緑化樹木の樹幹流に及ぼす酸性雨の影響

概要

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The probability is that the effects of acid rain will be more dramatic in revegetated areas than in forest soil areas due to the greater level of deterioration in the physical and chemical properties of the soil in revegetated areas. For this reason, we measured the pH value of forest-tree stem flow and gathered test samples of revegetated plant characteristics. The results show that for conifers, the pH value is highest in the rainfall outside the tree crown, and generally declined inside the tree crown and in the stem flow. In contrast, for broad-leaved trees, the pH value increases in the following order : outside the tree crown, inside the tree crown and in the stem flow.We are able to predict a small variation in the pH value in the stem flow of all tree species peculiar to this tree type. The internal factors are stand structure, tree from, leaf from, bark structure, and degree of difficulty during eluviation at a particular leaf growth stage. The rainfall is considered as a contributing external factor. The above findings indicate the necessity of determining which revegetated species and methods of planting are to be used for a particular tree characteristic. We must also reduce the load on revegetated areas, given that the majority of rainfall infiltrates via the soil in the form of rainfall inside the tree crown and stem flow.
日本雨水資源化システム学会の論文