湿地土壤及芦苇对造纸废水灌溉的响应

Simulative Study on Effect of Irrigation with Papermaking Wastewater on Growth of Wetland Reeds and Soil

为利用造纸废水促进辽河三角洲湿地生态修复,在沈阳农业大学综合试验场内构建小试装置模拟盘锦双台河口天然湿地,研究造纸废水灌溉对土壤有机质含量及芦苇生长作用影响效果,为辽河三角洲湿地提供可参考的废水灌溉方式。结果表明,废水灌溉有利于土壤有机质的累积,能促进湿地芦苇生长;不同灌溉方式对芦苇作用效果不同。废水灌溉组有机质含量显著好于清水灌溉组,全生长期灌溉组有机质含量最高。废水不同灌溉方式下土壤有机质垂直分布规律为：0~10 cm〉10~30 cm〉30~50 cm。废水不同灌溉方式对芦苇各生长指标影响效果存在差异。不同灌溉浓度下,生长指标与有机质含量相关性显著。废水经过湿地系统后,湿地出水水质得到一定改善。

A simulative study was described, which was intended for proving the potential application of papermaking wastewater to wetlands in the Liaohe River Delta, with the emphasis on the influence of papermaking wastewater irrigation on the growth of reeds and organic matter of the soil. The results showed that papermaking wastewater irrigation was beneficial to accumulation of soil organic matter, and additionally promote the growth of reeds; however, the effects also depended on the irrigation modes. As to organic matter content of the soil, the test group using wastewater irrigation resulted in better results compared to that of clean water irrigation. Organic matter content was maximized in the test group into which wastewater irrigation had been applied during the whole growth period; and with regard to depth distribution, organic matter content in the soil decreased vertically downwards. There existed a significant correlationship between the reeds growth index and organic matter content irrespective of the difference of wastewater concentration applied.