天然红海榄支柱根空间结构研究

Observation on Spatial Structure of Rhizophora stylosa Prop Roots in Techeng Island

通过对红海榄及其支柱根的定位,利用角尺度、大小比数和最小距离3个参数对特呈岛不同群落的红海榄支柱根空间结构进行研究。结果表明,红海榄纯林、红海榄+白骨壤、红海榄+木榄混交林3种不同群落中红海榄支柱根的平均角尺度分别是0.772、0.692和0.636,大于均匀分布的取值范围[0.475,0.517],属于聚集分布格局;支柱根的直径大小比数和高度大小比数均接近0.5,从直径大小比数来看,在参照支柱根与相邻支柱根的结构单元中,径级分布较均匀;高度大小比数和直径大小比数在描述红海榄各参照支柱根与相邻根之间的生长优势方面具有较强的一致性;3种群落中红海榄支柱根的最小距离分别是2.83、1.00和2.24 cm,平均距离分别是10.54、9.07和8.63 cm。3个结构参数量化了参照支柱根与其相邻根之间的空间关系,对红海榄的有效保护及合理利用具有一定的实际指导意义。

The objective of this study is to investigate the spatial structure of Rhizophora stylosa prop roots in different community types in terms of 3 parameters of the uniform angle index, neighborhood comparison and nearest neighbor by setting the location of R. stylosa prop roots. The results showed that the average uniform angle indices of R. stylosa pure forest, R. stylosa ＋ Avicennia marina and R. stylosa ＋ Bruguiera gymnoihiza savigny mixed forests were 0. 772, 0. 692 and 0.636, respectively, which were larger than the values of 0.475 -0. 517 when they are arranged evenly which showed the aggregated distribution pattern. The diameter neighborhood comparison and height neighborhood comparison of R. stylosa prop roots were all around 0.5. By analyzing R. stylosa prop roots and their close prop roots, the main brace roots and minor brace roots were distributed uniformly according to the diameter neighborhood comparison. There was a good uniform in evaluating the growth potential of R. stylosa prop roots and their close prop roots in terms of the diameter neighborhood comparison and height neighborhood comparison. R. stylosa prop roots in 3 community types had the nearest neighbors of 2.831 1.00 and 2.24 cm, and the average neighbors of 10.54, 9.07 and 8.63 cm, respectively. The determination of the spatial relationship between R. stylosa prop roots and their close prop roots has positive effects on the efficient protection of R. stylosa.