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首页> 外文期刊>Journal of Environmental Science and Health >Evapotranspiration from pilot-scale constructed wetlands planted with Phragmites australis in a Mediterranean environment
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Evapotranspiration from pilot-scale constructed wetlands planted with Phragmites australis in a Mediterranean environment

机译：地中海环境中种植芦苇的中试人工湿地的蒸散

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摘要

This article reports the results of evapotranspiration (ET) experiments carried out in Southern Italy (Sicily) in a pilot-scale constructed wetland (CW) made of a combination of vegetated (Phragmites australis) and unvegetated sub-surface flow beds. Domestic wastewater from a conventional wastewater treatment plant was used to fill the beds. Microclimate data was gathered from an automatic weather station close to the experimental plant. From June to November 2009 and from April to November 2010, ET values were measured as the amount of water needed to restore the initial volume in the beds after a certain period. Cumulative reference evapotranspiration (ET_0) was similar to the cumulative ET measured in the beds without vegetation (ET_(con)), while the Phragmites ET (ET_(phr)) was significantly higher underlining the effect of the vegetation. The plant coefficient of P. australis (K_p) was very high (up to 8.5 in August 2009) compared to the typical K_c for agricultural crops suggesting that the wetland environment was subjected to strong "clothesline" and "oasis" effects. According to the FAO 56 approach, K_p shows different patterns and values in relation to growth stages correlating significantly to stem density, plant height and total leaves. The mean Water Use Efficiency (WUE) value of P. australis was quite low, about 2.27 g L~(-1), probably due to the unlimited water availability and the lack of the plant's physiological adaptations to water conservation. The results provide useful and valid information for estimating ET rates in small-scale constructed wetlands since ET is a relevant issue in arid and semiarid regions. In these areas CW feasibility for wastewater treatment and reuse should also be carefully evaluated for macrophytes in relation to their WUE values.
机译：本文报告了在意大利南部（西西里岛）由植被（无盖芦苇）和无植被地下流床组成的中试规模人工湿地（CW）中进行的蒸散（ET）实验的结果。来自常规废水处理厂的生活废水用于填充床。小气候数据是从靠近实验工厂的自动气象站收集的。从2009年6月至11月以及从2010年4月至2010年11月，将ET值测量为一定时期后恢复床层初始体积所需的水量。累积参考蒸散量（ET_0）与在没有植被的床上测得的累积蒸散量（ET_（con））相似，而芦苇的蒸散量（ET_（phr））明显更高，这说明了植被的影响。与农作物的典型K_c相比，澳大利亚假单胞菌的植物系数（K_p）非常高（2009年8月高达8.5），表明湿地环境受到强烈的“晾衣绳”和“绿洲”作用。根据FAO 56的方法，K_p表现出与生长阶段有关的不同模式和值，而这些阶段和值与茎密度，植物高度和总叶量显着相关。南极假单胞菌的平均水分利用效率（WUE）值很低，约为2.27 g L〜（-1），这可能是由于无限的水供应和缺乏植物对节水的生理适应性所致。由于ET是干旱和半干旱地区的一个相关问题，因此该结果为估算小型人工湿地的ET率提供了有用和有效的信息。在这些地区，还应仔细评估大型水生植物废水处理和回用的CW可行性及其WUE值。

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