黄牛木种群空间分布格局研究

为促进黄牛木Cratoxylum cochinchinense在珠三角地区生态建设中的推广和应用,采用样方调查法,于2016-2017年在广州市和台山市3个黄牛木天然林集中分布区布设样地,通过绘制种群空间分布点位置图,结合方差均值比率法和聚集度指标,分析种群的空间分布类型、聚集程度,从而揭示黄牛木种群的空间分布特性、生长动态及演替规律。结果表明:(1)研究样地内植物种类共有122种,隶属49科96属,样地群落丰富度表现为石花山样地>茶山样地>白云山样地,群落植被分层明显,各层的种数表现为灌木层(41种)>乔木层(40种)>草本层(29种)>层间植物(12种);(2)不同调查样地,黄牛木种群均表现为聚集分布,聚集程度为白云山样地>茶山样地>石花山样地;(3)不同地形条件,黄牛木种群对坡向具有一定的选择性,聚集程度表现为阴坡优于阳坡;(4)不同发育阶段,黄牛木种群从幼树至老树的时间序列上,其空间分布格局表现为从聚集至均匀至随机,随着发育程度的增加,种群具有扩散的趋势。

Spatial Distribution of Cratoxylum cochinchinense Population

In 2016,sample plots were established in concentrated distributed Guangzhou and Taishan,Guangdong province by typical sampling method.Investigations were carried out on DBH,crown diameter,tree height,clear bole height of C.cochinchinense tree with height>1.3 m,and ground diameter crown diameter and tree height of C.cochinchinense tree with height<1.3 m.The result demonstrated that that there were 122 plant species,belonging to 49 families and 96 genera.Vegetation stratification of the communities was obviously as follows:shrub layer(41 species)>tree layer(40 species)>herb layer(29 species)>interlayer plant(12 species).The surveyed C.cochinchinense population showed aggregation distribution in different plots.Aggregation of C.cochinchinense was more at shady slope.Spatial distribution C.cochinchinense population changed from aggregation to even,indicating scattered distribution with age.