Journal of Food, Agriculture and Environment
Vol 11,
Issue 3&4,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Carbon and nitrogen balances in soil under SRC willow using the DNDC model
Author(s):
Magdalena Borzęcka-Walker 1*,
Robert Borek 1, Antoni Faber 1, Rafał Pudełko 1, Jerzy Kozyra 1, Alina Syp 1, Mariusz Matyka 2Recieved Date: 2013-05-08, Accepted Date: 2013-09-04
Abstract:Unsustainable production of agricultural biomass for electricity and heat can increase greenhouse gas emission and nitrates leaching. The DNDC (DeNitrification and DeComposition) model was used to estimate carbon sequestration and field losses of nitrogen, especially N2O emission in willow production. The model is capable of predicting willow yields with a relatively low error (RRMSE = 11.5%). DNDC estimated a significant carbon sequestration under willow (1.41-4.11 Mg eq. CO2 ha-1 yr-1). The N2O field emissions generated by the DNDC model were compared with IPCC Tier 1 emission estimates. The average annual N2O emission generated by the model was 3.7 kg N ha-1 (1.35% of nitrogen available for plant); whereas N2O emission using IPCC methodology was insignificantly lower (3.5 kg N ha-1). Nitrate leaching was at a range of 8.96-21.24 kg N ha-1 yr-1. We did not find a statistically significant relationship between the annual soil carbon growth and nitrogen losses from soil. An analysis into the sensitivity of the model indicated a considerable influence of precipitation on NO3- leaching (99% of variability) as well as a strong relationship between temperature and precipitation inputs and N2O emission. The DNDC model is a useful tool in the assessment of carbon and nitrogen balance in soil under SRC willow.
Keywords:Willow,
DNDC, soil carbon, greenhouse gas, nitrous oxide, nitrates leachingJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1920-1925
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