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首页> 外文会议>Seventh International Conference on Modelling, Measuring and Prediction of Water Pollution null Cadiz >Temporal variation of nitrogen and phosphorus contents in surface waters from a small agricultural catchment in NW Spain
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Temporal variation of nitrogen and phosphorus contents in surface waters from a small agricultural catchment in NW Spain

机译：西班牙西北部一个小型农业流域地表水中氮磷含量的时空变化

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This work examines the influence of various factors, such as climatic (precipitation level and flux rate) and antropogenic (soil use and management practices), on the evolution of NO_3, NO_2 NH_4 and PO_4~(3-)"-P concentrations in the surface water of a small agricultural catchment. NH_4~+ and PO_4~(3-) concentrations were strongly influenced by the arrival of slurries to the stream. The suspension of these fertilization practices that came with the soil use changes lead to a decrease of several orders of magnitude in their concentrations. So, NH_4~+ levels, after reaching peaks of 30 mg L~(-1) during high intensity fertilization periods, went on to be in the range 0.03 to 0.2 mg L~(-1) when slurry application was stopped, and PO_4~(3-)-P concentrations reached values of 10 mg L~-and after changes in soil use showed levels above 0.3 mg L`(-1). Levels of NO_3~- and NO_2~- seemed to follow a different pattern. Because these compounds originate from slurry applications, they are not found in these wastes at the beginning but are created as products of a nitrification process. NO_3`- levels present variations ranging between 10 and 50 mg L~(-1) but do not undergo a strong decrease after the soil use change (six months after a change in soil use several samples reached concentrations around 60 mg L~(-1). In general, evaluation of the ions studied shows a low relation between ion concentrations and flux rate. Correlation coefficients calculated from NO_3~- data give a lower value for samples collected during the period of higher intake of slurry in the stream than when slurry addition was lower.
机译：这项工作研究了各种因素，如气候（降水水平和通量率）和致厌性（土壤使用和管理实践）对土壤中NO_3，NO_2 NH_4和PO_4〜（3-）“-P浓度变化的影响。小型农业流域的地表水，NH_4〜+和PO_4〜（3-）的浓度受到泥浆流向河流的强烈影响，这些随土壤使用变化而发生的施肥措施的中止导致土壤中的几种减少因此，在高强度施肥期间，NH_4〜+水平在达到30 mg L〜（-1）的峰值后，在0.03至0.2 mg L〜（-1）的范围内。停止施用泥浆，PO_4〜（3-）-P的浓度达到10 mg L〜-的值，并且在土壤利用变化后，其含量超过0.3 mg L`（-1），NO_3〜-和NO_2〜-的含量似乎遵循不同的模式，因为这些化合物源自浆液应用，因此未发现它们这些废物在一开始就被排放掉了，但却是硝化过程的产物。 NO_3`-的含量变化范围在10至50 mg L〜（-1）之间，但在土壤用途改变后（土壤用途改变后六个月，一些样品的浓度达到60 mg L〜（- 1）。通常，对所研究离子的评估表明离子浓度与通量率之间的关系很低，从NO_3〜-数据计算得出的相关系数给出的值比在流中进料量更高时收集的样品的值低。浆料添加量较低。

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