Economic evaluation of soft hardwood trees growing models | Mīksto lapu koku audzēšanas modeļu ekonomiskais vērtējums
2009
Grinfelds, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Dubrovskis, D., Latvia Univ. of Agriculture, Jelgava (Latvia) | Dagis, S., Latvia Univ. of Agriculture, Jelgava (Latvia) | Nikolajevs, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
The aim of the research was to study the models of regeneration, tending and harvesting of the following soft hardwood trees: birch, common alder, aspen and grey alder from the commercial point of view. In order to do that, the following objectives were set: 1) to calculate the profitability of the soft hardwood trees growth during the whole growth period of the stand, determining the commercial final cutting age; 2) to find out which soft hardwood tree species are best to grow from the commercial point of view; 3) how the forest profitability changes depending on the site index of the stand; 4) how the forest profitability changes in naturally and artificially regenerated stands. The paper also presents the explanation which soft hardwood tree species are the best to grow from the commercial point of view. According to the research programme, it was also researched how the forest profitability changes in naturally and artificially regenerated forest stands. With the degrading of stand site index this difference increases. Thus, for instance, in birch the Ist site index stands this difference is only 5%, IInd site index - 7%, but IIIrd site index - 17%. In grey alder stands this difference is greater. It is as follows: Ist site index - 19 %, IInd site index 27%, but IIIrd site index 40%. The economic research on growing forest from the commercial point of view is only at its initial stage.
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