Studies on Stem Cuttings for Woods Restoration by Coppice-Trees

The Effects of the Season, Soil Moisture and Shading

Abstract

From the viewpoint of restoring the native landscape, stem cuttings obtained from coppice seems to be suitable for revegetation of steep slopes which is formed when we develop newtowns or roads in hilly areas. In the previous article, we stated that Quercus lauca showed a considerable rooting by the treatment with β3-Indolebutyric Acid (IBA) 2000 ppm solution, even with 16-18 cm stem girth. The additional experimental research was conducted with sixteen species under different conditions, in 1985 and 1986.
The results were as follows: Most of species sprouted shoots by summer, except Castanopsis cuspidata, Ternstroemia gymnanthera, Rhododendron reticulatum and Eurya japonica. Whereas Quercus glauca showed enough rooting in early spring settings, in the case of autumn setting, almost all died. Since the other species also died in autumn settings, autumn setting was judged to be unsuitable way for stem cuttings.
In addition to Quercus glauca, such evergreen trees as Camellia japonica and Ilex crenata developed enough roots by the treatment with IBA 2000 ppm solution. However, deciduous trees such as Clethra barbinervis, Quercus serrata, Quercus variabilis, Lyonia ovalifolia and Prunus jamasakura mostly died by late summer even in the case of autumn cuttings. The results suggest that these deciduous trees lack abilities to develop enough roots by summer.
Incidentally, shading or daily watering caused serious damage due to spread of harmful bacilli or fungi, and no shade and weekly watering brought rather better results.