Establishment of the Method for Greening and Its Management at seaside Reclaimed Land

目前濑户内海国家公园绿地面积和天然海滨林区面积急剧减少的现象十分明显，应考虑尽快进行根本性调查并采取相应措施。在本研究中，进行了以下调查。(1)测定了滨海天然林区垦殖土壤和表层土壤的物理性质。(2)阐明施用有机和无机土壤调理剂建立表层土壤稳定性与施用后各种乔木植物生长的关系。从盐对生长抑制的角度出发，对第一个可见抑制的叶片进行了研究。(3)在施用无机（含吸水性化学药剂）和有机土壤改良剂后，对各种树木的种子进行播种，并测量每种树木的发芽和生长情况，以寻找绿化滨地的最佳树种。(4)特别是今年，从林区自然更新的角度，分析了天然树种子自然出现或消失的实际情况。(5)建立了消除树木盐害的技术。降雨的反复淹排对降低含盐量是有效的，特别是在丘陵地区。

Now, a rapid decrease in green area of the National Park of Seto Inland Sea as well as natural seaside forest area is obvious, therefore it should be considered to taking the fundamental investigation and the measures against it as soon as possible. In this study, the following investigations are carried on.(1) The physical property of reclamation soil and surface soil in natural seaside forest area is measured.(2) the relationship between the application of organic and inorganic soil conditioner to establish the stability of surface soil and the growth of various tree plants after the application is clarified. With the view point of the inhibition of growth by salt, the leaf of first visible inhibition is investigated successively.(3) To find the best kind of trees for greening the foreshore land, the seeds of various trees are seeded after the application of inorganic (including thewater absorbing chemicals) and organic soil conditioner, and the germination and the growth of each kind of trees are measured.(4) Especially in this year, actual status of natural appearance or dsappearance of seedlings from natural tree seed is analyzed from the view point of natural renewal in forest area.(5) The techniques to eliminate the salt damage of trees are established. The repeated flooding and drainage of rainfall is effective to decrease in salt contents, especially in case of hedro area.