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Development of a hydrothermal time seed germination model which uses the Weibull distribution to describe base water potential

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  • Watt, Michael S.
  • Xu, Vega
  • Bloomberg, Mark

Abstract

Seed germination has been modelled extensively using hydrothermal time (HTT) models, that predict time to germination as a function of the extent to which seedbed temperature, T, and water potential, Ψ, exceed the base temperature, Tb, and base water potential, Ψb, of each seed percentile, g. Within a seed population the variation in time to germination arises from variation in Ψb(g) modelled by a normal distribution. We tested the assumption of normality in the distribution of Ψb(g) by germinating seed of two unrelated species with non-dormant seed (Buddleja davidii (Franch.) and Pinus radiata D. Don) across a range of constant Ψ at sub-optimal T. When incorporated into a HTT model the Weibull distribution more accurately described both the right skewed distribution of Ψb(g) and germination time course over sub-optimal T than the HTT based on the normal distribution, for both species. Given the flexibility of the Weibull distribution this model not only provides a useful method for predicting germination but also a means of determining the distribution of Ψb(g).

Suggested Citation

  • Watt, Michael S. & Xu, Vega & Bloomberg, Mark, 2010. "Development of a hydrothermal time seed germination model which uses the Weibull distribution to describe base water potential," Ecological Modelling, Elsevier, vol. 221(9), pages 1267-1272.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:9:p:1267-1272
    DOI: 10.1016/j.ecolmodel.2010.01.017
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    Cited by:

    1. Mesgaran, Mohsen B. & Onofri, Andrea & Mashhadi, Hamid R. & Cousens, Roger D., 2017. "Water availability shifts the optimal temperatures for seed germination: A modelling approach," Ecological Modelling, Elsevier, vol. 351(C), pages 87-95.

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