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为了进一步探究湿地的净化机制和生物地球化学循环过程,2004～2006年通过连续3 a对武汉动物园暴雨型人工湿地进行原位定期监测,主要研究了湿地孔隙水中铁锰的时空分布特征及其对氧化还原电位(oxidation reduction potential,ORP)的影响.结果表明,暴雨型湿地水位出现周期性的波动,水位的变化范围是-10～30 cm,孔隙水中ORP的变化范围是-120～220 mV,主要发生了硫、铁和锰体系的氧化和还原.全锰、全铁和亚铁离子的浓度变化范围分别是0.60～2.35、0.75～1.89和0.20～1.25 mg·L-1,春夏季大于秋冬季,而硫酸盐的浓度在秋冬季大于春夏季,亚铁与全铁的比值季节性差异较小.在湿地孔隙水垂直方向上,ORP和pH沿垂直方向由表层10 cm到地下50 cm逐渐减少,全铁、亚铁和全锰的离子浓度则不断升高(表层上覆水除外).通过相关性分析表明,湿地孔隙水中的ORP与亚铁和全锰的浓度相关性极显著,与全铁的相关性不显著(R=-0.169,p<0.000 1),均为负相关,其相关系数的大小顺序依次为全锰、亚铁和全铁.
In order to further explore the purification mechanism and biogeochemical cycle of wetlands, the in-situ periodic monitoring of heavy rain-type constructed wetlands in Wuhan Zoo from 2004 to 2006 was conducted to study the spatial and temporal distribution of iron and manganese in pore water of wetlands (ORP). The results show that the water level fluctuates cyclically in rainstorm wetlands, the range of water level is -10 ~ 30 cm, the range of ORP in pore water is -120 ~ 220 mV, The oxidation and reduction of sulfur, iron and manganese systems occurred mainly in the range of 0.60 ~ 2.35, 0.75 ~ 1.89 and 0.20 ~ 1.25 mg · L-1, respectively, In winter, the concentration of sulfate was higher than that of spring and summer in autumn and winter, and the seasonal difference of ferrous and total iron was small.With the vertical direction of pore water, ORP and pH gradually increased from 10 cm to 50 cm in the vertical direction (Iron, manganese, manganese, manganese, manganese, manganese, manganese, manganese, manganese, manganese, manganese and manganese) in the wetland pore water (correlation with the concentration of ferrous and total manganese was extremely significant, (R = -0.169, p <0.000 1), all of them were negatively correlated with total iron, followed by all manganese, ferrous and total iron in the order of their correlation coefficients.