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From this height to the top of the stem it decreases. The rate of the area of the<br />
heartwood in the area of cross-section is shown with the curve on fig. 8. The correlation<br />
is positiv and reaches<br />
r = 0.721 ± 0.032<br />
9) The area of the sapwood quite constantly decreases from the stamp to the<br />
top of the stem. At lowest parts of stem this decreasing is high, but from the height<br />
of about 6 till 13 meters above the ground it is quite constant, and a'fter 13 meters<br />
above the ground it slowy decreases.<br />
10) From the above under points 1—9 given results, because of the regularity,<br />
as of the alternations of the heartwood and of the sapwood in the stem so, of the<br />
rate of the heartwood and of the sapwood inte the stem, it is possible in general to<br />
conclude, that the apperance of the reddish-brown heartwood is the natural caracteristic<br />
of the tree of the Blach Alder from Jjhe district of Drava river in the Republic<br />
of Croatia in Yugoslavia.<br />
11) It seems that the area of the sapwood on a certain cross-section of the stem<br />
is in correlation with the size of the crown of the tree (See table No. 5). For the<br />
definitive conclusion about this correlation, it will be necessary to make special<br />
investigations.<br />
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