造纸废水灌溉对湿地土壤和芦苇中总磷迁移的影响

Effect of papermaking wastewater irrigation on the total phosphorus migration in soil and wetland reed

在沈阳农业大学综合试验场内构建小试装置模拟辽河口天然芦苇湿地,对不同生育期湿地土壤和芦苇总磷含量的变化进行研究,分析废水灌溉条件下湿地土壤总磷的迁移特征。结果表明:不同废水质量浓度灌溉条件下,随着土层深度增加,土壤总磷含量变化趋势基本相同,在5~10cm土层中总磷含量最高。废水灌溉组土壤总磷含量在土层剖面分布规律为0~5>5~10>20~40>40~60>10~20cm。废水质量浓度为300mg/L处理的土壤总磷含量变化量最大,175mg/L处理最小。芦苇总磷含量随生长期变化趋势为成熟期>拔节期>抽穗期>展叶期>发芽期。灌溉组芦苇中总磷含量高于对照组,总磷含量在芦苇内的分布特征为:茎>叶>根>穗。相关性分析表明,土壤总磷、总氮、有机质及芦苇总磷呈极显著正相关关系,总磷与pH相关不显著。

A small pilot plant was built to simulate Liaohe river estuary natural reed wetland in comprehensive test venue at Shenyang Agricultural University and investigate the variation of total phosphorus content in soil and reeds at different growth stages.The results show that：Under different concentrations of wastewater irrigation,with the increase of soil depth,changes of soil total phosphorus content displayed the same trend,and the highest total phosphorus content existed at 5-10 cm soil layer.Soil phosphorus content in waste water irrigation group distribution in soil profiles was：0-55-1020-4040-6010-20 cm.Total phosphorus content variation irrigation concentration reached maximum at 300mg/L soil treatment and minimum at 175mg/L.Reeds growing trend with the total phosphorus content was maturejointing stageheading stageleaf stagegermination stage.Irrigation group reeds phosphorus content was higher than in control group,and its content distribution in the reed was stemleafrootear.Correlation analysis showed that soil total phosphorus,total nitrogen,total phosphorus organic matter and reed showed significant positive correlation while the correlation between pH and total phosphorus was not significant.