Vegetation monitoring about the effects of typhoon on bio-diversity in "Satoyama" neighborhood evergreen broad-leaved forest

常绿阔叶林被认为是日本暖温带的顶层群落。近年来，顶端植被中植物个体发生和物种更替部分重复的动态观点得到支持。水仙阔叶林受到台风的干扰，1991年形成了新的林隙，对那里的种群动态进行了30多年的监测。在本研究中，调查了与一些林隙相关的连根拔起对森林更新的影响。对于每个坑-丘，测量了点的位置和丘的大小。检查并记录被连根拔起的树木的长期调查ID号和种名。每个坑丘微型遗址被划分为四个地形部分。测定了各树种的盖度和每0.3×0.3m样方的最大株高。小区1、小区2和小区3的森林现存量分别为220、320、330吨ha~(-1)。与台风前相比，分别下降到55%、70%和85%。这43个物种是在36个微型站点上记录的。坑坡在植物总盖度、物种丰富度和植物高度方面最高。相比之下，坑底是四个城市中最低的一个。所有微型样点均出现4个物种，但其盖度均低于完整地面的盖度。地面小乔木(胸径4.5 cm)的树干直径RGR由台风前的0.02年恢复到0.04年。根起丘附近未受干扰个体的RGR恢复到0.2年。当树冠间隙形成时，伴随着连根拔起的土堆，附近的一些幼树可以快速生长。因此，台风对森林的干扰可以加速演替，保护生物多样性。

Evergreen broad-leaved forests are thought to be climax communities in the warm-temperate zone of Japan. Recently, dynamic views are supported that plant individuals take place and species substitutions are repeated partially in the climax vegetation. Minamata broad-leaved forest was disturbed by the typhoons and new gaps were created in 1991 where population dynamics had been monitored for more than 30 years. In this study, the effect of uprooting which associated with some gaps on regeneration the forest was surveyed. For each pit-mound, the location of the points and mound size was measured. The long-term survey ID number and species name of the uprooted trees were checked and recorded. Each pit-mound micro site was classified into four topographical parts. The percent cover of each plant species and the maximum height of plants in each 0.3×0.3m quadrate was measured. The standing biomass of the forests estimated as 220, 320, 330 ton ha^<-1> in Plot1, Plot2 and Plot3, respectively. It decreased to 55%, 70% and 85% as compared with before typhoon. The 43 species were recorded on 36 micro sites. Pits-slope was the highest in total plant cover, species richness and the height of plants. In contrast, pits-bottom was the lowest of four. Four species emerged on all micro sites but their covers were lower than those on the intact floor. Trunk diameter RGR of small tree (DBH <4.5cm) at the floor recovered to 0.04 year^<-1> as compared 0.02 year^<-1> of before typhoon. The RGR of the undisturbed individuals near root-up mound recovered to 0.2 year^<-1>. When crown gaps are formed accompanied with uproot mounds, some young trees near there can grow rapidly. Consequently forest disturbance by typhoon could accelerate succession and preserve bio-diversity.