Seasonal Changes in Litterfall, Nutrients in Litterfall and Nutrient Use Efficiency in a Japanese Cedar (Cryptomeria japonica) Stand

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  • スギのリターフォールおよび養分の季節変化と養分利用効率
  • Seasonal Changes in Litterfall Nutrient

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Litterfall was collected at monthly intervals over a one-year period in a Japanese cedar (Cryptomeria japonica D. Don) stand in an experimental field on the Nagoya University Campus. The nutrient amount in the litterfall was analyzed. Total litterfall was 934g m^-2 per year. Leaves, branches, fruits and flowers contributed 80.35, 7.48, 4.38 and 7.79%, respectively, to the total litterfall. Litterfall, which was the highest in September, was attributed to the effect of a typhoon. The total amount of nutrients in the litterfall was 29.04 gm^-2 per year. The relative amount of the nutrients was in the order Ca>N>K>P>Mg. Calcium, accounted for 60.50%, N 27.73%, K 10.74%, P2.38% and Mg 2.34% of the total. The nutrient amounts in the litterfall was significantly correlated with the litterfall mass. Nutrient concentrations of the litterfall showed seasonal variations. A high nutrient efficiently uses Mg which indicates that Mg is in a limited supply.

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