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首页> 外文期刊>Research Journal of Fisheries and Hydrobiology >Water and nutrient transfers from a SW Mediterranean stream (Kebir West, Algeria) submitted to reservoir retention
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Water and nutrient transfers from a SW Mediterranean stream (Kebir West, Algeria) submitted to reservoir retention

机译：来自西南地中海（阿尔及利亚基比尔）的溪流中的水和养分转移已提交水库保留

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Kebir west catchment occupied 1,900 km2 including Zit Amba reservoir that retain annually over 120 million m3. The catchment is weakly populated with only 30 people/km2, where the agricultural practices are still to subsistence need. Water samples were taken two times a month at the entrance and the exit of the reservoir, and the stream mouth during April 2012-April 2013 along. The aim of this study is to (a) the distribution of silicon (as well as nitrogen and phosphorus) in the catchment area under study, as a result of geochemical transfers at the river/sea interface, (b) to determine the effect of the dam on the retention of and nutrient salts and (c) to evaluate the fluxes of water and nutrient salts into the sea during the study period. The Kebir West reservoir delivered to the sea about 386 m3/yr of water. From the inorganic nutrient incoming fluxes, the reservoir trapped annually 62% to 60% of DIN and DIP respectively and 56% of SiO4. The mouth of the Kebir west stream delivered 274t/yr of total dissolved nitrogen in which the dissolved inorganic form represented 68%. Flux of total dissolved phosphorus reached 100t/yr with a great organic fraction (60%), while the amount of the dissolved silicon attained 923t/yr. Si:N molar ratio is still balanced (2.5-2.8) over the entire catchment, in contrast to N:P ratio deviated (9-11.40) from the Redfield standard ratio, indicating the prevalence of P over N. The dominance of P over N will have effects on the receiving coastal waters. The study concludes that the major characteristics of the water stream, under study, are marked by strong enrichment, in particular in NH4 and PO4, and retention of SiO4 in the reservoir. The delivered waters from the reservoir have high contents of dissolved organic matter. This implies that these artificial impoundments would play a crucial role in nutrient biogeochemical cycling.
机译：Kebir西部流域占地1,900平方公里，包括Zit Amba水库，每年保留超过1.2亿立方米。流域人口稀少，每平方公里只有30人，那里的农业实践仍然满足生活需要。每月两次在水库的入口和出口抽取水样，并在2012年4月至2013年4月期间抽取溪流口。这项研究的目的是（a）由于河流/海界面的地球化学转移，在研究的集水区中硅（以及氮和磷）的分布;（b）确定（b）评估研究期间水和营养盐向海中的通量。凯比尔西部水库每年向海输送约386立方米水。从无机养分流入通量来看，储层每年分别捕获了62％至60％的DIN和DIP和56％的SiO4。凯比尔西流口输送的总溶解氮为274吨/年，其中溶解的无机形式占68％。总溶解磷的通量达到100t / yr，其中有机物含量很高（60％），而溶解硅的量达到923t / yr。 Si：N摩尔比在整个流域仍保持平衡（2.5-2.8），而N：P比率偏离Redfield标准比率（9-11.40），表明P在N之上的普遍性。氮将对接收沿海水域产生影响。研究得出的结论是，所研究的水流的主要特征是强烈富集，尤其是NH4和PO4的富集，以及SiO4在储层中的保留。从储层中输送的水具有高含量的溶解有机物。这意味着这些人工蓄水将在营养生物地球化学循环中发挥关键作用。

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