Validation of the single tree stand growth simulator PROGNAUS with permanent plot data
1996
Sterba, H. (Universitaet fuer Bodenkultur, Vienna (Austria). Institut fuer Waldwachstumsforschung) | Monserud, R.A.
The objective is to examine the validation of the basal area increment model in the individual tree stand growth simulator, PROGNAUS. The simulator is designed to forecast the development of both pure even-aged and mixed-species uneven-aged stands in Austria using distance-independent individual tree methodology. The primary model is for basal area increment (BAI), which is predicted from size (diameter, crown ratio), competition (basal area of larger trees, crown competition factor), and site descriptors. Because the model must be able to simulate the development of both uneven- and even-aged stands, site index and age are intentionally not used as predictors. Available for testing is and independent data set of 22 permanent plots in mixed Scots pine (Pinus sylvestris L.) - Norway spruce (Picea abies L.) stands in the Austrian part of the Bohemian Massif, northeastern Austria. The validation plots were remeasured for three five-year periods between 1977 and 1992. Observed BAI increments and those projected by PROGNAUS exhibited squared coefficients of correlation of 0.31-0.36 for Scots pine and 0.63-0.69 for Norway spruce using the validation data
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