Green-tuff landslide areas are beneficial for rice nutrition in Japan

Anais da Academia Brasileira de Ciências

Kazue Tazaki¹ 

[1] ,Kanazawa University Kakuma Faculty of Science Department of Earth SciencesKanazawa Ishikawa ,Japan

关键词: green-tuff;    terraced rice field;    landslide;    microbial materials;    tufo verde;    terraços de campos de arroz;    deslizamento;    materiais microbianos;   

DOI  :  10.1590/S0001-37652006000400010

来源: SciELO

【 摘 要 】

Japanese Islands are covered with weathered volcanic rocks and soils. Terraced rice field are located in green-tuff areas which are very fertile but where landslides occur associated to strong earthquakes. The Xray diffraction and X-ray fluorescence analyses of the soils in landslide area identified predominant smectite and Mg, Al, Si, K, Ti, Mn and Fe are main components. The rice leaf showed that S, Cl, K and Ca play important roles for nutrients in the area. Drainpipe systems have set up in the green- tuff areas to reduce the risks of landslides. Reddish brown microbial mats inhabited bacteria and diatom in the drainpipe outlets. The microbial mats are rich in Fe and PO4(3-). The iron bacteria in the ground water have a high metabolic rate suggesting that the weathering materials were produced by not only physical and chemical influence but also by microorganism. Many microorganisms attach to mineral surfaces and show their high impact in the water mineral chemistry in the landslide area. Bacteria in the green-tuff over landslide area play important roles for sustainable agriculture including rice nutrition.

【 授权许可】

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