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首页> 外文期刊>Regional Environmental Change >Nitrogen cycling in a hypothetical scenario of generalised organic agriculture in the Seine, Somme and Scheldt watersheds
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Nitrogen cycling in a hypothetical scenario of generalised organic agriculture in the Seine, Somme and Scheldt watersheds

机译：塞纳河，索姆河和谢尔德流域普遍有机农业的假设情景中的氮循环

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摘要

Nitrogen contamination of ground and surface water in the Seine, Somme and Scheldt watersheds, as well as in the receiving coastal marine zones, results in severe ecological problems. Previous modelling results showed that the implementation of classical management measures involving improvement of wastewater purification and "good agricultural practices" are not sufficient to obviate these problems. A more radical scenario was therefore established, consisting of a generalised shift to organic agriculture of all agricultural areas in the three basins, with the additional constraints that livestock is fed only on local fodder production. This scenario involves an increased livestock density in the Seine and Somme and a decrease in livestock in the Scheldt basin. It leads to a significant reduction of agricultural production that finally brings the three basins closer to autotrophy/heterotrophy equilibrium. Nitrate concentrations in most of the drainage network would drop below the threshold of 2.25 mgN/1 in the most optimistic hypothesis. The excess of nitrogen over silica (with respect to the requirements of marine diatoms) delivered into the coastal zones would be decreased by a factor from 2 to 5, thus strongly reducing, but not entirely eliminating the potential for marine eutrophication.
机译：塞纳河，索姆河和谢尔德河流域以及接收沿海海域的地下水和地表水的氮污染，导致严重的生态问题。先前的建模结果表明，实施涉及改善废水净化和“良好农业规范”的经典管理措施不足以消除这些问题。因此，建立了一个更为激进的设想，包括三个流域所有农业地区普遍转向有机农业，另外还有其他限制，即只能依靠当地饲料生产来饲养牲畜。这种情况涉及塞纳河和索姆河的牲畜密度增加，而谢尔德盆地的牲畜数量减少。这导致农业生产的显着减少，最终使三个流域更接近自养/异养平衡。在最乐观的假设中，大多数排水网络中的硝酸盐浓度将降至2.25 mgN / 1以下。输送到沿海地区的氮比硅石过量（相对于海洋硅藻的需求而言）将减少2到5倍，从而大大减少，但不能完全消除海洋富营养化的潜力。

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