Abstract
To explain patterns and variations in concentration of defence-related carbon-based secondary compounds in plant tissues, different complementary and in some parts contradictory plant-defence hypotheses were developed since several years. These conceptual hypotheses cannot be fully evaluated without a plant growth simulation model and consequently, the discussion about adequacy of plant- defence hypotheses neglects to a large extent the dynamics of plant growth. To get a more realistic view of the volatile dynamics of plant internal source and sink strengths of carbon and nitrogen during different phenological growth stages, a modelling approach for allocation of carbohy- drates to a pool of carbon-based secondary compounds was integrated into the functional generic plant growth model PLATHO. In this paper, we explain the fundamental as- sumptions of our modelling approach and present the re- sults of a simulation study for juvenile beech and spruce trees growing in mono- and mixed cultures under ambient and elevated atmospheric CO2.
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