Dynamics of Water-soluble Ions in Soil by Slope Position in an Artificially Forested Watershed with Aging Japanese Cedar and Cypress.

• Oyanagi N.

  High-technology Center, Environment Research Science Niigata

• Kuboi T.

  Ishigaki Ranger Office, Naha Nature Conservation Office, Ministry of the Environment

• Toda H.

  Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology

• Haibara K.

  Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology

Bibliographic Information

Other Title

• 高齢化したスギ・ヒノキ人工林小流域における斜面位置別土壌中の水溶性イオンの動態
• コウレイカシタ スギ ヒノキ ジンコウリン ショウリュウイキ ニ オケル シャメン イチベツ ドジョウチュウ ノ スイヨウセイ イオン ノ ドウタイ

Abstract

The purpose of this study was to clarify the dynamics of water-soluble ions in soil by slope position in an artificially forested watershed with aging Japanese cedar (Cryptomeria japonica) and cypress (Chamaecyparis obtusa). We investigated the rate of nitrogen mineralization (NH₄-N + NO₃-N) and that of water-soluble ion generation in soil using an in situ incubation method, as well as the nutrient uptake by the tree bodies. The rate of NO₃-N generation, water soluble NO₃^– concentration, and water soluble Ca²⁺ concentration for cedar stand at the lower and middle slope positions were higher than those for cypress at the upper slope position. Water-soluble NO₃^– increased at almost the same percentage together with NO₃-N generation, but water-soluble SO₄^2– decreased after incubation. The percentage of water-soluble Ca²⁺ among the production of water-soluble cations was about 80% at the lower and middle slope positions, and about 50% at the upper slope position. Further, at the upper slope position, the amount of nutrients supplied to forest trees, and the nutrient uptake by tree bodies was about the same. On the other hand, at the lower and middle slope positions, the amount of nutrients supplied was greater than the uptake amount. At locations along streams, as at the lower slope position, it has been pointed out that there is a possibility that water-soluble NO₃^– and associated cations will run off and greatly affect stream water quality when the amount of nutrient uptake decreases due to the aging of planted trees.

Journal

• Journal of the Japanese Forest Society

  Journal of the Japanese Forest Society 89 (3), 151-159, 2007

  THE JAPANESE FORESTRY SOCIETY

Keywords

• exchangeable base
• forested watershed
• nitrification
• slope position
• water-soluble ions

Details

• CRID: 1390001205228316928
• NII Article ID: 110006882870
• NII Book ID: AA12003078
• DOI: 10.4005/jjfs.89.151
• ISSN: 1882398X
• ISSN: 13498509
• NDL BIB ID: 8880019
• Web Site: http://id.ndl.go.jp/bib/8880019
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8880019
• Web Site: http://www.jstage.jst.go.jp/article/jjfs/89/3/89_3_151/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed