Abstract
This research aimed to verify the influence which roots cutting exerted on the growth of the roadside trees, and to management of an excellent street landscape through the comparison with the tree form. 40 trees (cornus florida L.) were divided into roots cutting group and control group (each 20 trees), and trees height, amount of branch extension, diameter of trunks, number of leaves, and maximum photosynthetic rate (Pmax) were measured at existed 18 trees from June to September, 2008. As a result, the average of trees height on roots cutting was 0.41cm lower than control, the average of diameter of trunks on roots cutting was 0.03cm higher than control. The diameter of trunks has grown instead of the tree height's decreasing. By the coloring water absorption experiment, the root on the cut side supplied water to the same side branch, then the number of leafs in the branch on cutting side has decreased by water absorption trouble. But, Pmax was maintained from the rise of the amount of water which was able to be used at the individual leaf. It was suggested that natural tree form of roadside trees were able to be maintained by roots cutting.
