Dry mass production and leaf area development of field-grown ornamental conifers: measurements and simulation
2003
Pronk, A.A. | Heuvelink, E. | Challa, H.
A dynamic simulation model of dry mass (DM) production and leaf area index (LAI) development in ornamental conifers, CONGRO, was developed. The concept of a constant radiation use efficiency (RUE) was combined with a model for radiation interception by row crops. A field trial was used to calibrate RUE, DM partitioning and the specific leaf area (SLA). LAI increase was simulated through leaf dry mass increase and SLA. Ten independent trials (1991-1999) were used for validation. Predicted aboveground DM agreed well with measured data (R2=0.94) with a standard error of the regression of 149 g m-2. Predicted LAI agreed less with experimental field data (R2=0.90), standard error of the regression was 0.312 m2 m-2. Sensitivity analysis showed a large positive sometimes more than proportional effect of RUE, SLA and partitioning into the leaf dry mass on simulated total DM, LDM, LAI and intercepted radiation.
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