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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Stomatal Conductance Measurement for Toxicity Assessment in Zero-Effluent Constructed Wetlands: Effects of Landfill Leachate on Hydrophytes
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Stomatal Conductance Measurement for Toxicity Assessment in Zero-Effluent Constructed Wetlands: Effects of Landfill Leachate on Hydrophytes

机译：零排放人工湿地毒性评估中的气孔电导率测量：垃圾渗滤液对水生植物的影响

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In this research, we explore for the first time the use of leaf stomatal conductance (gs) for phytotoxicity assessment. Plants respond to stress by regulating transpiration. Transpiration can be correlated with stomatal conductance when the water vapor pressure gradient for transpiration is constant. Thus, our working hypothesis was that the gs measurement could be a useful indicator of the effect of toxic compounds on plants. This lab-scale study aimed to test the measurement of gs as a phytotoxicity indicator. Our model plants were two common hydrophytes used in zero-effluent constructed wetlands for treating landfill leachate. The toxic influence of two types of leachate from old landfills (L1, L2) on common reed (Phragmites australis (Cav.) Trin. ex Steud.) and sweet flag (Acorus calamus L.) was tested. The gs measurements correlated well with plant response to treatments with six solutions (0 to 100%) of landfill leachate. Sweet flag showed higher tolerance to leachate solutions compared to common reed. The estimated lowest effective concentration (LOEC) causing the toxic effect values for these leachates were 3.94% of L1 and 5.76% of L2 in the case of reed, and 8.51% of L1 and 10.44% of L2 in the case of sweet flag. Leachate L1 was more toxic than L2. The leaf stomatal conductance measurement can be conducted in vivo and in the field. The proposed approach provides a useful parameter for indicating plant responses to the presence of toxic factors in the environment.
机译：在这项研究中，我们首次探索了叶片气孔导度（gs）在植物毒性评估中的应用。植物通过调节蒸腾作用来应对压力。当用于蒸腾的水蒸气压力梯度恒定时，蒸腾可以与气孔导度相关。因此，我们的工作假设是gs的测量可能是有毒化合物对植物影响的有用指标。这项实验室规模的研究旨在测试gs的测量作为植物毒性指标。我们的模型植物是在零排放人工湿地中用于处理垃圾渗滤液的两种常见水生植物。测试了两种类型的旧垃圾填埋场（L1，L2）渗滤液对普通芦苇（芦苇芦苇）和甜旗（Acorus calamus L.）的毒性影响。 gs的测量值与工厂对六种垃圾填埋场渗滤液溶液（0％至100％）的处理的响应密切相关。与普通芦苇相比，甜旗对浸出液的耐受性更高。在芦苇的情况下，估计的引起这些浸出液毒性作用的最低有效浓度（LOEC）为L1的3.94％，L2的5.76％，甜旗的L1的8.51％，L2的10.44％。渗滤液L1的毒性比L2高。叶片气孔电导率测量可以在体内和现场进行。所提出的方法为指示植物对环境中存在毒性因子的反应提供了有用的参数。

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