DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2012 str. 46     <-- 46 -->        PDF

 
 
When A = 50, the calculated H value is
         H = 23.26 [1–exp(–0.041 ´ 50)]1.03 = 22.39m     (6)
The curve from Eq. 6 is the site index curve for a site index value of 22.39 m and index age of 50 years. Curves for other site index values were obtained from the guide curve equation by holding the shape parameters k and c constant and varying the asymptote parameter a as necessary to achieve the required H value when A (the index age) equals 50. The equation of the curve for site index SI was therefore
                   SI = ai [1–exp(–0.041 ´ 50)]1.03              (7)
so that
                  ai = SI [1–exp(–0.041 ´ 50)]–1.03              (8)
and
                             (9)
or, for prediction of site index from dominant height and age
                           (10)
 
For given age and dominant height, site index can also be derived from the graphical representation of the site index curves fitted for the Richards guide curve at index age of 50 years (Figure 3)