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首页> 外文期刊>Ecosystems >Stream Nitrate Responds Rapidly to Decreasing Nitrate Deposition
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Stream Nitrate Responds Rapidly to Decreasing Nitrate Deposition

机译：流式硝酸盐快速响应以减少硝酸盐沉积

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Ecosystem acidification and eutrophication resulting from increased deposition of dissolved inorganic nitrogen (DIN) are issues of increasing global concern. Consequently, costly policy decisions are being implemented to decrease nitrogen oxide (NO sub( )x emissions. Although declining DIN deposition along with rapid declines of DIN in surface waters have been reported in parts of Europe, the same observation is just emerging in North America. Here we find a significant decline in bulk deposition NO sub(3) super(-) during the later part of a 28-year record in southcentral Ontario, Canada. Despite high N retention and substantial inter-annual variability in the long-term record due to periods of drought, we find significant declines in annual NO sub(3) super(-) concentrations and export at six out of 11 streams that drain upland-dominated catchments. In contrast, five streams draining primarily wetland-dominated catchments with lower levels of NO sub(3) super(-) show no decreasing trend in NO sub(3) super(-) concentration or export. The rapid response in stream NO sub(3) super(-) to declining atmospheric inputs was observed at sites with historically moderate inputs of DIN (~870mgm super(-2) y super(-1)) in bulk deposition. Topographic features such as slope, and related catchment features including wetland cover, appear to influence which catchments will respond positively to declining DIN deposition. These findings force us to revise our original conceptualization of the N saturation status of these catchments.
机译：由溶解的无机氮（DIN）沉积增加引起的生态系统酸化和富营养化是全球关注的问题。因此，为减少氮氧化物（NO sub（）x的排放量）实施了昂贵的政策决策，尽管欧洲部分地区已经报道了DIN沉积量下降以及地表水中DIN的快速下降，但是在北美也出现了同样的现象。在这里，我们发现在加拿大安大略省中南部28年记录的后期，大量沉积的NO sub（3）super（-）出现了显着下降，尽管长期以来氮保留率很高且年际变化很大。根据干旱时期的记录，我们发现年排放NO sub（3）super（-）的浓度显着下降，并且在11条排放高地支配集水区的溪流中有6条出口。 NO sub（3）super（-）的水平较低显示NO sub（3）super（-）浓度或出口量没有下降趋势，观察到NOsub（3）super（-）物流对大气输入量的快速响应在他的网站本体沉积中DIN的扭矩适度输入（〜870mgm super（-2）y super（-1））。地形特征（例如坡度）和相关的集水区特征（包括湿地覆盖）似乎会影响哪些集水区将对下降的DIN沉积产生积极的响应。这些发现迫使我们修改这些流域氮饱和状态的原始概念。

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