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首页> 外文期刊>Sustainable Water Resources Management >Significance of wetlands for sediment and nutrient reduction in Lake Tana Sub-Basin, Upper Blue Nile Basin, Ethiopia
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Significance of wetlands for sediment and nutrient reduction in Lake Tana Sub-Basin, Upper Blue Nile Basin, Ethiopia

机译：埃塞俄比亚上尼罗河上游塔纳湖次流域湿地对减少沉积物和减少养分的意义

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摘要

Sedimentation from agricultural fields and seasonal eutrophication from non-point source inorganic nutrients (N, P and OM) on the lakes and reservoirs are the main problems in the Tana sub-basin, Ethiopia. The objective of this study was to quantify the amount of suspended sediment concentration and sediment fixed nutrients in the wetland. Two wetlands were selected purposefully to quantify how much sediment and nutrient trapped by the wetlands and 26 runoff events were sampled for each wetland at inlet and outlet points. All runoff samples were filtered by a filter paper and measured after air dried using sensitive balance to determine sediment amount in g/L. Only 10 representative samples were subjected to nutrient analysis in the laboratory. Averagely, 7 g/L (86%) and 3 g/L (80%) suspended sediment was absorbed by wetlands in site 2 and site 1 respectively. Regarding to nutrient loss, 53, 50 and 49% nitrogen, phosphorus and organic matter (OM) was absorbed by wetland in site 2 respectively. Whereas, it was 33, 29 and 31% in site 1. Thus, wetlands have crucial role to catch suspended sediment load and associated nutrients entering into downstream reservoirs and lakes.
机译：埃塞俄比亚塔纳盆地的主要问题是农田沉淀和湖泊和水库面源性无机养分（N，P和OM）的季节性富营养化。这项研究的目的是量化湿地中悬浮的泥沙浓度和泥沙固定养分的数量。有目的地选择了两个湿地，以量化湿地捕获的沉积物和养分的数量，并为每个湿地在入口和出口点采样了26个径流事件。所有径流样品均用滤纸过滤，风干后用灵敏天平测量，以克/升为单位确定沉淀物量。在实验室中仅对10个代表性样品进行了营养成分分析。平均而言，站点2和站点1的湿地分别吸收7 g / L（86％）和3 g / L（80％）的悬浮沉积物。关于养分流失，站点2的湿地分别吸收了53％，50％和49％的氮，磷和有机质（OM）。而在站点1中分别为33％，29％和31％。因此，湿地对于捕捉悬浮的泥沙负荷和相关营养进入下游水库和湖泊至关重要。

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