A STUDY ON SUSTAINABLE USE OF SOIL RESOURCES RELATED TO THE DEVELOPMENT OF ANDISOLS AND VEGETATION CONTROL

本文从土壤形成和地理分布两个角度，对日本分布的红土土进行调查，研究红土土的发展与古代土地利用制度的关系。本研究的目的是评价植被控制对土壤保持的影响，探讨安迪索土壤资源可持续利用的意义。安地索的地理分布与与古代生物密切相关的草原发育相对应，以古！中世纪的放牧记录和出土的马骨制品。从对陷阱的初步研究推断，可持续的草地控制对有效狩猎的必要性影响了安迪索尔的发展。关东地区高地浅色安地石的形成与古代制铁降雨有很好的对应关系。此外，在埼玉县…More Moroyaina高地发育的浅色andiols具有腐殖化程度低、北方植物岩颗粒较多的特点。这些发现支持了植被控制对次生林燃料需求中andiol形成的影响。这些次生林沿西北冬季季风轴线分布，具有保护表层土壤免受风蚀的功能。比较了可持续芒草草地和次生林条件下形成的土壤酚的特征；岩手县的玉屋、神奈川县的博代、岛根县的三部、熊本县的麻生。腐殖质组成、碱饱和度和交换性酸度Y1的分析表明，这些土壤的性质存在显著差异。以A型腐植酸形成量估算的固碳能力和碱饱和度解释的酸度控制能力，草地和土壤均有比森林和土壤增加的趋势。根据对粘土矿物的x射线衍射分析，推测其酸度控制能力取决于母质组成，母质组成以风沙供应为特征。我们认为，与优越的古代生物系统一起发育的安土醇是土地可持续利用和土壤保持的土壤资源。少

The relationship between the development of Andisols and the ancient land use system was studied by investigation on Andisols distributed in Japan accoiding to two points of view, soil formation and geographical distribution. The objective of this study is to evaluate the influence of vegetation control on soil conservation and discuss the significance of sustainable use of Andisols soil resources. The geographical distribution of Andisols show correspondence with the development of grassland closely related to ancient livings, represented by ancient! medieval age grazing records and excavated articles of horse bones. From preliminary studies on pitfalls, it is inferred that the nececssity of sustainable grassland control for effective hunting influenced the development of Andisol.The formation of Light colored Andisols in the upland of Kanto district shows good correspondence with the ancient rains of iron manufacture. Furthermore, the light colored Andisols developed in the upland of … More Moroyaina in Saitama prefecture, is characterized with low humification degree and relatively large amount of boreal phytolith grains. These fingings support the influence of vegetation control on Andisol formation in the needs of secondary forests as fuel. These secondary forest, which distribute along the axis of northwest winter monsoon, accompanies the function to conserve surface soil from wind erosion.The characteristics of Andisols formed under sustainable susuki (Miscanthus) grassland and secondary forest were compared in the following investigated areas ; Tamaya in Iwate prefecture, Bodai in Kanagawa prefecture, Sambe in Shimane prefecture, and Aso in Kumamoto prefecture. Remarkable difference was recognized in the properties of these soils supported by the analysis on humus composition, base saturation degree and exehangable acidity Y1. The capacity of carbon fixation estimated by the the formation of A type humic acid and the capacity of acidity control interpreted by base saturation degree both had tendency to increase in the grassland Andisols than that of forest Andisols. According to the X-ray diffraction analysis on clay minerals, we inferred that capacity of acidity control depends on composition of parent materials characterized by the eolian dust supply. We conclude that Andisols which developed with superior ancient living system are to be recognized as soil resource derived from sustainable land use and soil conservation. Less