Effect of deforestation on the transport of particulate organic matter inferred from the geochemical properties of reservoir sediments in the Noto Peninsula

• Ochiai Shinya

  Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University

• Nagao Seiya

  Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University

• Yonebayashi Koyo

  Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University

• Fukuyama Taijiro

  Faculty of Agriculture, Shinshu University

• Suzuki Tomoyo

  Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University

• Yamamoto Masayoshi

  Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University

• Kashiwaya Kenji

  Institute of Nature and Environmental Technology, Kanazawa University

• Nakamura Koji

  Institute of Nature and Environmental Technology, Kanazawa University

書誌事項

タイトル別名

• Effect of deforestation on the transport of particulate organic matter inferred from the geochemical properties of reservoir sediments in the Noto Peninsula, Japan

抄録

The effects of artificial deforestation in the 1970s and the subsequent recovery process on the transport of particulate organic matter were investigated using reservoir sediments obtained from the Noto Peninsula in Japan. In 1975, the sedimentation rate increased to about 2.7 times its previous value because of deforestation and plantation activities in the catchment. The sedimentation rate remained high until 1991, suggesting that the erosion rate of soil and organic matter increased during the 15 years after the deforestation. This intensive erosion was induced by exposure of bare soil, forest management activities to remove understory vegetation, and heavy rainfall. Conversely, the δ¹³C and δ¹⁵N of the sediment organic matter has continued to decrease from the mid-1980s to the present time, despite the fact that the sedimentation rate has recovered to pre-deforestation levels. The decrease of the δ¹³C and δ¹⁵N of the sediment organic matter reflects a decrease in the contribution of soil organic matter, although post-depositional diagenesis and variability of the isotopic composition of the aquatic organic matter also affect the δ¹³C and δ¹⁵N. The decrease in the soil organic matter contribution suggests gradual recovery of vegetation, accumulation of forest floor organic matter, and reduction of soil erodibility. These results indicate that the change in the transport of organic matter continued for at least 35 years after the deforestation and plantation.

収録刊行物

• ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ

  ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ 49 (5), 513-522, 2015

  一般社団法人日本地球化学会

キーワード

• deforestation
• reservoir sediment
• particulate organic matter
• δ¹³C
• δ¹⁵N

詳細情報

• CRID: 1390282679530342400
• NII論文ID: 130005101410
• NII書誌ID: AA00654975
• DOI: 10.2343/geochemj.2.0379
• ISSN: 18805973
• ISSN: 00167002
• NDL書誌ID: 026775472
• Web Site: http://id.ndl.go.jp/bib/026775472
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026775472
• Web Site: https://www.jstage.jst.go.jp/article/geochemj/49/5/49_2.0379/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可