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Hydrochemical characteristics of throughfall and stemflow in a Moso-bamboo (Phyllostachys pubescens) forest

Authors

  • Masaaki Chiwa,

    Corresponding author
    1. Department of Forest and Forest Products Sciences, Faculty of Agriculture, Graduate Schools of Kyushu University, 394 Tsubakuro, Sasaguri 811-2415, Japan
    • Graduate Schools of Kyushu University, 394 Tsubakuro, Sasaguri 811-2415, Japan.
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  • Yuka Onozawa,

    1. Department of Forest and Forest Products Sciences, Graduate School of Bioresources and Bioenvironmental Sciences, Kyushu University, 394 Tsubakuro, Sasaguri 811-2415, Japan
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  • Kyoichi Otsuki

    1. Department of Forest and Forest Products Sciences, Faculty of Agriculture, Graduate Schools of Kyushu University, 394 Tsubakuro, Sasaguri 811-2415, Japan
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Abstract

To investigate the impacts of the invasion by bamboo on fluxes of nutrients and pollutants, the nutrient/pollutant fluxes and canopy interactions, including neutralization of acidity, leaching and uptake of nitrogen (N), were characterized in conjunction with rainfall partitioning in a Moso-bamboo (Phyllostachys pubescens) forest. Measurements of precipitation volume, pH, major ions, and silicate (SiO2) in rainfall, throughfall and stemflow were collected weekly in a Moso-bamboo forest located in Munakata City, Western Japan for 1 year. Results showed that rainfall partitioning into stemflow was larger than that for other types of forest, which may be due to the properties of Moso-bamboo forest structure, such as a straight and smooth culm. Inorganic N (NO3 + NH4+) and S (SO42−) fluxes of throughfall and stemflow were approximately 1·6 and 1·3 times higher than that of rainfall, respectively. Contribution of stemflow flux to inorganic N and S fluxes to the forest floor was high. This could be due to lower uptake of inorganic N through culm and a higher rainfall partitioning into stemflow than that for other types of forest. The Moso-bamboo canopy neutralized rainfall acidity, reducing the fluxes of potentially acidifying compounds via throughfall and stemflow. Canopy leaching of K+ was distinctly higher than that of Mg2+ and Ca2+ and could be related to the high mobility of K+ in plant tissues. Cl and SiO2 were readily leached as for K+. The impact of the invasion by bamboo on nutrient cycling was discussed. Copyright © 2010 John Wiley & Sons, Ltd.

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