Fractal geometry and root system structures of heterogeneous plant communities
Fractal geometry and root system structures of heterogeneous plant communities
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DOI：
10.1007/s11104-004-3981-2
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发表时间：
2005-05-01
期刊：
影响因子：
4.9
通讯作者：
Block, A
中科院分区：
文献类型：
--
作者：
Dannowski, M;Block, A
地下植物生长在结构多样性方面是众所周知的。同样，地下的增长呈现出复杂程度不同的异质结构的马赛克。本研究采用沟槽剖面法，将异质植物群落的根系结构记录为完整系统。根图像的分形维数计算从图像文件的盒计数法。这种方法允许这种协会的结构复杂性进行比较植物群落之间，就其潜在的土壤资源的收购和利用。不同生境类型的植物群落地下结构复杂性存在明显和部分显著差异（分形维数在1.46 ± 0.09和1.71 ± 0.05之间）。异质性植物群落的大小对根系结构的分形维数有重要影响。结构异质性变得特别明显（分形维数之间的1.32和1.77），当分析许多小单位的复杂的根系协会。在较大的植物群落中，各种各样的地下结构被完整地记录下来，整合了单个子结构的具体特征。这样，极端分维就会丢失，多样性就会减少。因此，分析较大的单位的根系协会提供了一个一般知识的复杂性根系结构的异质植物群落。
Above-ground plant growth is widely known in terms of structural diversity. Likewise, the below-ground growth presents a mosaic of heterogeneous structures of differing complexity. In this study, root system structures of heterogeneous plant communities were recorded as integral systems by using the trench profile method. Fractal dimensions of the root images were calculated from image files by the box-counting method. This method allows the structural complexity of such associations to be compared between plant communities, with regard to their potentials for soil resource acquisition and utilization. Distinct and partly significant differences are found (fractal dimension between 1.46 +/- 0.09 and 1.71 +/- 0.05) in the below-ground structural complexity of plant communities, belonging to different biotope types. The size of the heterogeneous plant community to be examined has an crucial influence on the fractal dimension of the root system structures. The structural heterogeneity becomes particularly evident (fractal dimensions between 1.32 and 1.77) when analysing many small units of a complex root system association. In larger plant communities, a broad variety of below-ground structures is recorded in its entirety, integrating the specific features of single sub-structures. In that way, extreme fractal dimensions are lost and the diversity decreases. Therefore, the analysis of larger units of root system associations provides a general knowledge of the complexity of root system structures for heterogeneous plant communities.