ミズキ樹液の無機成分組成の季節変化および夏季の日変化

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The seasonal variation of the nocturnal concentrations of the major inorganic ions in the branch xylem sap of 11-year-old Cornus controversa HENSL. was studied by vacuum extraction using an attached branch. The diurnal change of inorganic ion concentrations was studied by vacuum extraction using a detached branch in connection with the heat pulse velocity of the stem and the xylem pressure potential of the leaves on a clear summer day. There were increases in the concentrations of most ions just prior to leaf emergence followed by rapid decreases as the leaves expanded. The concentration peaks of the cations were K^+ : 175 and Ca^<2+> : 265 ppm, while those of the anions were Cl^- : 51,NO_2^--N : 4,NO_3^--N : 6,and SO_4^<2->-S : 25 ppm both before leaf emergence at the beginning of March, but the Mg^<2+> peak was 25 ppm in late May. The coefficient of correlation, using a simple equation between the K^+ and Ca^<2+> or Cl^- nocturnal concentrations, was above 0.80,and that between the Ca^<2+> and Cl^- or NO_3^--N concentrations was above 0.7. The coefficients of correlation between total cations (K^++Ca^<2+>+Mg^<2+>) or total anions (Cl^-+NO_2^--N+NO_3^--N+SO_4^<2->-S) were 0.91,and those between total cations or total anions and K^+, Ca<2+>, and Cl^- concentrations were above 0.7. On a clear summer day, the inorganic ion concentrations of branch xylem sap were maximum at noon and minimum at night. The time and duration of sampling need to be considered when sampling branch xylem sap in investigating nutrient concentrations.
日本森林学会の論文
1991-11-01

ミズキ樹液の無機成分組成の季節変化および夏季の日変化

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