Effects of wetland restoration on nitrate removal in an irrigated agricultural area: The role of in-stream and off-stream wetlands
Effects of wetland restoration on nitrate removal in an irrigated agricultural area: The role of in-stream and off-stream wetlands
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DOI：
10.1016/j.ecoleng.2016.03.016
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发表时间：
2017-06-01
影响因子：
3.8
通讯作者：
Sorando, Ricardo
中科院分区：
文献类型：
--
作者：
Darwiche-Criado, Nadia;Comin, Francisco A.;Sorando, Ricardo
在位于西班牙东北部的密集灌溉农业区弗卢门河流域南部恢复了11个溪流湿地和5个非溪流湿地，以评估其去除硝酸盐的效率和影响其性能的因素。在2011-2014年期间，在一年中的不同时期采集了样本，以评估农业活动在完成后两年内的影响。溪流湿地中硝酸盐浓度明显较高，表现出明显的灌溉返流输入稀释效应。河流湿地和非河流湿地、灌溉季节和非灌溉季节的硝酸盐一级去除速率常数的变化规律不同。在非灌溉季节，溪流湿地出水硝酸盐浓度与一级硝酸盐去除速率常数呈显著负相关(p<；0.01)，说明过高的硝酸盐输入可能会限制湿地的有效性。在非灌溉季节，温度和溶解氧对外滩湿地的硝酸盐去除也有显著影响，但在灌溉期间，只有溶解氧对硝酸盐的去除有促进作用，说明季节因素对硝态氮和湿地动态的影响。研究结果表明，尽管实现最佳湿地开发需要较长的时间，但湿地可以作为有效去除硝酸盐的缓冲区。这项研究强调了农业季节性对湿地硝酸盐去除影响因素的影响，扩展了类似研究提供的信息，并验证了一个适用于广泛农业、水文和季节条件的模型。(C)2016爱思唯尔B.V.保留所有权利。
Eleven in-stream and five off-stream wetlands were restored in the southern portion of the Flumen River basin, an intensively irrigated agricultural area located in NE Spain, to evaluate their efficiency for nitrate removal and to assess the factors affecting their performance. Samples were taken during different periods of the year during 2011-2014 to evaluate the influence of agricultural activities during the two years following their completion. Nitrate concentration was significantly higher in the in-stream wetlands, showing a clear dilution effect caused by the inputs of the irrigation return flows. The patterns followed by the first-order nitrate removal rate constant were different for in-stream and off-stream wetlands and during irrigation and non-irrigation seasons. During non-irrigation seasons, the nitrate outflowing concentration was found to be negatively correlated (p < 0.01) to the first-order nitrate removal rate constant for in-stream wetlands, indicating that high nitrate inputs may restrict the effectiveness of the wetlands. Temperature and dissolved oxygen were also found to significantly influence the performance of off-stream wetlands during non-irrigation seasons, but only dissolved oxygen promoted the nitrate removal during the irrigation period, indicating the influence of the seasonal factor on nitrate and wetlands dynamics. The results of this study showed that although a longer time is required to achieve optimal wetland development, wetlands can be used as buffer zones that effectively remove nitrates. This study emphasizes the influence of the agricultural seasonality of the factors affecting nitrate removal in wetlands, expanding the information provided by similar studies and validating a model that is applicable to a wide range of agricultural, hydrological and seasonal conditions. (C) 2016 Elsevier B.V. All rights reserved.