Multimodal and multimodel approach for estimation of soil organic carbon in agroecosystems

Miss Olga Sukhoveeva1

1Institute of geography RAS, Moscow, Russian Federation

We offer to use a complex multimodal approach including carbon calculators and simulation models to estimate soil organic matter in agroecosystems. These mathematical methods may help to evaluate content of soil carbon and CO₂ emission from each type of landscapes and forecast changes of carbon pools and fluxes.

We had approbated our method on the base of the Central Forest zone as one of the most important agricultural and economical regions of Russia. Taking into account soil type and growing crops in different administrative units, we distinguished 20 agrolandscapes over the period of 1990-2017. Totally 560 conceptual experiments were designed.

Calculators evaluate carbon balance or footprint in online regime. Unfortunately, they consider only anthropogenic factors, their coefficients in formulas can’t be corrected. We used Ex-ante carbon-balance tool (EX-ACT), Farm Carbon Cutting Toolkit (FCCT), Cool Farm Tool (CFT).

Models involve both natural and anthropogenic input and output parameters of carbon cycle. We used RothC (Rothamsted Carbon model) and DNDC (DeNitrification-DeComposition), parametrized them according to local arable soils conditions using official statistical information and data taken from published sources. Results of multimodel estimation were verified against data of field experiments; modelled values were successfully compared with measurements.

The dynamics of organic carbon in soil depends on features of growing crops and input of organic fertilizers. In the northern regions (Kostroma, Tver) spring barley and oat are dominated, and the losses of organic carbon from soil are typical due to absence of organic fertilizers in cropping technologies. In central regions (Moscow, Kaluga, Yaroslavl) highly productive winter wheat and potato are grown. They are characterized by use of great amount of fertilizers resulting in general accumulation of carbon in the soils.

The research was supported by Fundamental scientific research theme 01201352499 (0148-2018-0006) and Fundamental research program of Presidium of RAS No 51 (0148-2018-0036).


Biography:

PhD in Geography; Junior researcher at the Laboratory for anthropogenic changes in the climate system; Institute of Geography, Russian academy of sciences. She is the author of more than 50 scientific publications. Area of research involves application of mathematical methods in geography including statistical and simulation modelling biogeochemical cycles of carbon and nitrogen in terrestrial ecosystems and evaluation of regional climate change and its impact on agriculture.

SOIL ORGANIC MATTER

7th International Symposium
Soil Organic Matter

6 – 11 October 2019

Hilton Adelaide

Adelaide, South Australia

Australia

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