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Best management practices scenario analysis to reduce agricultural nitrogen loads and sediment yield to the semiarid Mar Menor coastal lagoon (Spain)
Agricultural Systems ( IF 6.1 ) Pub Date : 2020-12-24 , DOI: 10.1016/j.agsy.2020.103029
Cristina Puertes , Inmaculada Bautista , Antonio Lidón , Félix Francés

Agriculture is a major source of diffuse pollution, where nitrogen and sediment pollution of water bodies are its main associated environmental impacts. Best management practices are effective tools for preventing and minimizing water pollution. Water quality models and model-based scenario analyses are useful tools for assessing impacts of best management practices and to identify appropriate strategies on the watershed scale. This study was conducted in the southernmost Mar Menor basin, one of the largest saltwater coastal lagoons in Europe and threatened by diffuse nutrient and sediment export from the agricultural landscape. This study evaluates the impact of several management practices on nitrogen and sediment loads, and horticultural crop yield, to identify an appropriate management strategy on the watershed scale. Both structural and nonstructural management practices scenarios were evaluated: three scenarios representing field operations, two coastal line buffers, a new fertilizer management strategy and a change in the productive cultivation system from three-crop rotation to two-crop rotation. Each management practice reduced a certain type of diffuse pollution and, therefore, a combined set of changed management practices is necessary to cope with all agricultural pollution types. Contour farming, combined with hedgerow field borders, was effective in sediment yield and surface organic nitrogen export reduction terms, while improved fertilizer management reduced surface nitrate export and leaching with minimal impacts on crop yields.



中文翻译:

最佳管理实践方案分析,以减少半干旱Mar Menor沿海泻湖(西班牙)的农业氮负荷和沉积物产量

农业是弥漫性污染的主要来源,其中水体的氮和沉积物污染是其主要的相关环境影响。最佳管理实践是预防和减少水污染的有效工具。水质模型和基于模型的情景分析是评估最佳管理实践的影响并在流域尺度上确定适当策略的有用工具。这项研究是在最南端的Mar Menor盆地进行的,该盆地是欧洲最大的咸水沿海泻湖之一,受到农业景观中养分和沉积物扩散的威胁。这项研究评估了几种管理措施对氮素和沉积物负荷以及园艺作物产量的影响,以确定在分水岭规模上合适的管理策略。评估了结构性和非结构性管理实践方案:代表现场作业的三个方案,两个沿海生产线缓冲区,新的肥料管理策略以及生产性耕作制度从三作轮作改为两作轮作。每种管理实践都减少了某种类型的扩散污染,因此,有必要对变更后的管理实践进行组合以应对所有农业污染类型。轮廓耕作与篱笆篱笆的边界相结合,在减少泥沙产量和减少地表有机氮的出口方面非常有效,而改良肥料的管理减少了地表硝酸盐的出口和浸出,对作物产量的影响最小。两个沿海生产线缓冲区,新的化肥管理策略以及生产性耕作制度从三作轮换改为两作轮换。每种管理实践都减少了某种类型的扩散污染,因此,有必要对变更后的管理实践进行组合以应对所有农业污染类型。轮廓耕作与篱笆篱笆边界相结合,在减少泥沙产量和减少地表有机氮出口方面非常有效,而改良肥料管理减少了地表硝酸盐出口和浸出,对作物产量的影响最小。两个沿海生产线缓冲区,新的化肥管理策略以及生产性耕作制度从三作轮换改为两作轮换。每种管理实践都减少了某种类型的扩散污染,因此,有必要对变更后的管理实践进行组合以应对所有农业污染类型。轮廓耕作与篱笆篱笆的边界相结合,在减少泥沙产量和减少地表有机氮的出口方面非常有效,而改良肥料的管理减少了地表硝酸盐的出口和浸出,对作物产量的影响最小。为了应对所有农业污染类型,必须结合一套变更的管理实践。轮廓耕作与篱笆篱笆边界相结合,在减少泥沙产量和减少地表有机氮出口方面非常有效,而改良肥料管理减少了地表硝酸盐出口和浸出,对作物产量的影响最小。为了应对所有农业污染类型,必须结合一套变更的管理实践。轮廓耕作与篱笆篱笆边界相结合,在减少泥沙产量和减少地表有机氮出口方面非常有效,而改良肥料管理减少了地表硝酸盐出口和浸出,对作物产量的影响最小。

更新日期:2020-12-24
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