| The Shuangtaihekou Wetland is the second largest reed wetland in Asia. Recently, there has the natural conditions of short rainfall and heavy salinity. There are some paper mill near the werland. A lot of papermaking wastewater can water the wetland from the paper mill. The Shuangtaihekou Wetland is in a heavy water shortage. The papermaking wastewater that have nutrient and moisture can accumulate heavy metals. It is of great significance to evaluate the effect of reed wetland with papermaking wastewater irrigating objectively.In this study we simulate Shuangtaihekou Wetland by building experimental device schemes to analysis the reed change by irrigating different concentration wastewater in various reed growth period. By using the method of Rough Set and AHP, we evaluate the effect of the Reed Wetland by papermaking wastewateirrigating objectively as a whole. The results showed that the concentration of papermaking wastewater for irrigation was positively correlated with the reeds growth index, soil nutrient content and soil heavy metal contents. Each reed growth indexhas significant difference at different concentrations of wastewater for irrigation,that including reed plant stem diameter, plant height, leaf area and biomass. However, the soil nutrientscontent such as organic matter, TN, TP, is no significant difference with the change of the concentration of waste water. And the heavy metal content of the soil has significant changes with the change of concentration.In the article, we have made composite score for the impact of reed wetlands at different concentrations of papermaking wastewater for irrigation by Rough Set and AHP method. When the concentration of irrigation water was 300mg/L, 150mg/L,50mg/L and 0 mg/L, which have scores 0.6897,0.5518,0.4571,0.2862. It can be seen, under the current irrigation, the greater concentration of waste water is 300mg/L Therefore, even cause more accumulation of heavy metals in the soil, but in general, the papermaking wastewater irrigation remain favorable for the growth and development of reed. |
