A Study on Floristic Composition, Chorology and Ecological Structure: A case Study from a Small-scale Forest Reserve, Talesh, Iran

M. Ravanbakhsh, T. Amini
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引用次数: 3

Abstract

This study, carried out on vegetation of the Gisoum forest reserve with 171 hectares area located 14 km to Resvanshar city, Guilan province, was to examine the structure and composition of the forest vegetation. A first topographic map of the area with the scale of 1:10000 was prepared and the study area was delimited. Transect- quadrate method of sampling was used to record the floristic and phytosociological data necessary for the analysis in about 44 quadrates of 400 m2. Some vegetation parameters viz. density and diameter at breast height (DBH) for trees (over story vegetation) as well as cover-abundance for under story vegetation were recorded, respectively. The life form spectrum of Raunkiaer, the dominant vegetation type of the area, is based on importance value and vegetation structure based on frequency classes, also their chorology caring a central importance in vegetation description were determined. The study of the floristic list showed that 76 species belonging to 66 genera and 45 families existed in the area.The largest families were Asteraceae and Rosaceae with 5 species. Investigation of the geographical distribution of plant species indicated that 44 % belonged to the Europe – Siberian zone. Plant life forms by Raunkiaer method showed that phanerophytes with 35.5 % and hemicryptophytes with 27.6 % were the most frequent life forms. Dominant vegetation type based on importance value index was Buxus hyrcanus-Parrotia persica. Also the evaluation of vegetation structure based on frequency class revealed that abundance-distribution was irregular in under story and regular in upper story vegetation.
植物区系组成、年代与生态结构研究——以伊朗Talesh小规模森林保护区为例
本研究以贵州省瑞斯万沙尔市14公里处的吉苏姆森林保护区171公顷的植被为研究对象,对森林植被的结构和组成进行了研究。制作了第一张1:10000比例尺的地形图,并划定了研究区域。样带样方法在400平方米的44个样方上记录了分析所需的植物区系和植物社会学资料。分别记录了树(层上植被)的密度和胸径(DBH)以及层下植被的覆盖度。研究区优势植被类型Raunkiaer的生命形态谱以频率级为基础,频率级为基础的植被结构以频率级为基础,确定了其在植被描述中具有中心重要性的时序。植物区系表研究表明,该地区共有45科66属76种植物。以菊科和蔷薇科最多,共5种。植物种类的地理分布调查表明,44%属于欧洲-西伯利亚带。Raunkiaer法测定的植物生活型以显生植物(35.5%)和半隐生植物(27.6%)最为常见。基于重要值指数的优势植被类型为水杨-桃香。基于频率等级的植被结构评价结果显示,植被丰度分布在下层呈不规则分布,上层呈规则分布。
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