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首页> 外文期刊>Aquatic Sciences >Variations in the δ~(15)N and δ~(18)O values of nitrate in drainage water of two fertilized fields in Mecklenburg-Vorpommern (Germany)
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Variations in the δ~(15)N and δ~(18)O values of nitrate in drainage water of two fertilized fields in Mecklenburg-Vorpommern (Germany)

机译：梅克伦堡-前波美拉尼亚（德国）两个施肥田排水中硝酸盐的δ〜（15）N和δ〜（18）O值变化

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摘要

Over a period of 17 months, variations in δ~(15)N and δ~(18)O values in drainage water nitrate from two collector-drain outlets were investigated. Both fields were conventionally farmed. One field was 2.5 ha (outlet 1) and the other 15 ha (outlet 2) in size; each received similar N amounts per hectare during fertilizer application. In tile drain 1, the δ~(15)N-NO_3 values (concentration weighted mean (cwm) 10.6 per thousand) and δ~(18)O-NO_3 values (cwm 5.1 per thousand) were higher compared to the second tile drain (cwm δ~(15)N: 7.2 per thousand; cwm δ~(18)O: 2.9 per thousand). Changes in isotope values of drainage water nitrate could be observed in tile drain 1 after fertilizer application. These changes included an increase in δ~(15)N-NO_3 after fertilization with urea and a decrease in δ~(15)N-NO_3 values associated with increased δ~(18)O-NO_3 values when nitrate fertilizer was applied. Low δ~(18)O values in drainage water nitrate of both tiles indicate that nitrification took place for most of the sampling period. Denitrification was only observed in water of tile 2 for a period of six months during summer and autumn.
机译：在17个月的时间里，研究了两个集水器-排水口的硝酸盐排放中δ〜（15）N和δ〜（18）O值的变化。这两个领域都是常规耕种的。一个田地面积为2.5公顷（出口1），其他面积为15公顷（出口2）；在施用肥料的过程中，每公顷均获得相似的N量。与第二个瓷砖排水沟相比，瓷砖排水沟1的δ〜（15）N-NO_3值（浓度加权平均（cwm）为10.6 /千）和δ〜（18）O-NO_3数值（cwm 5.1 /千分之一） （cwmδ〜（15）N：7.2 /千； cwmδ〜（18）O：2.9 /千）。施肥后，瓷砖排水管1的排水硝酸盐同位素值发生了变化。这些变化包括尿素施肥后δ〜（15）N-NO_3的增加和与硝酸盐肥料施用时δ〜（18）O-NO_3值的增加相关的δ〜（15）N-NO_3值的减少。两种瓷砖的排水硝酸盐中的δ〜（18）O值均较低，表明在大部分采样期间都发生了硝化作用。在夏季和秋季，仅在瓷砖2的水中观察到反硝化作用六个月。

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