荒漠植物霸王种群空间分布格局

Spatial Distribution Pattern of Desert Plants Zygophyllum xanthoxylum

通过实地调查,结合相邻格子法取样,应用扩散系数、平均拥挤度、丛生指数、聚块性指数、Cassie.R.M.指标、Morisita指数、负二项参数等指标,对霸王分布格局及其动态进行研究。结果表明:在不同分布区(L和P两大群落)霸王种群均表现为集群分布,且聚集强度较高,其聚集强度依分布区和选取样地的不同而表现出一定的差异,排序为:L1>L3>L2>P1>P3>P2;L群落的聚集强度明显高于P群落,处于相对稳定的状态,即随着霸王自身种子的散落和根茎的繁殖,其种群的聚集程度逐渐增强,群落逐渐趋于稳定。

Based on the field survey and integrated with contiguous grid sampling, the dynamic spatial distribu- tion pattern of Zygophyllum xanthoxylum populations was analyzed with dispersion coefficient, average clumping in- dex, aggregation index, Cassie index, Morisita index, and negative binomial indexes. The results showed that the spatial distribution pattern of Z. xanthoxylum populations in different distribution areas （ in both community L and community P） was clustering distribution with high aggregation intensity. There was difference in the aggregation intensity between the two distribution areas and among the sample plots. The order of the aggregation intensity was L1 〉 L3 〉 L2 〉 P1 〉 P3 〉 P2. The aggregation intensity of the L community was obviously higher than that of the P community, indicating the L community was in the stable stage, i. e. , along with the seed scattering and the plant rhizome reproducing, the aggregation intensity gradually strengthened and community stability gradually increased.