Crown property and growth condition of 7乃如脚 曽 dolahrnte var . hondej ' as understory trees naturally regenerated in a Cr7ptomeria/iaponicE planted forest in Shizukuishi Machi of Iwate Prefecture . Tohoku J . For . Sci. 16 ( 2 ) : 33 ・ 38, 2011 ・ The growth condition of T . dolfibrntn var . hondni as understory trees which had been naturally regenerated in a C / ' aponica planted fl )rest was compared with that Qf ( :ノ hρonica as understory trees in relation to crown structure and function .

more »

... ough relative light intensities received by the understory trees were almost the same between the two species at more than lO% , height and diameter growths of T. doiabrnta as understory trees were smaller , be[ ng bebw lO cm in annual height growth , than those of O ノ βρα 71 と a 7:dolabrfita understory trees had めnger crown lengths , on their lower height of crown base , and had more crown leaf masses , with higher leaf mass densities in spite of their lQwer branch densities , On the other hand , T. dolibrata understory trees shQwed lower Leaf nitrogen contents in either Qf surface , medium , and inner parts Qf the crowns : the inter −speci 五c difference was pronounced in the surface part. The 且 ow growth performance of Z doffibrata understory trees was therefQre due to the content level and the allocation pattern of nitrogen among the crown leaves , In practicing multi − storied forest managements by introducing T . dolabrata as understory trees , it would be necessary to take notice Gf the fact that the inactive growth was observed under the re [ atively high Iight conditions .