Population structure, diametric distribution and use of Commiphora leptopholoeos (Mart.) JB Gillett in arboreal Caatinga

ABSTRACT The objective of this work was to characterize the population structure, analyze the spatial distribution pattern and identify the potential use of the Commiphora leptopholoeos in the Contendas do Sincorá National Forest, BA. Thus, three disjoint transects of 40 x 160 m were installed for the phytosociological study and spatial distribution and subdivided into 64 plots of 10 x 10 m, for which the density and frequency values of regenerating individuals (dbh < 5 cm), and the density, frequency and basal area of arboreal size were calculated (dbh ≥ 5 cm). The spatial distribution pattern was calculated by the Morisita index, Payandeh’s dispersion index and the Chi-squared test for the different populations. The diametric distribution was in the form of a reverse J-shaped, usually indicate full regeneration with constant seed production, germination and recruitment. The stems of the species were mostly healthy, but with a large tillering percentage and tortuosity below the commercial height, constituting characteristics which favor uses for firewood, stakes and poles. The spatial distribution pattern values of the species for tree size and regeneration point to an aggregate spatial distribution or to a tendency to aggregation.

摘要
本研究旨在阐明巴伊亚州孔滕达斯-辛科拉国家森林公园内细叶没药（Commiphora leptopholoeos）的种群结构特征，分析其空间分布格局，并明确其潜在利用价值。
为此，本研究设置了3条互不重叠的40 m×160 m样带，用于开展植物社会学调查与空间分布格局分析，并将每条样带划分为64个10 m×10 m的样方；在此基础上，统计了更新幼株（胸径<5 cm，胸径全称diameter at breast height，缩写为dbh）的密度与频度值，并计算了乔木级个体（胸径≥5 cm）的密度、频度及胸高断面积。
针对不同种群，本研究采用莫里西塔指数（Morisita index）、帕扬德扩散指数（Payandeh’s dispersion index）及卡方检验（Chi-squared test）计算其空间分布格局。
该物种种群的直径分布呈反向J型，通常预示着种群具备持续的种子生产、萌发与补充更新过程，更新状态良好。
该物种的树干大多健康，但在商品材高度以下存在较高比例的萌蘖与弯曲现象，这些特性使其适合用作薪柴、桩材及杆材。
该物种种群的乔木级个体与更新幼株的空间分布格局指数均显示，其呈聚集型空间分布或存在聚集趋势。