Thus, 60 years of
surface drainage influenced composition change of peat organic matter along all PD
profile. In our opinion, it is explained by rearrangement of qualitative and quantitative
composition of microbic biota in consequence of alternate anoxic-oxic conditions
creation along all PD of investigated eutrophic bog located in the dingle of ancient
flow.
Keywords: peat deposits, eutrophic bog, Siberia, microbiological processes, change of
organic matter.
Acknowledgements: This research was supported by RFFR (No.No. 09-05-00235,
09-05-99007), Minister of education and science (No. 02.740.11.0325). |
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