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[C-2.2 Impact of "Acid Rain" on Plant-environment Systems]

[Contact Person]

Ken'ichi Satake
Head, Acid Rain Team
Global environment Division, National Institute for Environmental Studies,
Environment Agency
l6-2 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-51-6111(Ext.329), Fax +81-298-51-4732

[Total Budget for FY1990-1992]

81,001,000 Yen

[Abstract]

　Essential and non-essential elements in the outer bark(dead secondary phloem)-inner bark(living secondary phloem)-vascular cambium-outer xylem sequence of a coniferous tree, Cryptomeria japonica, 360yr old were studied in relation to nutritional status and pollution. High concentrations of Al and Pb on the outside of the bark decreased exponentially toward the inside of the bark, reaching a minimum at the boundary between the outer and inner bark.The concentrations of essential bioelements (Mg, K, P, Cu, Zn) increased in the inner bark, and attained maximum values in the cambium layer (e.g. Mg:2160μgg^-1, K:20300μgg^-1, P: 1800μgg^-1). High correlations were found among these elements in the sequence from inner bark to the cambium layer(Mg:P, r=0.984 p<0.01; P:K, r=0.972 p<0.01). The concentration of Ca was high in the inner bark(phloem) and cambium layer(1.6-2.2%). SEMXMA study revealed the distribution of many crystals of calcium oxalate in the inner bark.

[Key Words]

Cambium, Bark, Metal, Cryptomeria japonica, Acid rain