A diameter growth index method for standardization of forest data inventoried at different dates
1993
Soederberg, U. | Ranneby, B. | Li, C. (Sveriges Lantbruksuniv., Umeaa (Sweden). Inst. foer Skogstaxering)
A model of tree diameter growth during the growth season was developed to standardize the forest data from different inventory dates. A diameter growth index is defined and its relation with the number of growing days is established. Parameters characterizing this relationship are estimated using accurate tree ring width measurements and other stand and tree related variables from the Swedish National Inventory data for 1989. The residual analyses show that the model is an effective expression of the actual growth and the results are consistent with an earlier used tree growth model. Some climatic data are tested for model improvement, but no essential improvement is gained given the data available.
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