Differential ability of the root to change rhizosphere pH between Chamaecyparis obtusa Sieb. (Hinoki) and Quercus serrata thumb. (konara) under aluminium stress

摘要

Aluminium has a strong effect on many plant species, and there are reports of differing responses to Al between coniferous and broadleaf trees. A study was conducted on the effect of various concentrations of Al in nutrient solutions on tree root systems, using Chamaecyparis obtusa Sieb. (hinoki) and Quercus serrata Thumb. (konara) seedlings. Konara showed a tendency to enhance its root growth with increasing Al concentration in nutrient solution. The ability to change the rhizosphere pH decreased for both hinoki and konara with increasing Al concentration, but konara showed a higher pH change ability. It is suggested that konara and hinoki have different strategies to adjust the pH of acid soil.