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| Titel |
Soil microbial respiration (CO2) of natural and anthropogenically-transformed ecosystems in Moscow region, Russia |
| VerfasserIn |
Kristina Ivashchenko, Nadezhda Ananyeva, Sofia Rogovaya, Viacheslav Vasenev |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250121813
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| Publikation (Nr.) |
 EGU/EGU2016-663.pdf |
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| Zusammenfassung |
| The CO2 concentration in modern atmosphere is increasing and one of the most reasons of it
is land use changing. It is related not only with soil plowing, but also with growing
urbanization and, thereby, forming the urban ecosystems. Such conversion of soil cover might
be affected by efflux CO2 from soil into atmosphere. The soil CO2 efflux mainly supplies by
soil microorganisms respiration (contribution around 70-90%) and plant roots respiration.
Soil microbial respiration (MR) is determined in the field (in situ) and laboratory (in
vitro) conditions. The measurement of soil MR in situ is labour-consuming, and for
district, region and country areas it is difficult carried. We suggest to define the
MR of the upper highest active 10 cm mineral soil layer (in vitro) followed by the
accounting of area for different ecosystems in large region of Russia. Soils were sampled
(autumn, 2011) in natural (forest, meadow) and anthropogenically-transformed (arable,
urban) ecosystems of Sergiev-Posad, Taldom, Voskresenk, Shatura, Serpukhov
and Serbryanye Prudy districts in Moscow region. In soil samples (total 156) the
soil MR (24 h, 22∘C, 60% WHC) were measured after preincubation procedure (7
d., 22∘C, 55% WHC). The soil MR ranged from 0.13 (urban) to 5.41 μg CO2-C
g-1 h-1 (meadow), the difference between these values was 42 times. Then, the
soil MR values (per unit soil weight) were calculated per unit soil area (1 m2), the
layer thickness of which was 0.1 m (soil volume weight was equaled 1 g cm-3).
The high MR values were noted for forests soil (832-1410 g CO2-C m-2 yr-1)
of studied districts, and the low MR values were for arable and urban soils (by
1.6-3.2 and 1.3-2.7 times less compared to forests, respectively). The MR rate of
urban soil in Voskresenk district was comparable to that of corresponding meadows
and it was even higher (in average by 2.3 times) in Serpukhov district. The soil
MR rate of studied cities was higher by 20%, than in corresponding arable soils
(438-517 g CO2-C m-2 yr-1). Furthermore, we took into account the area of different
ecosystems, which achieves 47% for forests, 6, 30 and 5% for meadows, arable and cities,
respectively, of total area in studied districts. It turns that the soil MR of forests area was
highest reaching 281-1391 thousand tons CO2-C yr-1. The soil MR of meadows area
was reached 15-76 thousand tons CO2-C yr-1, that was by 1.6-2.7 times lower
than those in cities of the most urbanized districts (Sergiev-Posad, Voskresenk and
Serpukhov). Suggested approach allows us to compare soil MR (main biogenic
CO2 source) of different ecosystems’ area in Moscow region. It was shown that
urban soils might be significant source of CO2 in atmosphere, therefore they should
be taken into account for balance calculation of carbon cycle, and especially at
regional level. This approach might useful for express assessment of microbial
soil CO2 efflux, soil ecological monitoring, and predictive estimation of soil CO2
efflux for a wide range of ecosystems, including human activities disturbed ones. |
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