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

目前，濑户内海国家公园的绿色面积以及天然海滨森林面积急剧减少的趋势十分明显，应考虑尽快进行基础调查并采取对策。本研究主要进行了以下几个方面的研究。(1)对海滨林区复垦土壤和表层土壤的物理性质进行了测定。(2)阐明了施用有机和无机土壤改良剂以建立表层土壤稳定性与施用后各种树木生长之间的关系。从盐抑制生长的角度出发，先后对第一个可见抑制的叶片进行了研究。(3)为寻找最佳的滨水绿化树种，对不同树种的种子分别施入无机（包括吸水剂）和有机土壤改良剂后进行播种，测定每种树种的发芽和生长情况。(4)特别是今年，从林区自然更新的角度，分析了天然林木种子成苗的实际情况。(5)建立了消除树木盐害的技术措施。降雨的反复淹没和排水对降低土壤盐分含量是有效的，尤其是在六面体区域。

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.