Effects of a severe typhoon on forest dynamics in a warm-temperate evergreen broad-leaved forest in southwestern Japan

The effects of a typhoon on forest dynamics and the response of major tree species were studied in a warm-temperate evergreen broad-leaved forest in southwestern Japan. The strongest typhoon on record (T9313) passed through this region in 1993. Return periods of typhoons over 30 ms⁻¹ in instantaneous wind velocity and T9313 were estimated to be 2.2 and 104.5 years, respectively. Approximately 10% of all stems suffered some damage from T9313 and annual stem mortality rose from 1.3 to 2.7%. The estimated period that the number of stems would fall below 10% of the initial was four years shorter with T9313-class typhoons than without them. Thus, the disturbance by T9313 was not catastrophic at the site although T9313 was an episodic typhoon. The short-term responses of major tree species to T9313 were classified into four types: 1) blunt-response type with little decrease and recruitment of stems in the DBH ≥ 5 cm class (Distylium racemosum), 2) retreat type with larger decrease than recruitment (e.g. Quercus acuta), 3) sharp-response type with a large decrease and much recruitment (e.g. Cinnamomum japonicum), and 4) advance type with less decrease than recruitment (Eurya japonica). Among the four regeneration types classified by previous studies (climax, light-demanding, subcanopy, and few-sapling), the climax and few-sapling types each showed a specific short-term response, the blunt-response and retreat types, respectively, that explains one aspect of the regeneration strategies of each type. On the other hand, the light-demanding or sub-canopy type showed multiple short-term responses, indicating that each regeneration type contains species with various regeneration strategies. In this paper, I analyzed data from the database that was compiled by the Aya Research Team.     

浏阳大围山高山湿地的保护与开发

湿地越来越受到人们的关注,各种研究文献层出不穷,但对高山湿地的研究却很少,以浏阳大围山国家森林公园为例,借鉴自然保护区规划的经验,对高山湿地的保护与开发进行有益的探索。     

中国林业及其高得率浆之发展

对林业与纸业之关系及高得率浆的发展作了讨论，同时对林业发展制浆造纸工业的问题进行了分析。     

黄连木种子小蜂的研究进展

黄连木种子小蜂是黄连木的最主要害虫。该文对各地有关黄连木种子小蜂发生与危害特点、生活史、生长发育与环境的关系以及测报与防治方面的研究进展情况进行了总结。     

绿竹研究

综合论述了国内外对绿竹的特性、分属地位、分布、繁育、丰产培育技术、笋加工、竹材利用等相关领域的研究动态和进展,并就我国今后绿竹研究提出几点建议。     

青钱柳研究进展

青钱柳是我国独有珍稀植物。对青钱柳的开发利用价值及国内外的研究现状进行概述,并就青钱柳开发利用及研究方向进行了探讨。     

赣南树木园科研管理数字化建设初探

介绍了赣南树木园科研情况,探讨数字化建设的对策和内容,提出了数字化建设的技术.     

泵行业存在的主要问题及急需解决的关键技术

分析了我国泵行业研究与生产部门存在的主要问题对策，探讨了泵行业急需解决的关键技术。     

基于图形化电喷发动机教学软件的开发研究

结合我校已成功开发的大众时超AJR“电喷发动机实验教学考核台架”,根据电喷发动机的工作原理线路图,利用FLASH、DELPHI等软件开发的基于图形化电喷发动机教学软件,特别能把电喷发动机的故障现象通过图形化演示的方式形象地表现出来,结合利用发动机教学台架的教学功能,达到理论-实践一体化的教学,保证了汽车检测与维修专业相关课程的教学效果。