Japanese Journal of Forest Environment
Online ISSN : 2189-6275
Print ISSN : 0388-8673
ISSN-L : 0388-8673
Special Feature Article
Effects of ground properties on the growth of broad-leaved trees planted on the slope of tsunami evacuation hills and road embankments, Iwanuma city, Miyagi Prefecture
Tetsuya Sano
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2023 Volume 65 Issue 2 Pages 57-67

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Abstract

After the Great East Japan Earthquake, tree-planting areas on the artificial ground, such as tsunami evacuation hills and road embankments have expanded. Since the properties of the artificial ground would depend on several factors such as embankment materials and construction methods, these would cause the variation of growth of planted trees by sites. In this study, the relationship between the growth of planted broad-leaved trees and the several ground properties were investigated at tsunami evacuation hills and road embankments constructed in Iwanuma City, Miyagi Prefecture, to make clear the main tree growth differentiated factors. Growth of tree seedlings in five embankments differentiated in times of construction and planting were measured over several years and its ground properties such as hardness, texture, nutrient content, and pH, were compared. The growth differences among embankments were related to the properties of the embankment materials rather than ground hardness. The growth of evergreen tree species, such as Machilus thunbergii, Quercus myrsinifolia, Q. salicina, Q. glauca, Q. acuta, Camellia japonica, and Ilex integra, slowed down on the embankments with acidic or alkaline reformed soils that contain fewer clay particles, organic matter, and exchangeable Ca and Mg. It was also suggested that the ground hardness could explain partial growth differences within a site. Within an embankment with the same material, slow growth of planted trees tended to occur on extremely hard or soft grounds.

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© 2023 The Japanese Society of Forest Environment
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