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| Titel |
Carbon balance of the typical grain crop rotation in Moscow region assessed by eddy covariance method |
| VerfasserIn |
Joulia Meshalkina, Alexis Yaroslavtsev, Ivan Vassenev |
| 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 |
250147988
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| Publikation (Nr.) |
 EGU/EGU2017-12212.pdf |
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| Zusammenfassung |
| Croplands could have equal or even greater net ecosystem production than several natural
ecosystems (Hollinger et al., 2004), so agriculture plays a substantial role in mitigation
strategies for the reduction of carbon dioxide emissions. In Central Russia, where agricultural
soils carbon loses are 9 time higher than natural (forest’s) soils ones (Stolbovoi, 2002), the
reduction of carbon dioxide emissions in agroecosystems must be the central focus of the
scientific efforts.
Although the balance of the CO2 mostly attributed to management practices, limited
information exists regarding the crop rotation overall as potential of C sequestration.
In this study, we present data on carbon balance of the typical grain crop rotation in Moscow
region followed for 4 years by measuring CO2 fluxes by paired eddy covariance stations
(EC).
The study was conducted at the Precision Farming Experimental Fields of the Russian
Timiryazev State Agricultural University, Moscow, Russia. The experimental site has a
temperate and continental climate and situated in south taiga zone with Arable
Sod-Podzoluvisols (Albeluvisols Umbric).
Two fields of the four-course rotation were studied in 2013-2016. Crop rotation
included winter wheat (Triticum sativum L.), barley (Hordeum vulgare L.), potato crop
(Solanum tuberosum L.) and cereal-legume mixture (Vicia sativa L. and Avena
sativa L.). Crops sowing occurred during the period from mid-April to mid-May
depending on weather conditions. Winter wheat was sown in the very beginning
of September and the next year it occurred from under the snow in the phase of
tillering.
White mustard (Sinapis alba) was sown for green manure after harvesting winter wheat in
mid of July.
Barley was harvested in mid of August, potato crop was harvested in September.
Cereal-legume mixture on herbage was collected depending on the weather from early July to
mid-August.
Carbon uptake (NEE negative values) was registered only for the fields with winter wheat and
white mustard; perhaps because the two crops were cultivated on the same field
within one growing season. Other cases showed CO2 emission. NEE for barley field
was equal to zero or even positive during the whole year; considering only the
growing season, NEE for barley was about 100 g C m−2 lower and usually was
negative. Carbon uptake for cereals was strongly related with weather conditions:
in favorable years it was higher. Potato crop and cereal-legume mixture showed
difference in 50-100 g C m−2 per year in NEE in different years related to difference in
yields.
The total agroecosystems respiration ranged from 400 to 550 g C m−2 per year and was
closely linked to weather conditions.
Closed balance for whole years showed that carbon losses were observed for all studied
agroecosystems. It was minimal for fields with winter wheat, with mustard, used as green
manure, and it was maximal for fields with cereal-legume mixture.
Values about 200-250 g C m−2 per year may be considered as estimated values for the total
carbon loss for the typical grain crop rotation in Moscow region. The use of mustard as a
green manure reduced this value by three-quarters. |
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