湖北省远安县野生楠木群落特征

  目的  探索湖省北远安县野生楠木群落的物种组成、结构和特征，完善宜昌地区野生楠木资源分布记录。  方法  采用样方法对湖北省远安县的鸣凤镇、花林寺镇、嫘祖镇的野生楠木群落进行实地考察，记录野生楠木的种类分布和生境条件，并运用群落生态学的方法进行统计分析。  结果  ①调查区内野生楠木类植物有5种，包括楠属Phoebe植物2种，分别为白楠 Ph. neurantha和竹叶楠 Ph. faberi；润楠属Machilus 植物3种，分别是宜昌润楠 M. ichangensis、刨花润楠 M. pauhoi和多脉润楠 M. multinervia，其中多脉润楠和刨花润楠被初步确定为远安县新分布记录种。②调查区楠木类植物群落的维管束植物共有73种，隶属于35科61属，其中21科为单属单种。群落中的高位芽植物分布最多，地下芽和地面芽植物较少；物种胸径级主要为Ⅲ级(5.0 cm ≤ D_BH＜7.5 cm)或Ⅳ级(7.5 cm ≤ D_BH＜22.5 cm)，有少量Ⅴ级（D_BH≥22.5 cm)树种。Shannon-Wiener指数(H′)、Simpson优势度指数(D_s)和均匀度指数(J_sw)在3个乡镇之间均无显著性差异(P＞0.05)，只有Margalef丰富度指数(R)存在显著差异(P＜0.05)。  结论  湖北省远安县野生楠木资源丰富，物种多样性指数高，群落结构合理，区域内野生楠木资源现状较好，但应进一步加强保护。图3表3参28

Community characteristics of the wild Phoebe and Machilus plants in Yuan’an County,Hubei Province

  Objective  This study aims to explore the species composition, structure and characteristics of wild Phoebe and Machilus communities in Yuan’an County, Hubei Province, and improve the distribution record of wild Phoebe and Machilus resources in Yichang area.  Method  The field investigation of the wild Phoebe and Machilus communities in Mingfeng Town, Hualinsi Town and Leizu Town of Yuan’an County was carried out by using quadrat method to record the habitat conditions and species distribution of Phoebe and Machilus plants, and the method of Community Ecology was used for statistical analysis.  Result  (1) There were 2 species of Phoebe and 3 species of Machilus plants in the survey area, including Phoebe neurantha and Ph. faberi in Ph. genera, and M. ichangensis, M. pauhoi and M. ultinervia in Machilus genera. M. pauhoi and M. multinervia were identified as new distribution record species in Yuan’an County. (2) There were 73 species of vascular plants belonging to 35 families and 61 genera, among which 21 families were single genera and single species. The high bud plants had the largest distribution in the community, while the underground and surface buds had the least. The DBH levels of most species were in grade Ⅲ (5.0 cm ≤ D_BH＜7.5 cm)and Ⅳ(7.5 cm ≤ D_BH＜22.5 cm), with a few species in grade Ⅴ（D_BH≥22.5 cm). Shannon-Wiener diversity index H′, Simpson dominance index D_s and evenness index J_sw showed no significant difference among the three townships(P＞0.05), but Margalef richness index R did(P＜0.05).  Conclusion  Yuan’an County is rich in wild Phoebe and Machilus resources, with high species diversity index and reasonable community structure. However, the protection of local wild Phoebe and Machilus resources should be further strengthened. Ch, 3 fig. 3 tab. 28 ref.]