以广东湛江特呈岛不同红海榄群落为研究对象,运用最近邻体分析法对特呈岛红树林保护区3种不同红树林群落中红海榄支柱根的空间分布进行分析,并用标准正态分布检验实际CE指数偏离1的显著性,同时运用威布尔分布、正态分布、伽玛分布3种模型对红海榄纯林、红海榄+白骨壤混交林以及红海榄+木榄混交林中红海榄支柱根的最小距离分布进行拟合及检验。结果表明:红海榄支柱根在3种群落类型中其分布格局呈聚集分布,标准正态分布检验结果显示其CE值与理论值之间的偏离达极显著水平(u >2.58);3种概率密度函数对不同群落类型中红海榄支柱根的最小距离分布的拟合效果不同,其中威布尔函数拟合效果最好(显著水平α=0.01)。最近邻体分析法及威布尔函数能较好地对红海榄支柱根的空间分布格局进行估计。

Based on the natural Rhizophora Stylosa of different communities such as R.stylosa pure forest,R.stylosa + Bruguiera gymnorrhiza and R.stylosa + Avicennia marina in mangrove forest nature reserve conservation zone in Techeng Island,the paper analyzed the spatial structure of Rhizophora stylosa prop roots using the Nearest Neighbor Analysis,and tested the deviation of actual CE index from 1 by using the standard normal distribution while three probability models i.e Normal distribution,Weibull distribution and Gamma distribution were applied to analyze the structure features of Rhizophora stylosa prop roots,and the prop root distributions were compared.The results showed that Rhizophora prop roots in three kinds of community types were aggregated distribution pattern(u >2.58);the fitting was different in different communities with 3 distributions,and the Gamma distribution model had the best fitness to express the spatial structure of Rhizophora prop roots(α=0.01).The nearest neighbor analysis was good to estimate the spatial distribution patterns.