湖北省宜都野生楠木资源调查

【目的】了解湖北省宜都市的野生楠木资源分布状况、种群结构及其群落特征。【方法】采用样方法分别在宜都市的王家畈镇、聂家河镇和潘家湾乡对楠木资源分布集中地段进行野外实地调查,并记录其生境条件和群落特征。【结果】调查区内发现野生楠木类植物计264株,楠属植物3种,分别为竹叶楠Phoebe faberi、桢楠P.zhennan、湘楠P.hunanensis;润楠属植物4种,分别为润楠Machilus pingii、宜昌润楠M.ichangensis、华润楠M.chinensis、刨花润楠M.pauhoi,其中华润楠、刨花润楠初步确定为宜都市新分布记录种。楠木较多分布在山地比较潮湿的阴坡,坡度为30°~40°,坡位为中坡位和下坡位,海拔在710 m左右,群落类型为常绿或落叶阔叶林的生境条件下,其楠木类植物群落的维管束植物共有71种,隶属41科60属,以樟科和蔷薇科植物比较多,被子植物中双子叶植物占有绝对的优势,高位芽植物在群落中的比重最大。【结论】该调查区内的润楠属植物种群年龄结构相比楠属更合理,大致呈稳定型,而楠属植物种群年龄结构大致呈衰退型。探讨了样地野生楠木数量及群落结构特征,为其天然林保护及种质资源保存提供理论依据,同时对城市景观树种的配置有着重要意义。

Investigation intothe wild Phoebe resources in Yidu city,Hubei province

【Objective】In order to investigate the distribution,population structure and community characteristics of wild Phoebe resources in Yidu city,Hubei province.【Method】The field survey was conducted in Wangjiafan town,Niejiahe town and Panjiawan township,Yidu city,and the habitat conditions and community characteristics were recorded.【Result】264 strains of wild Phoebe plants were found in the survey area,3 species of Phoebe genus were P.hoebe,P.zhennan,P.hunanensis,4 species of Machilus are M.pingii,M.ichangensis,M.chinensis,M.pauhoi,among which M.chinensis and M.pauhoi was initially identified as a new record species in Yidu.They are mostly distributed in the wet and shady slopes of the mountain,with a slope of 30°~40°,the slope position is the mid-slope position and the downhill position,the elevation is about 710 m,and the community type is under the habitat condition of evergreen or deciduous broad-leaved forest.There are 71 species of vascular plants in the Phoebe botanical community,belonging to 41 families and 60 genera.There are many plants of the genus Polygonaceae and R faberi osaceae,and the dicotyledons in the angiosperms have an absolute advantage,and the high bud plants have the largest proportion in the community.【Conclusion】The age structure of Machilus population area is more reasonable than that of Phoebe in the survey,and it is roughly stable,while the age structure of Phoebe genus population is generally declining.The quantity and community structure characteristics of wild Phoebe were discussed,which provided a basis for the protection of natural forests and conservation of germplasm resources,and also had important significance for the allocation of urban landscape tree species.