Dissolved Phosphorus Retention in Buffer Strips: Influence of Slope and Soil Type.
Dissolved Phosphorus Retention in Buffer Strips: Influence of Slope and Soil Type.
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DOI：
10.2134/jeq2014.10.0440
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发表时间：
2015-07
影响因子：
2.4
通讯作者：
T. Darch;Alison Carswell;Martin S. A. Blackwell;Jane M. B. Hawkins;P. Haygarth;D. R. Chadwick
中科院分区：
文献类型：
--
作者：
T. Darch;Alison Carswell;Martin S. A. Blackwell;Jane M. B. Hawkins;P. Haygarth;D. R. Chadwick
磷（P）会导致表层沃茨的富营养化，可以设置缓冲带，以减少磷从农业来源向水道的转移。本研究旨在验证土壤类型和坡度对2 m宽缓冲带土壤中溶解性有机磷和无机磷在农业径流中滞留的影响。由溶解的正磷酸盐和有机磷化合物葡萄糖-1-磷酸盐、RNA和肌醇六磷酸盐（1.8 mg/L总磷）和氯化物示踪剂组成的溶液作为模拟坡面流施加到含有完整粘土或壤土的草地土壤块（2 m长× 0.5 m宽× 0.35 m深）中，坡度为2 °、5 °和10°。磷的形式，确定在表面和地下流从土壤块。坡度没有显着影响土壤块的水文行为或任何形式的P的保留在水的应用率测试。粘土保留了60%的非活性磷和21%的活性磷。壤土保留了74%的非活性磷，但活性磷的净来源（负荷增加了61%）。这表明原生土壤P的淋溶或有机化合物的水解，使我们对缓冲带土壤中P保留的理解变得复杂。我们的研究结果表明，一个2米的缓冲带可能是更有效地减少溶解的非反应性磷转移到表面沃茨比减少富营养化的风险所造成的溶解活性磷。
Phosphorus (P) contributes to eutrophication of surface waters and buffer strips may be implemented to reduce its transfer from agricultural sources to watercourses. This study was conducted to test the hypothesis that soil type and slope influence the retention of dissolved organic P and inorganic orthophosphate in agricultural runoff in 2-m-wide buffer strip soils. A solution, comprised of dissolved orthophosphate and the organic P compounds glucose-1-phosphate, RNA, and inositol hexakisphosphate (1.8 mg L total P) and a chloride tracer, was applied as simulated overland flow to grassland soil blocks (2 m long × 0.5 m wide × 0.35 m deep), containing intact clay or loam soils, at slope angles of 2, 5, and 10°. Phosphorus forms were determined in the surface and subsurface flow from the soil blocks. Slope had no significant effect on the hydrological behavior of the soil blocks or on the retention of any form of P at the water application rate tested. The clay soil retained 60% of the unreactive P and 21% of the reactive P applied. The loam soil retained 74% of the unreactive P applied but was a net source of reactive P (the load increased by 61%). This indicates leaching of native soil P or hydrolysis of organic compounds and complicates our understanding of P retention in buffer strip soils. Our results suggest that a 2-m buffer strip may be more effective for reducing dissolved unreactive P transfers to surface waters than for reducing the eutrophication risk posed by dissolved reactive P.