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| Titel |
Soil CO2 emission of different ecosystems and soil microbial community respiration (European Russia) |
| VerfasserIn |
Sofia Sushko, Nadezhda Ananyeva, Kristina Ivashchenko, Vyacheslav Vasenev |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139123
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| Publikation (Nr.) |
 EGU/EGU2017-2301.pdf |
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| Zusammenfassung |
| Soil CO2 emission is mainly provided by soil microorganisms and plant roots respiration.
Our study focuses on finding a relationship between soil CO2 emission of different
ecosystems and soil microbial community functioning. Soil CO2 emission was monthly
measured (LI-820) from May to October 2015 in the 5-th spatially distributed points of
forest, meadow (steppe), arable (bare fallow), urban of subtaiga and forest-steppe vegetation
subzones (Albeluvisol and Chernozems, Moscow and Kursk regions, respectively). Soil
microbial biomass carbon (Cmic, substrate-induced respiration method), basal respiration
(BR), organic carbon content (Corg), pHw and soil C/N ratio were measured in soil samples
(0-10 cm, litter excluded, n = 240). Specific respiration of soil microbial biomass (qCO2) was
calculated as BR / Cmic. Soil CO2 emission of different ecosystems was ranged 0.2-87.4 and
1.1-87.9 g CO2 m−2 d−1 for subtaiga and forest-steppe, respectively. It was reached on
average 20.5, 33.5, 3.8, 28.4 and 15.0, 23.8, 3.7, 15.3 g CO2 m−2 d−1 for forest,
meadow, arable, urban of subtaiga and forest-steppe, respectively. The high soil CO2
emission was found in grassland ecosystems, the low – in arable, however it was
quite high in urban. Soil organic carbon content of different ecosystems was ranged
1.0-3.3% and 1.4-3.7%, pH was 4.7-7.6 and 6.1-8.2, C/N = 10.8-16.0 and 12.0-18.1 for
subtaiga and forest-steppe, respectively. Soil Cmic of different ecosystems was ranged
60-1294 and 178-2531 μg C g−1 for subtaiga and forest-steppe, respectively. The
Cmic of forest, meadow, arable, urban in subtaiga and forest-steppe was reached
on average 331, 549, 110, 517 and 1525, 1430, 320, 482 μg C g−1, respectively.
Soil BR of different ecosystems was ranged 0.14-2.23 and 0.15-2.80 μg C-CO2
g−1 h−1 for subtaiga and forest-steppe, respectively. Moreover, the BR of forest,
meadow, arable, urban in subtaiga and forest-steppe was on average 0.87, 0.92, 0.42,
0.47 and 1.20, 1.42, 0.33, 0.64 μg C-CO2 g−1 h−1, respectively. The qCO2 value
was ranged 0.55-8.22 and 0.39-2.64 μg C-CO2 mg−1 Cmic h−1 for subtaiga and
forest-steppe, respectively. The qCO2 of forest, meadow, arable, urban in subtaiga
and forest-steppe was on average 3.12, 1.86, 3.84, 0.95 and 0.83, 1.03, 1.08, 1.45
μg C-CO2 mg−1 Cmic h−1, respectively. Soil CO2 emission of subtaiga different
ecosystems was correlated with Corg, Cmic and qCO2 (r = 0.60, 0.59 and -0.64,
respectively, p <0.01) and its spatial-temporal variability was explained by 35 and
41% of Cmic and qCO2 (p <<0.001), respectively. However, soil CO2 emission of
forest-steppe was correlated only with BR (r = 0.57, p <0.01), this was explained by
33% of emission’s variation (p <<0.001). Thus, soil CO2 emission in subtaiga
different ecosystems might be predicted by Cmic, and in forest-steppe it was by
BR.
Current research was partially sponsored by RFBR grants Nos. 15-04-00915 and
15-34-00398; Russian Academy Program “Biodiversity” No. 29. |
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