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首页> 外文学位 >Effective suspended sediment and soluble nutrient load mitigation in irrigated agricultural return flows through the use of vegetative filter strips.
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Effective suspended sediment and soluble nutrient load mitigation in irrigated agricultural return flows through the use of vegetative filter strips.

机译：通过使用营养性滤纸条，可有效减轻灌溉农业回流中的悬浮泥沙和可溶性营养素负荷。

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摘要

The use of vegetative filter strips (VFSs) in the mitigation of suspended sediment and soluble nutrient loads from agriculturally derived overland flows is a widespread practice. VFSs have been used in a wide variety of situations to treat runoff from croplands, feed lots, dairy operations, confined animal feeding operations, and roadsides, among other locations. While vegetative matter must regularly be removed from vegetative filter strips in an effort to prevent them from becoming nutrient load sources, very limited attempts have been made (with the exception of biofuel harvesting) to harvest that biomass for a useable purpose.;This dissertation examines the novel approach of establishing vegetative filter strips on the ends of surface-irrigated, row-cropped fields with commonly utilized forage species for the direct mitigation of suspended sediment and soluble nutrient loads in overland flow while concurrently producing a marketable forage crop. A review of the pertinent literature is provided followed by a detailed overview of the experimental setup. Five commonly utilized forage crops were used to establish vegetative filter strips of varying lengths on the ends of furrow-irrigated, row-cropped fields in an arid environment. Vegetative filter strips of 3.05 (10 ft), 6.07 m (20 ft), and 9.14 m (30 ft) in width were found to have removal efficiencies exceeding 99% for: total inflow volume, total suspended solids, NO3-N, NH4-H, PO4-P and total P while yielding marketable forage biomass at a rates roughly comparable to average yields from regional hay farms.;Statistical analyses on mean removal efficiencies showed a significant statistical difference among the performance of VFS width and vegetation cover type for mean suspended sediment removal efficiencies, and among vegetation cover type for NH4-N mean removal efficiencies. No significant statistical difference was shown among either vegetation cover types or VFS width for mean removal efficiencies of NO3-N, PO4-P or total P. NH4-N removal among differing VFS lengths was shown not to be statistically different.
机译：在减轻农业生产的陆上水流中的悬浮沉积物和可溶性营养物负荷方面，使用植物滤料条（VFS）是一种广泛的实践。 VFS已在多种情况下用于处理农田，饲料场，奶牛场，密闭动物饲养场和路边等地方的径流。虽然必须定期从营养滤纸条上去除营养物质，以防止它们成为养分负荷的来源，但为获得有用的生物碱进行了非常有限的尝试（生物燃料收集除外）。一种新颖的方法，可以在表面灌溉的行作作物田的末端建立具有植物滤料条的新方法，该作物滤料具有常用的牧草种类，用于直接缓解陆上水流中的悬浮沉积物和可溶性营养物，同时生产可销售的牧草作物。提供了有关文献的综述，随后是实验装置的详细概述。在干旱的环境中，使用五种常用的草料作物在沟灌，行耕田的末端建立长度不同的营养滤带。发现宽度为3.05（10 ft），6.07 m（20 ft）和9.14 m（30 ft）的植物性滤纸对以下物质的去除效率超过99％：总进水量，总悬浮固体，NO3-N，NH4 -H，PO4-P和总磷，同时产生可出售的牧草生物量，其速率与区域干草场的平均产量大致相当。;对平均去除效率的统计分析表明，VFS宽度和植被覆盖类型的性能之间存在显着的统计差异。平均悬浮物去除效率，以及植被覆盖类型中NH4-N的平均去除效率。在植被覆盖类型或VFS宽度之间，NO3-N，PO4-P或总磷的平均去除效率均无显着统计学差异。不同VFS长度之间的NH4-N去除率无统计学差异。

著录项

  • 作者

    Bodah, Brian William.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Engineering Agricultural.;Environmental Management.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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