Abstract
Time series of annual crop production levels, at scales ranging from experimental trials to regional production totals, are widely available and represent a useful opportunity to understand crop responses to weather variations. This chapter discusses the main techniques of building models from time series and the tradeoffs involved in the many decisions required in the process. A worked example using United States maize production is used to illustrate key concepts.
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However, note that if the yield anomalies in Fig. 5.1b showed no sign of heteroskedasticity, then introducing the log transformation could lead to heteroskedasticity by suppressing values at the beginning of the record.
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The recent IPCC Fourth Assessment Report states: “Projected changes in the frequency and severity of extreme climate events will have more serious consequences for food and forestry production, and food insecurity, than will changes in projected means of temperature and precipitation (high confidence).”
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Extremely low and high values are nearly always bad for crops, so that the optimum value is found somewhere between.
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Lobell, D. (2010). Crop Responses to Climate: Time-Series Models. In: Lobell, D., Burke, M. (eds) Climate Change and Food Security. Advances in Global Change Research, vol 37. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2953-9_5
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DOI: https://doi.org/10.1007/978-90-481-2953-9_5
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