Forest Damage by the 13th Typhoon in 1993 and Forest Management-In case of Oosumi Peninsula of Kagoshima Prefecture-

1993年的第13版于1993年9月3日登陆鹿儿岛县。那年夏天早些时候的台风和暴雨影响了该地区的森林和林业。为明确台风灾害的内容和台风对森林经营的影响，对乌苏米半岛地区进行了地面调查和问卷调查。结果表明：(1)柳杉受害林总数约为钝顶柳杉的7倍。计算了台风危害前各树种、各龄级的平均直径、平均树高、平均枝条数。与鹿儿岛地区的收获表相比较，说明了两种树种受损林分的良好生长状况。(3)通过对树径比和相对树干距离因子的分析，阐明了两种树种受损林分的林分过密状况。(4)约60%的林主没有为其森林投保。(5)31.4%的林主遭受森林损害。没有参保的原因是林主对参保内容不了解。(7)未参保的林主对1993年台风过后的森林保险合同持积极态度的比例为29.1%。(8)参保范围的延长不够。(9)现行的参保项目是通过对人工林或间伐的补贴来推进的。(10)大部分参保手续是由当地的森林业主协会办理的。

The 13th typoon of 1993 landed at the Kagoshima pref.on September 3 of 1993. This typhoon and the heavy rain ealier that summer influenced forests and forestry in the area. To clarify the contents of typhoon damage and the influence of the typhoon for the forest management, the ground survey and the questionnaire survey were done in the area of Oosumi Peninsula. As the results, followings are crarified.(1) The total number of damaged-forest of Cryptomeria japonica is about 7 times of that of Chamaecyparis obtusa. But Chamaecyparis obtusa is damaged heavier than Cryptomeria japonica.(2) The average diameter, average tree-height and number of stems before the typhoon damage are clculated on each species and each age class. Comparing with the yield table of Kagoshima area, the good growth of the damaged-stands is clarified in case of both species.(3) By analysis of the ratio of tree-height to diameter and the relative stem distance factor, the too dense forest condition of the damaged stands are clarified in case of both species.(4) Approximately 60% of forest owners did not have their forest insured.(5) 31.4% of forest owners incurred forest damage, but did not receive any payment of an insurance claim.(6) The reason for not having the forest insurance is that forest owners are not well acquainted with the contents of forest insurance program.(7) 29.1% of forest owners with no insurance had become more positive for contract of forest insurance after the typhoon in 1993.(8) The extension on forest insurance program is not enough.(9) The current forest insurance program has been promoted with the subsidy for the plantation or thinning.(10) Most of procedure of forest insurance is handled by the local forest owners association.