Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-06-17 , DOI: 10.1016/j.scitotenv.2020.140268
Mathieu Nsenga Kumwimba 1 , Bo Zhu 2 , Tao Wang 2 , Mawuli Dzakpasu 3 , Xuyong Li 4
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Vegetated agricultural drainage ditches (VDs) are a relatively new best management practice for pesticide and nutrient mitigation that is receiving increasing global interest. However, VDs are seldom used during winter due to considerable deterioration of pollutants reduction efficiencies driven by low-temperature effects. Limited knowledge on the internal loading of nutrient in VDs due to vegetation decomposition calls for further evaluation. Here, we assessed plants growth characteristics and nutrient dynamics in a field-scale VD receiving nutrient-rich sewage and planted with the overwintering plants: Acorus gramineus, Myriophyllum aquaticum and Iris sibirica. Water purification performance showed average TN, NH4-N, NO3-N, TP and PO4-P reduction efficiencies of 44, 46, 43, 52 and 46%, respectively, over the winter period. Maximum reduction rates of TN and TP were 5.31 and 0.34 g−2 d−1, respectively. Of the total nutrient removal by plants of 5.37 × 103 kg N y−1 and 0.65 × 103 kg P y−1 from the VD system, A. gramineus contributed 65.7% and 72.1%, respectively. Nonetheless, substantial amounts of N and P retained within the aboveground biomass were released into the water column as ditch plant shoots decayed to deteriorate the water quality. All three species, A. gramineus, M. aquaticum and I. sibirica demonstrated considerable nutrient accumulation during winter and facilitated nutrient retention in the VD system. Consequently, they can be considered effective overwintering species of choice in VDs for purifying nutrient-rich water and potentially appropriate for vulgarizing elsewhere, particularly throughout the winter season.
中文翻译:
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植被排泄沟中的养分动态和滞留在低温下接收富含营养的污水。
植被农业排水沟(VDs)是一种相对较新的农药和养分减缓最佳管理方法,正在引起全球越来越多的关注。但是,由于低温效应驱动的污染物减少效率大大降低,因此在冬季很少使用VD。由于植被分解,对VD中营养物质内部负荷的了解有限,需要进一步评估。在这里,我们评估了田间规模的VD的植物生长特性和养分动态,该VD接受了富含养分的污水,并种植了越冬植物:禾本科草(Acorus gramineus),桃金娘(Myriophyllum aquaticum)和鸢尾(Iris sibirica)。水净化性能显示平均TN,NH 4 -N,NO在冬季,3- N,TP和PO 4 -P的还原效率分别为44、46、43、52和46%。TN和TP的最大还原率分别为5.31和0.34 g -2 d -1。的总营养物去除由植物5.37×10的3 公斤氮ÿ -1和0.65×10 3 公斤Pý -1从VD系统,甲。禾本科分别贡献了65.7%和72.1%。然而,由于沟渠植物新芽腐烂而恶化了水质,地上生物量中保留的大量N和P被释放到水柱中。所有这三种,A。石菖蒲,中号。水生动物和我。西伯利亚桦在冬季表现出大量的养分积累,并促进了VD系统中的养分保留。因此,可以认为它们是VD中选择的有效越冬物种,用于净化富含营养的水,并且可能适合在其他地方进行硫化,尤其是在整个冬季。