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首页> 外文期刊>The Science of the Total Environment >Rainfall intensity and phosphorus source effects on phosphorus transport in surface runoff from soil trays
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Rainfall intensity and phosphorus source effects on phosphorus transport in surface runoff from soil trays

机译：降雨强度和磷源对土壤盘表面径流中磷迁移的影响

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Phosphorus runoff from agricultural fields amended with mineral fertilizers and manures has been linked to freshwater eutrophication. A rainfall simulation study was conducted to evaluate the effects of different rainfall intensities and P sources differing in water soluble P (WSP) concentration on P transport in runoff from soil trays packed with a Berks loam and grassed with annual ryegrass (Lolium multiflorum Lam.). Triple superphosphate (TSP; 79% WSP), low-grade super single phosphate (LGSSP; 50% WSP), North Carolina rock phosphate (NCRP; 0.5% WSP) and swine manure (SM; 70% WSP), were broadcast (100 kg total P ha~(-1)) and rainfall applied at 25, 50 and 75 mm h~(-1) 1, 7, 21, and 56 days after P source application. The concentration of dissolved reactive (DRP), particulate (PP), and total P (TP) was significantly (P<0.01) greater in runoff with a rainfall intensity of 75 than 25 mm h~(-1) for all P sources. Further, runoff DRP increased as P source WSP increased, with runoff from a 50 mm h~(-1) rain 1 day after source application having a DRP concentration of 0.25 mg L~(-1) for NCRP and 28.21 mg L~(-1) for TSP. In contrast, the proportion of runoff TP as PP was greater with low (39% PP for NCRP) than high WSP sources (4% PP for TSP) averaged for all rainfall intensities. The increased PP transport is attributed to the detachment and transport of undissolved P source particles during runoff. These results show that P source water solubility and rainfall intensity can influence P transport in runoff, which is important in evaluating the long-term risks of P source application on P transport in surface runoff.
机译：来自农田的磷径流经矿物肥料和肥料修正后与淡水富营养化有关。进行了降雨模拟研究，以评估不同降雨强度和不同水溶性磷（WSP）浓度的磷源对装有伯克沃壤土和一年生黑麦草（多年生黑麦草）的土壤盘径流中磷迁移的影响。 。广播了三重过磷酸钙（TSP; 79％WSP），低级超级单磷酸酯（LGSSP; 50％WSP），北卡罗莱纳州磷矿（NCRP; 0.5％WSP）和猪粪（SM; 70％WSP）（100）施用磷源后第1、7、21和56天分别在25、50和75 mm h〜（-1）kg总P ha〜（-1））和降雨。对于所有P源，在降雨强度为75时，径流中的溶解性反应物（DRP），颗粒物（PP）和总磷（TP）的浓度均显着（P <0.01），高于25 mm h〜（-1）。此外，径流DRP随P源WSP的增加而增加，源源施用后1天50 mm h〜（-1）雨水径流，NCRP的DRP浓度为0.25 mg L〜（-1），DRP浓度为28.21 mg L〜（ -1）用于TSP。相比之下，在所有降雨强度下，径流TP作为PP的比例在低（NCRP为39％PP）时要比高WSP来源（TSP为4％PP）高。 PP运移的增加归因于径流过程中未溶解的P源粒子的分离和运移。这些结果表明，磷源的水溶性和降雨强度会影响径流中的磷迁移，这对于评估磷源在地表径流中施用磷的长期风险非常重要。

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