Nutrient Transfer with Rainfall in the Canopies of a Broad-leaved Deciduous Forest in Okuchichibu

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  • Imamura Naohiro
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Tanaka Nobuaki
    Ecohydrology Research Institute, The Tokyo University Forests, The University of Tokyo
  • Ohte Nobuhito
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Yamamoto Hirokazu
    Graduate School of Frontier Sciences, The University of Tokyo

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  • 奥秩父の落葉広葉樹林における樹冠部での降水の移動に伴う溶存物質動態
  • オクチチブ ノ オチバ コウヨウジュリン ニ オケル ジュカンブ デ ノ コウスイ ノ イドウ ニ トモナウ ヨウゾンブッシツ ドウタイ

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Abstract

This study examined nutrient transfer with rainfall in the canopies for Fagus crenata, F. japonica, and Tsuga sieboldii of a broad-leaved deciduous forest in Okuchichibu, Japan. For all three species, we collected year-long data on monthly wet deposition, throughfall, and stemflow deposition of the inorganic ions Na+, Cl−, SO42−, K+, Mg2+, Ca2+, H+, NH4+, and NO3−. Using this data set, we derived the monthly net throughfall deposition of these ions for analysis. Seasonal patterns of net throughfall deposition of Na+, Cl−, and SO42−, for which canopy leaching and uptake are normally negligible, differed significantly between species, suggesting that the seasonal patterns of dry deposition containing these substances varied greatly between species. The sum of throughfall and stemflow deposition of K+ was much larger for F. crenata and F. japonica than for T. sieboldii. A filtering approach suggested that the large K+ deposition for F. crenata and F. japonica could be caused by canopy leaching of K+ during the growing season. The annual sum of throughfall and stemflow deposition of Mg2+, Ca2+, and NO3− for T. sieboldii, an evergreen conifer, was much larger than for the two deciduous, broad-leaved trees (F. crenata and F. japonica). The larger annual total deposition of Mg2+, Ca2+, and NO3− for T. sieboldii could result from increased dry deposition on the canopy during the dormant season.

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