造纸废水灌溉对芦苇生长和土壤质量的影响及综合评价

Effect and comprehensive evaluation of papermaking wastewater irrigationon reed growing and soil quality

为全面客观评价废水灌溉对辽宁双台河口湿地的影响,通过构建小试装置模拟盘锦双台河口湿地,分析造纸废水灌溉条件下芦苇不同生长期湿地各指标变化规律,采用粗糙集理论综合评价造纸废水灌溉对芦苇湿地影响。结果表明,造纸废水灌溉提高了芦苇植株茎粗、株高、叶面积及生物量,芦苇各生长指标与废水灌溉浓度正相关,不同灌溉浓度各指标值间存在显著差异;废水灌溉后,土壤中有机质、TN、TP含量随着灌溉浓度的增大而增加,但各灌溉浓度间差异不显著;废水灌溉后土壤中重金属含量均显著增加,且废水浓度越大,土壤中重金属含量越多。利用粗糙集方法对不同造纸废水浓度灌溉下的芦苇湿地影响程度做综合评分,灌溉浓度300mg/L的综合得分为0.802 6;175、50mg/L的综合得分分别为0.694 1、0.681 3;0mg/L的综合得分为0.401 3,即现有灌溉条件下,废水浓度越大,对芦苇湿地的影响综合评分越高,虽然会造成更多重金属累积,但总体上仍更有利于芦苇的生长与发育。

In order to evaluate the effect of papermaking wastewater irrigation in Shuangtaihekou Wetland comprehensively and and objectively,we simulated Shuangtaihekou Wetland by building experimental device schemes.to analysis The changes of reed growth indexes caused by wastewater irrigating at various growth period.Meanwhile,the Rough Set method,was adopted to evaluate the effect of reed wetland by papermaking wastewater irrigating.The results showed that the concentration of papermaking wastewater for irrigation was positively correlated with the reeds growth indexes,soil nutrient content and soil heavy metal contents.Each reed growth index,including reed plant stem diameter,plant height,leaf area and biomass,displayed significant difference under different concentrations of wastewater for irrigation.However,soil nutrients content such as organic matter,TN,and TP,showed no significant difference with the change of the concentration of.And the heavy metal content of the soil was changed significantly with the change of wastewater concentration.Composite score was made for the impact on reed wetlands at different concentrations of papermaking wastewater for irrigation by Rough Set method.When the concentration of irrigation water was 300,150,50 and 0mg/L,they scored 0.802 6,0.694 1,0.681 3and 0.401 3,respectively.In conclusion,under thecurrent irrigation status,the greater the concentration of waste water,the higher the composite score.Therefore,despite the accumulation of heavy metals in the soil,the papermaking wastewater irrigation remains favorable in general for the growth and development of reed.