Water Relations of Yezo spruce and Todo fir in Declined Stands of Boreal Forest in Hokkaido, Japan

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Recently, symptoms of decline have been widely observed in Yezo spruce (Picea jezoensis) and Todo fir (Abies sachalinensis) in Hokkaido. In order to clarify the mechanism of decline, the water status of Yezo spruce and Todo fir trees in the Tokyo University Forest in Hokkaido were investigated. The decline is observed mainly in stands damaged by Typhoon XV of 1981 (D-stands), but is not observed in undamaged stands (C-stands). Sampled trees in both types of stands were selected, the severity of their decline estimated, diurnal water potentials measured and water relation parameters such as water potential at turgor-loss point (Ψ_<w(tlp)>) and osmotic potential at full saturation (Ψ_<s(sat)>) were estimated by pressure-volume analysis. The diurnal trends of leaf water potential and midday water potential (Ψ_<w(min)>) of the sample trees were clearly different between the D-stands and the C-stand. Water stress in trees was much more severe in the D-stands than in the C-stand. Ψ_<w(tlp)> and Ψ_<s(sat)> of the declining trees were lower in the D-stands than in the C-stand. However, Ψ_<w(tlp)> and Ψ_<s(sat)> were not significantly different between declining trees and healthy-looking trees in D-stands. It was concluded that stand-level water stress, induced by the destruction of the canopy by the typhoon, was associated with the decline symptoms. The measurement of water relation parameters proved to be useful for diagnosis and prediction of decline at a stand level in this area.
一般社団法人日本森林学会の論文
1997-03-16

Water Relations of Yezo spruce and Todo fir in Declined Stands of Boreal Forest in Hokkaido, Japan

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