Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 62. (Budapest 1970)

Kováts, D.: Quantitative xylotomic investigations on the xylem of our home ash trees

Fig. 3. The heterogeneity of changes in the growth ring width. S = accessory graph illustrating increase and decrease in growth ring width; + = prevailing increase in growth ring width in the examined trees; — = prevailing decrease in growth ring width in the examined trees; 0 = the greatest rate of heterogeneity: the number of increases and decreases of the growth ring widths equalize each other On the basis of data calculated by the above formula, I pi otted the ratio of growth ring width increases and decreases on the accessory graph of Fig. 3. In the examined trees the growth ring width increases and decreases ha d nearly equalized one another, as illustrated by the ratio submitted below: (7 + 6) + (7 + 5) (7 + 6) + (7 + 4) 25 24