黄河三角洲滨海湿地芦苇、碱蓬混生群落空间点格局分析

Spatial point pattern analysis of mixed communities of Phragmites australis and Suaeda salsa in coastal wetland of the Yellow River Delta

为了解黄河三角洲滨海湿地芦苇、碱蓬群落内的种群相互关系、多样的生态策略,通过重复取样的调查方法,运用多种汇总统计函数分析了黄河入海口处以黄河河道为基轴向北延伸至海边的三个不同区域的芦苇和碱蓬混生种群的种群结构和空间点格局。结果表明:黄河边碱蓬和芦苇在全部尺度上趋于聚集分布;中部滩涂湿地碱蓬在2-35 cm尺度上呈现聚集分布,在1cm以及36-45cm尺度上呈现随机分布,在其他尺度呈现均匀分布,芦苇在3-4 cm以及15 cm、20 cm尺度上呈现聚集分布,其他尺度上呈现随机分布;近海区域碱蓬在全部尺度上呈现随机分布,芦苇在0-16 cm、21-25 cm以及44-46 cm尺度上呈现随机分布,在其他尺度呈现聚集分布。黄河边芦苇和碱蓬种群种间关系趋于负相关,种群之间相互排斥,在中部滩涂湿地和近海区域两种群无关联,仅在近海区域28-31 cm尺度出现正相关关系。黄河边两种植物的点格局分布以及种间关系与其他两个区域存在明显差异,需进一步开展相关实验深入了解黄河三角洲滨海湿地环境因素对芦苇、碱蓬混生群落点格局的影响。

In order to understand the relationship between Phragmites australis and Suaeda salsa and their diverse ecological strategies in coastal wetlands of the Yellow River Delta,population structure and spatial point pattern of mixed populations of P.australis and S.salsa in three different regions extending from the Yellow River channel to the Bohai Sea were analyzed through the repeated sampling method,using various summary statistics.Results showed that the populations of S.salsa and P.australis near the Yellow River showed clustering pattern on all scales.The S.salsa population in the central tidal flat wetland showed clustering distribution on the scale of 2-35 cm,and random distribution on the scales of 1 cm and 36-45 cm;regular distribution was found on other scales.The P.australis population in the central tidal flat wetland showed clustering pattern on the scales of 3-4 cm,15 cm and 20 cm;random distribution was found on other scales.The S.salsa population in inshore area showed random distribution on all scales;the P.australis population showed random distribution on the scales of 0-16 cm,21-25 cm and 44-46 cm;clustering distribution was found on other scales.The interspecific relationship between P.australis and S.salsa near the Yellow River tended to be negatively correlated,and the populations were mutually exclusive.There was no correlation between the two populations in the central tidal flat wetland and the inshore area,and positive correlation only occurred on the scale of 28-31 cm.The spatial point patterns and interspecific relationships between the two populations near the Yellow River were significantly different from the other two areas.Further experiments are needed to understand the impact of environmental factors of coastal wetlands in the Yellow River Delta on the pattern of mixed communities of P.australis and S.salsa.