静岡県牧ノ原における茶園-水田連鎖系による窒素流出負荷低減効果の推定

• 戸田 任重

  静岡県農業試験場海岸砂地分場:(現)信州大学理学部

• 望月 康秀

  静岡県農業試験場海岸砂地分場

• 川西 琢也

  金沢大学工学部

• 川島 博之

  農業環境技術研究所

書誌事項

タイトル別名

• Estimation of Reduction in Nitrogen Load by Tea and Paddy Field Land System in Makinohara Area of Shizuoka
• シズオカケン マキノハラ ニ オケル チャエン スイデン レンサケイ ニヨル

抄録

In the Makinohara area of Shizuoka Prefecture, by measuring the flow rate and nitrate concentration of a stream throughout the year in 1995, we estimated the nitrogen leaching rate from a tea field in its catchment basin. The nitrate concentration of the stream showed little seasonal variation at each branch, with annual averages of 29.6, 19.0 and 32.5 mgN L^<-1>, respectively. The total annual nitrogen outflow from the stream was 3.34x10^4 kgN y^<-1>. Based on the annual flow rate of the stream, the annual rainfall and the evapo-transpiration data reported for the tea field, we estimated the drainage area of the stream as 137 ha, (mainly composed of a tea field and forest area of 19.4 ha) and estimated the leaching rate from the tea field as 284 kgN ha^<-1> y^<-1>. In the paddy field receiving irrigation water from the small stream above, the nitrogen inflow integrated over the irrigation period of 99 d was 314 kgN ha^<-1> and the nitrogen outflow was 80 kgN ha^<-1> The amount of nitrogen removed in the paddy field reached 234 kgN ha^<-1>. The nitrogen budget and stable nitrogen isotope ratios of nitrate in the inflow and outflow indicate that denitrification was the main contribution to nitrogen removal in the paddy field. Using the leaching rate from the tea field and nitrogen removal rate of the paddy field as obtained above, and agricultural statistical data for the tea and paddy fields in the Makinohara area, we estimated the total amount of nitrogen leached out from the tea field as 1.86x10^6 kgN y^<-1>, and that 3.24x10^5 kgN y^<-1> was removed in the paddy field. In the Makinohara area, the reduction of nitrogen load by the tea and paddy field land system was estimated to be 17.4 % under present conditions.

収録刊行物

• 日本土壌肥料学雑誌

  日本土壌肥料学雑誌 68 (4), 369-375, 1997

  一般社団法人 日本土壌肥料学会

キーワード

• 硝酸態窒素
• 窒素溶脱
• 茶園
• 水田
• 牧ノ原

詳細情報

• CRID: 1390282681532892800
• NII論文ID: 110001747361
• NII書誌ID: AN00262117
• DOI: 10.20710/dojo.68.4_369
• ISSN: 24240583
• ISSN: 00290610
• NDL書誌ID: 4268297
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030561007
• Web Site: http://hdl.handle.net/2297/32502
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4268297
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • IRDB
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可