Journal of Food, Agriculture and Environment

Simulation of soil organic carbon in long-term experiments in Poland using the DNDC model

Author(s):

Alina Syp *, Antoni Faber, Magdalena Borzęcka Walker

Recieved Date: 2012-07-02, Accepted Date: 2012-09-30

Abstract:

In this paper, simulations with a Denitrification – Decomposition (DNDC) model were used to evaluate the impact of different management options on carbon (C) sequestration and emission of greenhouse gases: methane (CH₄) and nitrous oxide (N₂O). Two cropping systems were analyzed. The first included potato, winter wheat, spring barley and forage maize (P-W-B-M). The second included potato, winter wheat, spring barley with clover and grass mixture (P-W-B-C). In both cropping systems, different farmyard manure (FYM) rates were applied. The application of additional nitrogen (N) using FYM increased the C sequestration, as well as N₂O emissions and had a little effect on CH₄ uptake. An estimate into the average annual increases in N₂O emissions, which were converted into carbon dioxide (CO₂) equivalent emissions with 100-year global warming potential (GWP) multipliers, were offset by 56-144% of the C sequestration, depending on the management option. After 16 years of the experiment, the accumulation of C and N per hectare increased in the soil organic matter (SOM) pool. In P-W-B-M rotation, with manure applied at 325  kg  N ha^-1, the accumulation of C increased to 5,760  and N 585 kg  ha^-1, respectively. In P-W-B-C rotation, where a higher rate of manure was applied, the increase of C was at 10,796 and N 740 kg ha^-1. The highest influence in the rise of C and N accumulation was in humates. The high value of C sequestration in soil outweighs the emissions of N₂O. In P-W-B-M rotations, the rate of applied FYM switched its average annual net GWP balance from net losses to a net sink. In P-W-B-C rotations, the applied FYM increased the annual rate of GHG emissions by 3%. The  average annual N₂O emissions increased by 44% under P-W-B-C rotation and by 142% under P-W-B-M rotations. Increases in the soil organic carbon (SOC) were by 234% and 408%, respectively, for P-W-B-C and P-W-B-M rotations. Our study showed that usage of FYM should be managed correctly, because applications at high rates have a negative impact on environment. 

Keywords:

Soil carbon sequestration, DNDC model, nitrous oxide, greenhouse gas emission, farmyard manure

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1224-1229

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