Base Temperature - Tbase

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Definition

Base temperature is the lowest temperature where metabolic processes result in a net substance gain in aboveground biomass (Sitte et al. 1999).


Information

The base temperature, sometimes referred to minimum temperature, is an essential parameter for the determination of the beginning and the end of the growing season. It has therefore an influence on the modeling of phenology and consequently of annual biomass increase. We refer to the definition of Sitte et al. (1998) who define base temperature as the lowest temperature where metabolic processes result in a net substance gain in aboveground biomass. Some authors further differ between various parts of plants such as shoots or leaves (Porter et al. 1999). Regional aspects of base temperature or plant specific adaptations like tree provenance or crop cultivar breedings can not be discussed further as published data for base temperatures are very limited. Most of cited parameter values for base temperature rely on rough estimates presented in textbooks (Keller et al. 1997, Aufammer 1998).


References