Four streams in the Guadiana watershed were followed up to assess hydrogeomorphological and physicochemical characteristics, and to analyze its correlation with land use/land cover (LULC), analyzing their possible influence in reservoir water quality and possible influence in the reservoir water quality. The highest amounts of organic descriptors and nutrients were quantified in streams with the major percentage of olive groves and vineyards and urban land cover classes. Streams more influenced by agro-silvo-pastoral class presented better water quality, as this type of LULC acts as a buffer of the contamination runoff. The results highlighted that the hydrogeomorphology of the streams may influence the transfer of pollutants loads to reservoirs. Hence, in intermittent streams characterized by coarse particles in the sediment, high amounts of pollutants are accumulated when the flow ceases, and are further transported to the reservoirs when the flow retakes. On the contrary, streams with sediments characterized by a great percentage of fine particles and organic matter do not induce so much stress in reservoirs, since these allow the adsorption of nutrients and trace elements, without their transfer to reservoirs.

中文翻译：

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支流的土地覆盖模式和水文地貌：这些是地中海地区水库水质的重要压力因素吗？

对瓜迪亚纳流域的 4 条河流进行跟踪，评估水文地貌和物理化学特征，并分析其与土地利用/土地覆盖 (LULC) 的相关性，分析它们对水库水质的可能影响和对水库水质的可能影响。在橄榄树林和葡萄园以及城市土地覆盖类别的主要百分比的溪流中量化了最高数量的有机描述符和营养物质。受农林牧区影响较大的河流水质较好，因为这种类型的 LULC 充当污染径流的缓冲区。结果强调，河流的水文地貌可能会影响污染物负荷向水库的转移。因此，在以沉积物中粗颗粒为特征的间歇性溪流中，当水流停止时，大量污染物会积聚，并在水流重新开始时进一步输送到水库。相反，含有大量细颗粒和有机物的沉积物的河流不会在水库中引起如此大的压力，因为这些允许营养物和微量元素的吸附，而不会将它们转移到水库中。