Modelling the role of algae in rice crop nutrition and soil organic carbon maintenance

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Gaydon, D.S.; Probert, M.E.; Buresh, R.J.; Meinke, H.; Timsina, J., 2014, "Modelling the role of algae in rice crop nutrition and soil organic carbon maintenance", https://doi.org/10.7910/DVN/23785, Harvard Dataverse, V1
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Description
Photosynthetic aquatic biomass (PAB - algae and other floodwater flora) is a significant source of organic carbon (C) in rice-based cropping systems. A portion of PAB is capable of fixing nitrogen (N), and is hence also a source of N for crop nutrition. To account for this phenomenon in long term simulation studies of rice-based cropping systems, the APSIM modelling framework was modified to include new descriptions of biological and chemical processes responsible for loss and gain of C and N in rice floodwater. We used well-tested algorithms from CERES-Rice, together with new conceptualizations for algal dynamics, in modelling the contribution of PAB to maintenance of soil organic C and soil N-supplying capacity in ricebased cropping systems. We demonstrate how our new conceptualization of PAB growth, turnover, and soil incorporation in flooded rice systems facilitates successful simulation of long-term soil fertility trials, such as the IRRI Long Term Continuous Cropping Experiment (35+ years), from the perspectives of both soil organic carbon levels and yield maintenance. Previous models have been unable to account for the observed maintenance of soil organic C in these systems, primarily due to ignoring inputs from PAB as a source of C. The performance of long-term rice cropping system simulations, with and without inclusion of t hese inputs, is shown to be radically different. Details of our modifications to APSIM are presented, together with evidence that the model is now a useful tool to investigate sustainability issues associated with management change in rice-based cropping systems.
Keyword APSIM, ORYZA2000, Rice, Cropping systems, Biological nitrogen fixation, Algae
Notes Subject: null Type: CESD Notes: ;
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2012_Gaydon,DS_Modelling the role of algae in rice crop nutrition and soil organic carbon maintenance.pdf
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Published Jan 7, 2014
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