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首页> 外文期刊>The Science of the Total Environment >Effects of vegetation types on water-extracted soil organic matter (WSOM) from riparian wetland and its impacts on riverine water quality: Implications for riparian wetland management
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Effects of vegetation types on water-extracted soil organic matter (WSOM) from riparian wetland and its impacts on riverine water quality: Implications for riparian wetland management

机译：植被类型对河岸湿地水分提取的土壤有机质（WSOM）的影响及其对河流水质的影响：对河岸湿地管理的启示

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Riparian wetlands play important roles in the enhancement of water quality by controlling nonpoint source pollution and protecting aquatic ecosystems. In the present study, we surveyed and identified vegetation types in riparian wetlands, evaluated how vegetation types influence spatial patterns of water-extracted soil organic matter (WSOM) from riparian wetland, and probed the impacts of riparian fluorescent WSOM on fluorescent dissolved organic matter (FDOM) and water trophic states in river ecosystems. We used absorption and excitation-emission-matrix (EEM) fluorescence spectroscopy to characterize the optical properties of riparian WSOM and riverine DOM from Chongming Island, China, the largest alluvial plain island in the world. Our results showed that fifty-eight spermatophytes in riparian wetland were clustered into five vegetation types, including warm coniferous forest (WCF), deciduous broad leaf forest (DBF), evergreen broad leaf forest (EBF), aquatic plants (AP) and herbaceous plants (HP). Absorption spectra revealed the effects of vegetation types on riparian chromophoric WSOM quantity. Although no difference in water-extracted soil organic carbon (WSOC) contents was observed, deciduous broad leaf forest (DBF) and evergreen broad leaf forest (EBF) fed more fluorescent WSOM quantity than did the other vegetation (AP, HP and WCF), and deciduous broad leaf forest (DBF) and aquatic plants (AP) provided more humic-like (RC.1 and RC.2) and fulvic-like (RC.3) substances into riparian wetland (P<0.05 orP<0.01). In addition, we noted that humic-like and protein-like substances (RC.4) transported from riparian wetland into a river water body, and riverine terrestrial-originated components (FC.1 and FC.2) were significantly related to the four riparian fluorescent WSOM components (P<0.05). Furthermore, the riverine trophic state was significantly higher when the fluvial DOM and its component quantity increased (P<0.05). We concluded that riparian wetland can control the quantity and quality of riparian WSOM and reshaped riverine DOM compositions and riverine water quality with important management implications.
机译：河岸湿地通过控制非点源污染和保护水生生态系统在提高水质方面发挥重要作用。在本研究中，我们调查并确定了河岸湿地的植被类型，评估了植被类型如何影响河岸湿地的水分提取土壤有机物（WSOM）的空间格局，并探讨了河岸荧光WSOM对荧光溶解有机物的影响（ FDOM）和河流生态系统中的水营养状态。我们使用吸收和激发-发射矩阵（EEM）荧光光谱来表征来自世界最大冲积平原岛中国崇明岛的河岸WSOM和河流DOM的光学特性。我们的研究结果表明，河岸湿地中的58种种子植物被分为5种植被类型，包括温暖的针叶林（WCF），落叶阔叶林（DBF），常绿阔叶林（EBF），水生植物（AP）和草本植物（生命值）。吸收光谱揭示了植被类型对河岸发色WSOM量的影响。尽管未观察到水分提取的土壤有机碳（WSOC）的差异，但落叶阔叶林（DBF）和常绿阔叶林（EBF）的荧光WSOM量比其他植被（AP，HP和WCF）多，落叶阔叶林（DBF）和水生植物（AP）向河岸湿地提供更多的腐殖质（RC.1和RC.2）和黄腐质（RC.3）物质（P <0.05或P <0.01）。此外，我们注意到，腐殖质和蛋白质样物质（RC.4）从河岸湿地转移到河流水体中，而河流陆源成分（FC.1和FC.2）与这四个因素有显着关系。河岸荧光WSOM成分（P <0.05）。河流DOM及其组分含量增加时，河流营养状态显着升高（P <0.05）。我们得出的结论是，河岸湿地可以控制河岸WSOM的数量和质量，并重塑河道DOM成分和河道水质，具有重要的管理意义。

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