利用天然游泳池实验比较植被和基质在去除营养物质和建立生物量方面的性能

IF 1 4区 农林科学 Q3 HORTICULTURE
Margaret C. Hoffman, R. Berghage, Hong Wu
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引用次数: 0

摘要

天然游泳池(NSPs)依靠沼泽植被、细菌和基质的相互作用来维持水质。NSPs中的氮(N)和磷(P)水平至关重要,因为它们参与了富营养化。我们进行了一项为期15周的温室研究,以解决关于NSPs低营养环境下基质和植被去除营养物质能力的重大文献空白。采用质量平衡分析方法,比较了四种基质(对照)、再生玻璃、膨胀粘土、膨胀页岩)和两种植物(蓝旗鸢尾(iris versicolor)和蜥蜴尾(Saururus cernuus)在自由水面和地下两种流动条件下的性能。实验结束时,除再生玻璃组外,所有其他基片组将水中硝酸盐(NO3)水平降至低于2011年Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau (FLL)指南的标准30 mg⋅L−1。只有膨胀粘土组接近P标准(≤0.01 mg·L−1)。膨胀粘土和膨胀页岩被证明有潜力作为NSP沼泽的基质。最终地上生物量干重与最终NO3和P水浓度呈极显著负相关。然而,植物的直接吸收不足以去除所有的养分输入,尤其是磷,除了回收玻璃组(34%)外,总氮中很大一部分(79%-90%)是由地上生物量去除的。然而,生物量对磷的吸收明显较低(18%-37%)。蓝旗鸢尾花具有良好的活力和生物量积累,可能是植被NSPs的适宜物种,而蜥蜴尾巴由于不确定的建立而不适合。与控制氮素相比,管理氮素对NSPs的FLL标准更具挑战性。我们的工作开始填补NSP文献中关于基质和植被的营养去除能力的基本空白。未来的工作应继续研究除磷的替代基质和植物物种,特别是在田间条件下和较长时间内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparing Vegetation and Substrate Performances on Nutrient Removal and Biomass Establishment Using a Natural Swimming Pool Experiment
Natural swimming pools (NSPs) rely on the interaction of bog vegetation, bacteria, and substrate to maintain water quality. Nitrogen (N) and phosphorus (P) levels in NSPs are critical because of their involvement in eutrophication. We conducted a 15-week greenhouse study to address the significant literature gap regarding nutrient removal capabilities of substrates and vegetation in the low-nutrient environment of NSPs. We used mass balance analyses to compare the performances of four substrates [river gravel (control), recycled glass, expanded clay, expanded shale] and two plant species [blue flag iris (Iris versicolor) and lizard’s tail (Saururus cernuus)] under two flow conditions: free water surface and subsurface flow. At the end of the experiment, except for the recycled glass group, all other substrate groups reduced water nitrate (NO3) levels to less than 30 mg⋅L−1, the standard of the 2011 Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau (FLL) guidelines. However, only the expanded clay group closely approached the P standard (≤0.01 mg⋅L−1). Expanded clay and expanded shale demonstrated potential as substrates for NSP bogs. The final aboveground biomass dry weight was strongly negatively correlated with the final NO3 and P water concentrations. However, direct plant uptake proved insufficient to remove all nutrient inputs, especially for P. Except for the recycled glass group (34%), a significant portion of N (79%–90%) from total N added was removed by aboveground biomass. However, P uptake by biomass was substantially lower (18%–37%). With acceptable vigor and biomass accumulation, blue flag iris may be a suitable species for vegetated NSPs, whereas lizard’s tail is not because of uncertain establishment. Compared with controlling N, managing P for FLL standards in NSPs will be more challenging. Our work begins to fill the essential gap in the NSP literature regarding nutrient removal capabilities of substrates and vegetation. Future work should continue to study alternative substrates and plant species for P removal, particularly in field conditions and over longer periods.
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来源期刊
Horttechnology
Horttechnology 农林科学-园艺
CiteScore
2.30
自引率
10.00%
发文量
67
审稿时长
3 months
期刊介绍: HortTechnology serves as the primary outreach publication of the American Society for Horticultural Science. Its mission is to provide science-based information to professional horticulturists, practitioners, and educators; promote and encourage an interchange of ideas among scientists, educators, and professionals working in horticulture; and provide an opportunity for peer review of practical horticultural information.
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