Soil and stream water characteristics of three small basins in Hirono,Shiiba Reserch Forest, Kyushu, Japan : underground vegetation damaged by deer

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  • Higashi Naoko
    Division of Forest Ecosphere Science and Management, Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University
  • Chiwa Masaaki
    Division of Forest Ecosphere Science and Management, Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University
  • Kumagai Tomo'omi
    Division of Forest Ecosphere Science and Management, Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University
  • Otsuki Kyoichi
    Division of Forest Ecosphere Science and Management, Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University

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  • シカ害のある流域における土壌の性質と渓流水質
  • シカガイ ノ アル リュウイキ ニ オケル ドジョウ ノ セイシツ ト ケイリュウ スイシツ

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Abstract

We report the soil physico-chemical properties and water quality of stream in two watersheds, which were damaged by deer feeding in Shiiba Research Forest. Bulk densities, volumetric contents of total soil pores, saturated volumetric water contents and saturated hydraulic conductivities were determined as physical characteristics, and water-soluble pH and EC were measured as chemical indicators in soil samples taken from three positions in the slope. Compared in site C, the volumetric contents of total soil pores and EC in site B were higher. This suggests that plants in site B have a greater tendency to use soil water and nutrients. In site C, especially in under position of the slope, a large amount of sand gravels were observed. In comparison of water quality of stream in 3 sites including site A, which has not damaged by deer, there is no difference in three sites, which have different condition of forest floor by deer damage. In the future plan, site C is surrounded by protecting net to avoid deer damage, and we continue to monitor the process of vegetation restoration and its effects on soil characteristics, comparing the control watershed, site B.

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