Fundamental Studies on the Tree-Temperature and Sun-scalded Injuries of Garden Trees. 1.

The Changes of Tree-Temperature after Transplanting

Abstract

The experiments were carried out to determine some of rational methods that would prevent the trees from being sun-scalded injuries and allow them to grow well after transplanting.
For these experiments; Zelkova serrata and Cinnamomum Camphora were used.
After transplanting, we measured the tree-temperature which was equal to the cambial-temperature. Then, we tried to find out the lethal temperature that sun-scalded injuries occurred.
The results obtained were as follows.(next page)
In the case of Zelkova serrata (non-trunkcovering. transplanting), it showed maximum tree-temperature of 46.0°C, on the west side, at 13: 30 and was exposed for about 20 minutes.
In the case of Cinnamomum Camphora (trunkcovering, transplanting), it showed maximum treetemperature of 47.0°C, on the west side, at 16: 30 and was exposed for about 25 minutes.
These maximum tree-temperature are lower than OKAMOTO's and HARTIG's (from 52°C to 57°C).
Up to the present, these trees did not incur sunscalded injuries.
The results show that a living 10-year old tree (Zelkova serrata, diameter 7cm) will grow well without a trunkcovering after transplanting.