子牙河水系滨岸带植物群落结构及其与环境的关系

目的]以海河流域子牙河水系河流滨岸带植物为对象,研究影响植物群落结构和分布格局的主要环境因子,为相关研究提供依据。方法]2013年6月,在子牙河水系干支流设置了94个滨岸带样地,调查植被结构和海拔、护岸类型、堤外土地利用类型等6个环境因子。结果]子牙河水系滨岸带植物共249种,分属于51科,166属。山区河段滨岸带有199种植物,分属于43科,135属,优势物种有芦苇(Phragmites australis)、蒙古蒿(Artemisia mongolica)、荆条(Vitex negundo)、黄花蒿(Artemisia annua)等;平原河段滨岸带有36种植物,分属于22科35属,优势物种主要有芦苇(P.australis)、反枝苋(Amaranthus retroflexus)等,山区植物丰富度明显高于平原区。结论]海拔高度和堤外土地利用类型与植物群落结构显著相关。水热条件和人类活动压力是影响植被构成的主要成因。

Relationship Between Plant Communities and Environment Factors in Riparian Zone Along Ziya River

Objective] The study aims to find out factors that influence the plant community structure and distribution pattern in the riparian zone along Ziya river, and provide references for related research. Methods] In June, 2013, we investigated plant community structure and six environmental factors in 94 plots including altitude, levee type and land use type outside the levee in the Ziya river system. Results] Totally, we found 249 species, which covers 51 families and 166 genera, of which, 199 species covering 43 families and 135 genera were found in the mountain regions in the mountainous region and 36 species covering 22 families and 35 genera were found in the plain. Phragmites australis, Artemisia mongolica, Vitex negundo, Artemisia annua were the dominant species in the mountain rivers and P. australis, Amaranthus retroflexus in the plain rivers. The species richness in mountain was significantly higher than that in the plain areas. Conclusion] The altitude and the land use type outside levee significantly associated with the plant community structure. Hydrothermal conditions and human activities are the main factors affecting the vegetation composition and spatial distribution.