Plant Nutrients Naturally Supplied to Land from Seawater

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  • NAKANISHI Yasuhiro
    Fac. of International Agriculture and Food Studies, Tokyo University of Agriculture
  • MATSUTANI Tatsuma
    Graduate School of Agriculture, Tokyo University of Agriculture
  • OZAWA Kiyoshi
    Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences
  • NARIOKA Hajime
    Graduate School of Bioresources, Mie University
  • FURUIE Katsuhiko
    Environment Science Department, Incorporated Foundation Okinawa Prefecture Environment Science Center
  • OGASAWARA Kei
    Environment Science Department, Incorporated Foundation Okinawa Prefecture Environment Science Center

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Other Title
  • 海水由来栄養塩類の陸域への自然供給量－「塩益」の定量評価
  • カイスイ ユライ エイヨウ エンルイ ノ リクイキ エ ノ シゼン キョウキュウリョウ : 「 エンエキ 」 ノ テイリョウ ヒョウカ

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Abstract

On small islands like the Ryukyu Archipelago in Japan, salts derived from seawater frequently drift to land, and the amounts carried by typhoons or monsoons become larger and can cause serious damage to crops. However, such a transfer of sea salts means a natural supply of plant nutrients contained in seawater to agricultural land. This study evaluated the amount of salts transferred from seawater to land in the Ryukyu Archipelago. The measurements were carried out in the southern part of Okinawa Is（26 oN）, Miyako Is. and Ishigaki Is.（24 oN both）, and were compared to the Tsu area（34 oN）on the mainland of Japan. In each area, 5 spatially open points were selected to set up an aerosol gauge developed for this study. The amounts of Na＋ trapped in the gauge were in the range of 1.8～2.6, 13.9～30.7, 10.8～22.4 and 10.6～16.4 g m－2 y－1 in Tsu, Okinawa, Miyako, and Ishigaki, respectively. The concentration ratios of Cl－/Na＋ in each area were almost the same as that of seawater, 1.798. The amount of K＋ derived from seawater in the archipelago areas was 0.4～1.2 g m－2 y－1. Na＋ trapped in typhoon events had a high positive correlation with the maximum spontaneous wind speed at some study points on Miyako and Ishigaki islands. The amount of Na＋ trapped in typhoon events in the archipelago areas was 11～22 times higher than that in the Tsu area.

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