Study on the Soil Envrionments at Ornamental Plantations (1) : Soil Conditions and Tree Growths of Evergreen Roadside Trees in Coastal Area

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  • 緑地の土壌環境に関する研究(1) : 沿海地における常緑街路樹の土壌と生育
  • リョクチ ノ ドジョウ カンキョウ ニ カンスル ケンキュウ 1 エンカイチ

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The roadside plantation consisting of Elaeocarpus syluestris var, ellipticus and Pasania edulis 1-15 year-old after planting, which located along National road 202 on Matsuura River in Karatsu, Saga, in northwestern part of Kyushu, have been investigated as for the plantation surroundings of soil and climate, because some of the roadside trees were damaged on growth and seemed to lose their vigorousness. Although they showed the symptoms of death of stem top and tips of branches, defoliation, colorless of green leaves, retardation of growth, decrease of foliage, the soil physical and chemical conditions of damaged trees were almost same as normal or healthy trees, concerning soil profile, three-phases distribution, water permeability, water retentivity, soil hardiness, gravel content, carbon content, nitrogen content, phosphate content, potassium content and acidity. From the results of topographical analysis the damages in trees seemed to occur in the area faced to the river or without windbreak against north wind. It was, therefore, thought that the microclimatic condition, mainly the prevailing severe and cold wind in winter which were brought through Matsuura River, might cause the water stress in trees and affected the tree growth. It could be said that the prevailing wind in winter gives chronic damage more than soil condition to ornamental plantation in coastal city and causes stress on growth.

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