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Evaluating the century C model using long-term fertilizer trials in the Indo-Gangetic Plains, India

Bhattacharyya, T., Pal, D. K., Easter, M., Williams, S., Paustian, K., Milne, E., Chandran, P., Ray, S. K., Mandal, C., Coleman, K., Falloon, P., Powlson, D. and Gajbhiye, K. S. (2007) Evaluating the century C model using long-term fertilizer trials in the Indo-Gangetic Plains, India. Agriculture Ecosystems & Environment, 122 (1). pp. 73-83. ISSN 0167-8809

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To link to this item DOI: 10.1016/j.agee.2007.01.009

Abstract/Summary

The GEFSOC Project developed a system for estimating soil carbon (C) stocks and changes at the national and sub-national scale. As part of the development of the system, the Century ecosystem model was evaluated for its ability to simulate soil organic C (SOC) changes in environmental conditions in the Indo-Gangetic Plains, India (IGP). Two long-term fertilizer trials (LTFT), with all necessary parameters needed to run Century, were used for this purpose: a jute (Corchorus capsularis L.), rice (Oryza sativa L.) and wheat (Triticum aestivum L.) trial at Barrackpore, West Bengal, and a rice-wheat trial at Ludhiana, Punjab. The trials represent two contrasting climates of the IGP, viz. semi-arid, dry with mean annual rainfall (MAR) of < 800 mm and humid with > 1600 turn. Both trials involved several different treatments with different organic and inorganic fertilizer inputs. In general, the model tended to overestimate treatment effects by approximately 15%. At the semi-arid site, modelled data simulated actual data reasonably well for all treatments, with the control and chemical N + farm yard manure showing the best agreement (RMSE = 7). At the humid site, Century performed less well. This could have been due to a range of factors including site history. During the study, Century was calibrated to simulate crop yields for the two sites considered using data from across the Indian IGP. However, further adjustments may improve model performance at these sites and others in the IGP. The availability of more longterm experimental data sets (especially those involving flooded lowland rice and triple cropping systems from the IGP) for testing and validation is critical to the application of the model's predictive capabilities for this area of the Indian sub-continent. (C) 2007 Elsevier B.V. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Archaeology, Geography and Environmental Science
Interdisciplinary centres and themes > Soil Research Centre
ID Code:3267
Uncontrolled Keywords:soil organic carbon century crop yield India SOIL ORGANIC-MATTER NITROGEN FOREST
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