以石羊河中游典型河岸植物芦苇(Phragmites australis)为对象,采用点格局分析法研究了以芦苇为优势种或伴生种群落中芦苇的空间分布格局特征,并对芦苇和沙蒿(Artemisia desertorum)、梭梭(Haloxylon ammodendron)、变异黄耆(Astragalus variabilis)及蓼子朴(Inula salsoloides)的种间关联性进行了分析,揭示了芦苇的空间分布格局和种间关联性与河岸距离的关系。结果表明:在5 m的一系列空间尺度上,以芦苇为优势种的群落中,距河岸近的芦苇呈随机分布,而距河岸远的芦苇在小尺度上为集群分布,较大尺度上变为随机分布;以芦苇为伴生种的群落中,芦苇均表现出集群分布特征,且距离河岸近的芦苇聚集程度大于距离河岸远的芦苇。芦苇和沙蒿在较大尺度上具有正关联关系,距离河岸越远,芦苇和沙蒿呈正关联的尺度越小,关联程度越强。芦苇和变异黄耆在4.1~5 m尺度上具有负关联关系,和蓼子朴在1.5~4.6 m尺度上具有正关联关系。
For exploring the relationship between population characteristics of Phragmites australis in different communities and the distance between them and river bank, spatial distribution pattern of P.australis and spatial association between P. australis and Artemisia desertorum, Haloxylon ammodendron, Astragalus variabilis, Inula salsoloides were analyzed using point pattern analysis. In a 5 m series spatial scale, the P.australis population as dominant species was characterized by random distribution near the river bank, and by clumped distribution in small scale while random distribution in large scale far from the river bank. However, P.australisas companion species was characterized by clumped distribution and the clumping degree is stronger with short distance to river bank. There is a positive association between P.australis and A.desertorum and the association degree is stronger with far from river bank. There is a negative association between P.australis and A.variabilis at 4.1-5 m, and positive association between P.australis and I.salsoloides at 1.5-4.6 m. The results have an important significant on protecting and repairing riparian vegetation of Shiyanghe River.
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