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首页> 外文期刊>The Science of the Total Environment >Effects of polyacrylamide on soil erosion and nutrient losses from substrate material in steep rocky slope stabilization projects
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Effects of polyacrylamide on soil erosion and nutrient losses from substrate material in steep rocky slope stabilization projects

机译：聚丙烯酰胺对陡峭岩质边坡稳定工程中土壤侵蚀和基质物质养分流失的影响

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Erosion of denuded steep rocky slopes causes increasing losses of nitrogen and phosphorus, which is a severe problem in rocky slope protectioa Thus, it is important to determine the appropriate materials that can reduce the erodibility and losses of nitrogen and phosphorus of the soil. In this paper, twenty-seven simulated rainfall events were carried out in a greenhouse, in which the substrate material was artificial soil; nine types of anionic polyacrylamide (PAM) were studied, which consisted of three molecular weight (6, 12, and 18 Mg mol~(-1)) and three charge density (10, 20, and 30%) formulations in a 3 by 3 factorial design. The results showed that: (1) Polyacrylamide application reduced total nitrogen losses by 35.3% to 50.0% and total phosphorus losses by 34.9% to 48.0% relative to the control group. (2) The losses of total nitrogen and total phosphorus had significant correlation with the molecular weight Besides, the losses of total phosphorus, particulate-bound phosphorus and inorganic nitrogen (NH_4-N) were significantly correlated with their molecular weight and charge density. However, the losses of dissolved organic nitrogen, inorganic nitrogen (NO_3-N), dissolved organic phosphorus, inorganic phosphorus (PO_4-P) were non-significantly correlated with molecular weight and charge density. (3) Particulate-bound nitrogen and phosphorus were responsible for the losses of nitrogen and phosphorus during runoff events, where particulate-bound nitrogen made up 71.7% to 73.2% of total nitrogen losses, and particulate-bound phosphorus made up 823% to 85.2% of total phosphorus losses. (4) Polyacrylamide treatments increased water-stable aggregates content by 32.3% to 59.1%, total porosity by 113% to 49.0%, final infiltrative rate by 41.3% to 72.5%, and reduced soil erosion by 18.9% to 39.8% compared with the control group. Overall, the results of this study indicated that polyacrylamide application in the steep rocky slope stabilization projects could significantly reduce nutrient losses and soil erosion of substrate material.
机译：剥蚀的陡峭岩石边坡的侵蚀导致氮和磷的损失增加，这是在岩石边坡保护中的一个严重问题。因此，确定合适的材料以减少土壤的氮素和磷的侵蚀性和损失非常重要。本文在温室中进行了27次模拟降雨事件，其中基质材料是人造土壤。研究了9种类型的阴离子聚丙烯酰胺（PAM），由三种分子量（6、12和18 Mg mol〜（-1））和三种电荷密度（10、20和30％）的配方组成，比例为3 by 3阶乘设计。结果表明：（1）聚丙烯酰胺施用相对于对照组将总氮损失降低了35.3％至50.0％，将总磷损失降低了34.9％至48.0％。 （2）总氮和总磷的损失与分子量有显着的相关性。此外，总磷，结合颗粒的磷和无机氮（NH_4-N）的损失与它们的分子量和电荷密度有显着的相关性。然而，溶解有机氮，无机氮（NO_3-N），溶解有机磷，无机磷（PO_4-P）的损失与分子量和电荷密度无显着相关。 （3）径流事件中，颗粒物结合的氮和磷是氮和磷损失的原因，其中颗粒物结合的氮占总氮损失的71.7％至73.2％，颗粒物结合的磷占823％至85.2。总磷损失的百分比。 （4）聚丙烯酰胺处理使水稳性骨料含量增加了32.3％至59.1％，总孔隙度增加了113％至49.0％，最终渗透率增加了41.3％至72.5％，土壤侵蚀减少了18.9％至39.8％。控制组。总体而言，这项研究的结果表明，在陡峭的岩石边坡稳定工程中使用聚丙烯酰胺可以显着减少基质材料的养分流失和土壤侵蚀。

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