Can random components explain differences in the height–diameter relationship in mixed uneven-aged stands?

摘要: Tree height prediction is an important issue in forest management since tree heights are usually measured only a sample of trees. Although numerous model approaches have been used for this purpose, no agreement on which one more appropriate has achieved. To analyse the random effects basic and generalised height–diameter (h–d) models fitted to multi-species uneven-aged stands, establish their ability explain differences between ecoregions, plots species. Height diameter measurements 29,084 trees from 187 located state Durango (Mexico) were used. Basic h–d mixed-models framework. The variability species was considered definition. Model calibration different sampling designs sizes also analysed. Random components performed well explaining relationship species; however, significant variance found ecoregions. A calibrated produced similar results fixed-effects when sufficiently large number process. From practical point view, if carried out, should be species, so that at least variation among captured.