天然红海榄支柱根的空间连接与分形表征
Study on Spatial Connection and Fractal Characteristics of Prop Roots of Natural Rhizophora Stylosa
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摘要: 以广东湛江特呈岛红树林自然保护区内的红海榄纯林、红海榄+木榄、红海榄+白骨壤、红海榄+木榄+白骨壤混交林4种群落类型为对象,运用最小距离指数、连接度指数分析红海榄支柱根的空间连接和分布规律;同时,采用分形维数与拓扑指数确定红海榄支柱根的分形特征,分析根系分支状况以及分形特征与支柱根性状之间的相关性。结果表明:红海榄同级支柱根之间的空间连接程度不高,近于随机分布格局;4种群落类型中红海榄支柱根均具有较好的分形特征,分形维数为1.468 5 1.554 5,具有较强的利用与占据生态空间的能力;红海榄支柱根拓扑结构复杂,拓扑指数为0.366 4 0.448 5,接近叉状分支模式,有利于扩展生态空间和增加植株的稳定性;根系分形维数与支柱根数量、平均连接长度等性状之间的相关关系显著。Abstract: Four types of community (Rhizophora stylosa pure forest, R. stylosa+Bruguiera gymnorrhiza mixed forest, R. stylosa+Avicennia marina mixed forest, and R. stylosa+B. gymnorrhiza+A. marina mixed forest) in Techengdao Mangrove Nature Reserve, Zhanjiang of Guangdong Province, were used to analyze the spatial connection and distribution pattern of R. stylosa prop roots by nearest neighbor index and connectivity index. The fractal characteristics of prop roots and the correlation coefficients among fractal dimension, rooting characteristics and topological index were discussed by means of fractal dimension and topological indices. The results are as follows. The spatial connection among the same grade R. stylosa prop roots in different community types is not strong, and the same grade R. stylosa prop roots follows a randomized distribution pattern. The R. stylosa prop root in different communities has good fractal characteristics, the fractal dimension is between 1.468 5-1.554 5, revealing strong ability to occupy and utilize the ecological space of R. stylosa roots. The topological structure of R. stylosaa roots is complicated, the topological index is between 0.366 4-0.448 5, and the root branching is dichotomous-shaped, which is beneficial to the root volume of space explored. There is a significant correlation between the fractal dimension and topological parameters, and it also shows a significant relationship between fractal abundance and total root number and average link length respectively.
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Key words:
- Rhizophora stylosa
- / prop roots
- / nearest neighbor index
- / connectivity index
- / fractal dimension
- / topological index
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