Daniel F. Petticord, Elizabeth H. Boughton, Haoyu Li, Jiangxiao Qiu, Amartya Saha, Ran Zhi, Jed P. Sparks
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Pots containing <i>P. notatum</i> plants leached significantly more phosphorus than pots containing <i>C. nlemfuensis</i> or empty pots with no plants growing in them, despite losing an equivalent amount of water. <i>H. altissima</i> lost equivalent amounts of phosphorus in leachate water, but each <i>H. altissima</i> plant removed approximately 33.6 mg of phosphorus, approximately 2.5× that removed by <i>P. notatum</i> (13.4 mg). <i>C. nlemfuensis</i> had lower average leachate phosphorus concentrations at each biweekly sampling than either plant species (<i>C. nlemfuensis-P. notatum</i>, <i>p</i><sub>adj</sub> = 0.001; <i>C. nlemfuensis-H. altissima</i>, <i>p</i><sub>adj</sub> = 0.02), averaging only 0.110 ppm in leachate relative to 0.175 ppm and 0.200 ppm in pots beneath <i>H. altissima</i> and <i>P. notatum</i>, respectively. This, combined with <i>C. nlemfuensis</i>' slightly higher-than-average aboveground P content and overall aboveground biomass expression suggest it is the best possible phytoremediation candidate. As even minor leachate P loads can be critically threatening to neighboring oligotrophic water bodies, if the conservation of downstream environments is the priority, the short-term threat of increased leachate must be considered. 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引用次数: 0
摘要
历史上施肥造成的磷的逐渐积累会增加地下沥滤损失的可能性,从而导致地表水富营养化。牧场是需要重点关注的地区,而牧场的植物修复工作则优先考虑可用作牛饲料的牧草。本研究调查了三种不同牧草--Paspalum notatum、Hemarthria altissima 和 Cynodon nlemfuensis 对地表土壤沥滤液中磷流失的影响。该实验采用了嵌套盆中介宇宙设计,使我们能够在 3 个月内每两周监测一次沥滤液的量和浓度。与含有 C. nlemfuensis 的花盆或没有种植植物的空花盆相比,含有 P. notatum 植物的花盆沥滤的磷明显更多,尽管损失的水量相当。H. altissima 在沥滤液中损失了等量的磷,但每株 H. altissima 植物去除约 33.6 毫克磷,约为 P. notatum(13.4 毫克)的 2.5 倍。在每两周一次的取样中,C. nlemfuensis 的平均沥滤液磷浓度低于任何一种植物(C. nlemfuensis-P. notatum,padj = 0.001;C. nlemfuensis-H. altissima,padj = 0.02),沥滤液中的平均浓度仅为 0.110 ppm,而在 H. altissima 和 P. notatum 下的花盆中分别为 0.175 ppm 和 0.200 ppm。这一点,再加上 C. nlemfuensis 略高于平均水平的地上部分 P 含量和总体地上部分生物量表现,表明它是可能的最佳植物修复候选者。由于即使是微量的沥滤液 P 负荷也会对邻近的寡营养水体造成严重威胁,因此如果要优先保护下游环境,就必须考虑沥滤液增加的短期威胁。还需要进一步的研究来探索这些发现的潜在机制和实地影响。
Planted species influences soil phosphorus losses in a historically fertilized pasture system: A mesocosm study
The gradual accumulation of phosphorus from historical fertilization can contribute to the eutrophication of surface waters by increasing the potential for subsurface leaching losses. Grazing lands areas are a priority for concern, and phytoremediation efforts in grazing lands have prioritized grasses that may be used as forage for cattle. This study investigated the influence of three different forage species—Paspalum notatum, Hemarthria altissima, and Cynodon nlemfuensis—on the loss of phosphorus in leachate from surface soils. The experiment used a nested pot mesocosm design that allowed us to monitor leachate volume and concentration biweekly over the course of 3 months. Pots containing P. notatum plants leached significantly more phosphorus than pots containing C. nlemfuensis or empty pots with no plants growing in them, despite losing an equivalent amount of water. H. altissima lost equivalent amounts of phosphorus in leachate water, but each H. altissima plant removed approximately 33.6 mg of phosphorus, approximately 2.5× that removed by P. notatum (13.4 mg). C. nlemfuensis had lower average leachate phosphorus concentrations at each biweekly sampling than either plant species (C. nlemfuensis-P. notatum, padj = 0.001; C. nlemfuensis-H. altissima, padj = 0.02), averaging only 0.110 ppm in leachate relative to 0.175 ppm and 0.200 ppm in pots beneath H. altissima and P. notatum, respectively. This, combined with C. nlemfuensis' slightly higher-than-average aboveground P content and overall aboveground biomass expression suggest it is the best possible phytoremediation candidate. As even minor leachate P loads can be critically threatening to neighboring oligotrophic water bodies, if the conservation of downstream environments is the priority, the short-term threat of increased leachate must be considered. Further research is needed to explore the underlying mechanisms and field-scale implications of these findings.
期刊介绍:
The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.