Many removal mechanisms in treatment wetlands involve absorption to organic matter. Optical properties and DOC levels of waters entering and exiting 4 treatment wetland systems in Orange County, Southern California, were measured to characterize the dissolved organic matter pool. Average DOC levels decreased between the inlets and outlets, except for Forge Street (FS), which increased. For 3 wetlands, absorption coefficients decreased between inlet and outlet; the exception was FS, which increased. Average spectral slopes for the inlets and outlets were similar. Average intensities of terrestrial humic peaks A and C from 3D EEM fluorescence spectra decreased between the inlets and outlets for most wetlands. No EEM protein peaks were observed. Average flu/abs ratios for inlets and outlets were similar (high point for FS inlet excluded), suggesting chromophoric dissolved organic matter (CDOM) of a similar composition was present. The average FI value for the inlets and outlets was ∼1.5, consistent with terrestrial sources of CDOM. Average BIX values for the inlets and outlets were ∼0.8, suggesting limited contributions from autochthonous production of CDOM. Dominant plant species in the wetlands were cattail and bulrush. Humic peaks A and C, along with protein peaks, were observed in plant leachates. Protein peaks rapidly degraded with solar simulator irradiation. Results indicate that most of the wetlands are a net sink for CDOM, possibly due to absorption to sediments. The FS wetland appears to have a source of non-CDOM optically active organic carbon, possibly from a pollutant.

中文翻译：

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美国南加州人工水处理湿地系统中发色溶解有机物（CDOM）和溶解有机碳（DOC）含量的光学性质。

处理湿地的许多清除机制都涉及对有机物的吸收。测量了南加州橙县的4种处理湿地系统进出水的光学特性和DOC水平，以表征溶解的有机物库。进口和出口之间的平均DOC水平下降，但Forge Street（FS）上升了。对于3个湿地，入口和出口之间的吸收系数降低；FS是例外，它增加了。入口和出口的平均光谱斜率相似。在大多数湿地的入口和出口之间，来自3D EEM荧光光谱的地面腐殖质峰A和C的平均强度降低。没有观察到EEM蛋白峰。进风口和出风口的平均流感/绝对比值相似（不包括FS进口的高点），提示存在类似组成的发色溶解有机物（CDOM）。进口和出口的平均FI值约为1.5，与CDOM的地面来源一致。进口和出口的平均BIX值约为0.8，表明CDOM的本地生产贡献有限。湿地的主要植物物种是香蒲和芦苇。在植物渗滤液中观察到腐殖质峰A和C以及蛋白质峰。蛋白质峰会随着太阳模拟器的照射而迅速降解。结果表明，大多数湿地是CDOM的净汇，可能是由于对沉积物的吸收。FS湿地似乎有可能来自污染物的非CDOM光学活性有机碳源。进口和出口的平均FI值约为1.5，与CDOM的地面来源一致。进口和出口的平均BIX值约为0.8，表明CDOM的本地生产贡献有限。湿地的主要植物物种是香蒲和芦苇。在植物渗滤液中观察到腐殖质峰A和C以及蛋白质峰。蛋白质峰会随着太阳模拟器的照射而迅速降解。结果表明，大多数湿地是CDOM的净汇，可能是由于对沉积物的吸收。FS湿地似乎有可能来自污染物的非CDOM光学活性有机碳源。进口和出口的平均FI值约为1.5，与CDOM的地面来源一致。入口和出口的平均BIX值约为0.8，这表明CDOM的自发生产贡献有限。湿地的主要植物物种是香蒲和芦苇。在植物渗滤液中观察到腐殖质峰A和C以及蛋白质峰。蛋白质峰会随着太阳模拟器的照射而迅速降解。结果表明，大多数湿地是CDOM的净汇，可能是由于对沉积物的吸收。FS湿地似乎有可能来自污染物的非CDOM光学活性有机碳源。提示CDOM的本地生产贡献有限。湿地的主要植物物种是香蒲和芦苇。在植物渗滤液中观察到腐殖质峰A和C以及蛋白质峰。蛋白质峰会随着太阳模拟器的照射而迅速降解。结果表明，大多数湿地是CDOM的净汇，可能是由于对沉积物的吸收。FS湿地似乎有可能来自污染物的非CDOM光学活性有机碳源。表明CDOM的本地化生产贡献有限。湿地的主要植物物种是香蒲和芦苇。在植物渗滤液中观察到腐殖质峰A和C以及蛋白质峰。蛋白质峰会随着太阳模拟器的照射而迅速降解。结果表明，大多数湿地是CDOM的净汇，可能是由于对沉积物的吸收。FS湿地似乎有可能来自污染物的非CDOM光学活性有机碳源。