2018 年 28 巻 S 号 p. 181-184
Salinity problem caused by shallow underground water level widely occurs in some semi-arid area within the wheat belt of Western Australia. As a countermeasure to this type of salinity problem, agro-forestry was proposed and carried out. By planting salinity tolerant trees in the saline area, underground water is used by planted trees, and then underground water level will gradually go down and expansion of salinization area is prevented. This approach will not only improve the salinity problem by agro-forestry, but also fix carbon as tree biomass by planted trees reducing carbon dioxide in the atmosphere. Then, this approach is considered as an effective countermeasure to climate change due to carbon dioxide increment. Up to now we have reported that Eucalyptus camaldulensis grows very rapidly in arid lands in Western Australia, while that its growth is slow due to salt damage in the semi-arid areas in Western Australia. Therefore, in this study, in order to clarify the influence of various factors on the growth of E. camaldulensis, the effect of planting density, soil salt concentration and precipitation amount and pattern was examined. As a result, the growth of E. camaldulensis was found to be markedly suppressed by the salt in the soil.