中文摘要：

文章研究了冬季北运河（通州段）沿岸人工湿地植物的根际土壤微生物群落结构。选择千屈菜、香蒲、鸢尾、芦苇等4种植物作为研究对象,采用磷脂脂肪酸生物标记法对其根际土壤微生物群落结构进行剖析。结果发现,4种湿地植物根际微生物PLFAs总量存在明显的差异,千屈菜的PLFAs总量最低,且多样性最小;相较于香蒲和鸢尾,芦苇根际土壤微生物的均匀度与多样性都较小。对根际土壤各类群微生物比例进行分析发现,不同植物根际土壤各类群微生物的含量呈现出显著性的差异,其中鸢尾根际土壤厌氧微生物比例最高,不利于冬季有机污染物的好氧分解。综合考虑各种因素,相较于千屈菜、鸢尾和芦苇而言,种植香蒲更有利于寒冷地区人工湿地的实际运行。主成分分析的结果表明,千屈菜和香蒲对根际土壤微生物群落结构的影响区分很明显,鸢尾和芦苇差异变化相近,差异不明显。文章从冬季不同湿地植物根际土壤微生物群落结构多样性角度对寒冷地区人工湿地中植物的选择提供了一定的依据。

英文摘要：

Investigation of constructed wetlands in the Beiyunhe catchment during winter was carried out focusing on the microbial community structure of rhizosphere soil. Four kinds of emergent macrophytes,including Lythrum salicaria,Typha angustifolia,Iris tectorum and Phragmites communis,were chosen for the study in which phospholipid fatty acid biomarker（PLFAs）was used. Findings of the study indicated that there was significant difference among those plants in terms of total PLFAs amount. With respect to the proportions of each microbial group in the rhizo-sphere,different kinds of emergent macrophytes had remarkable effects on each microbial group in rhizo-sphere soil,among others,Iris tectorum had the highest proportion of anaerobic bacteria in the rizosphere microbial group which was not conducive to aerobic decomposing of pollutants in winter season. Taking into account the various influencing factors,the paper suggested Typha angustifolia among others,was the favorable plant for the constructed wetlands in the circumstances of cool weather. Furthermore,the principle component analysis（PAC）showed that Lythrum salicaria and Typha angustifolia had significant different effects on the microbial community structure,while very slight difference of effects of Iris tectorum and Phragmites communis on the microbial community structure had been noted. In general,results of the investigation could be used for reference in selection of proper emergent plants for building constructed wetlands in the frigid zone.