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– This is a modeling paper looking at how adding various amounts of wood ash (100, 200, and 400 kg/ha) to Boreal Forest soils as well as manipulating variables such as soil moisture and temperature can affect nitrous oxide emissions from soils. – The paper involves using a modeling software called Stella 8.1.4 (information about the software can be found here to create a nitrogen cycle model to simulate how changing 1) amount of wood ash added to soils 2) soil moisture 3) soil temperature can impact soil nitrous oxide emissions – Equations with appropriate units must be entered into the model to produce model outputs i.e. graphs/tables (equations for different components of the model can be found from reviewing the literature) – If no appropriate equations for model components such as soil moisture for Boreal Forest can be found, it is ok to use equations from another ecosystem. However, you have to justify the reasoning behind using a given equation. – The paper structure should contain the following sections: 1) Introduction/ background info (description of nitrogen cycle in Boreal Forest and its importance especially why we would want to model nitrous oxide emissions as it relates to climate change / brief review of literature on modelling nitrogen cycle in Boreal Forest 2) State and describe the model objective statement (essentially it is a statement indicating the purpose of the model/what the model sets out to accomplish) Ex: The model seeks to answer the effects of wood ash treatment, soil temperature, and moisture on nitrous oxide emissions from Boreal Forest soils at daily timestep over 1 year period. 3) Model description: describe any model assumptions/state and explain in detail the various model components 4) Model evaluation: carrying out sensitivity and uncertainty analysis (Quantifying the uncertainty of model output and indicating how the uncertainty can be apportioned to different sources). Ex: increasing/decreasing soil temperature and see how it influences the amount of nitrous oxide produced by the model. 5) Results: describe and explain in detail the various model outputs with graphs and tables which have to be included in appendix. 6) Discussion: how our Boreal Forest soil nitrogen cycle model compares with other similar models from the literature/ state and describe similarities and differences between our model and other related models 7) Future modification and directions: state and briefly describe shortcomings or limitations of our model/explain how our model can be improved
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