The standard errors of estimate for the dominant height at a
given age and site index of 0.94 and 0.63 m in Gambo–
Shashemene and Munesa, respectively, are such as they may be
expected for individual height growth curves. Ngugi et al.
(2000) reported the RMSE of 0.58 m for C. lusitanica for
Schumacher’s polymorphic equation. Comparing Figs. 2 and 3,
the plots at Munesa fit very well into the shape of the final site
index system, while at Gambo–Shashemene there are a few
plots which seem to develop differently. As Teshome and Petty
(2000) pointed out, random shifts in site index may be expected
from year to year due to climatic fluctuation, measurement
errors, and damage of dominant heights by disease and rare
cases where dominant trees are removed by high thinning. The
probable reason for the present study may be random
measurement errors and damage of dominant trees due to
bark peeling.
The standard errors of estimate for the dominant height at agiven age and site index of 0.94 and 0.63 m in Gambo–Shashemene and Munesa, respectively, are such as they may beexpected for individual height growth curves. Ngugi et al.(2000) reported the RMSE of 0.58 m for C. lusitanica forSchumacher’s polymorphic equation. Comparing Figs. 2 and 3,the plots at Munesa fit very well into the shape of the final siteindex system, while at Gambo–Shashemene there are a fewplots which seem to develop differently. As Teshome and Petty(2000) pointed out, random shifts in site index may be expectedfrom year to year due to climatic fluctuation, measurementerrors, and damage of dominant heights by disease and rarecases where dominant trees are removed by high thinning. Theprobable reason for the present study may be randommeasurement errors and damage of dominant trees due tobark peeling.
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