Spatiotemporal investigation of geochemical and hydrological controls on release of soluble reactive phosphorus from the shallow aquifer of a riparian zone

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Shuyang Wang, James W. Roy, Christopher Power, Clare E. Robinson
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Abstract

Phosphorus (P) that accumulates in agricultural riparian zones can be released under certain hydrological and biogeochemical conditions, thereby limiting the effectiveness of these zones in reducing P loads from field to stream. The study objective was to explore factors that may be contributing to, or limiting, high soluble reactive phosphorus (SRP) concentrations in the shallow aquifer of an alluvial upland riparian zone located in a continental climate. Field investigations including porewater sampling from six vertical nests, soil sampling, and continuous soil moisture, groundwater table, and redox measurements were conducted over 19 months. Porewater SRP concentrations were generally low in the aquifer considering all sampling times (median = 14.7 µg/L; interquartile range [IQR] = 11.1 µg/L, 287 samples). The overall low SRP may be due to low reducible labile soil P (median = 21.1 µgP/g dw, IQR = 10.9 µgP/g dw, 21 samples). However, high SRP concentrations (>52 µg/L, 95% quartile) did occur intermittently in space and time with no clear spatial or temporal patterns. Analyses indicate that most high concentrations were likely not associated with factors previously reported to influence SRP release in riparian aquifers, including redox conditions, pH, and soil drying and wetting. Further, data indicate that internally released or externally supplied SRP may undergo rapid (re-) sequestration within the aquifer, limiting its vertical or horizontal transport. The study findings highlight the complexity of P behavior in riparian zones and the need for caution when assessing the effectiveness of conservation practices and in interpreting potential impacts of subsurface water quality on stream water quality when monitoring locations are distant from the stream.

Abstract Image

对河岸带浅层含水层可溶性活性磷释放的地球化学和水文控制的时空调查。
在某些水文和生物地球化学条件下,农业河岸带中积累的磷(P)会被释放出来,从而限制了这些河岸带减少从田地到溪流的磷负荷的效果。这项研究的目的是探讨可能导致或限制大陆性气候冲积高地河岸带浅层含水层中可溶性活性磷(SRP)浓度过高的因素。在 19 个月的时间里进行了实地调查,包括从六个垂直巢穴进行孔隙水取样、土壤取样以及连续的土壤湿度、地下水位和氧化还原测量。从所有取样时间来看,含水层中的孔隙水 SRP 浓度普遍较低(中位数 = 14.7 µg/L;四分位数间距 [IQR] = 11.1 µg/L,287 个样本)。总体 SRP 较低的原因可能是土壤中可还原的可溶性 P 较低(中位数 = 21.1 µgP/g dw,IQR = 10.9 µgP/g dw,21 个样本)。然而,高浓度的 SRP(>52 µg/L,95% 四分位数)确实在空间和时间上间歇出现,没有明显的空间或时间模式。分析表明,大多数高浓度可能与之前报道的影响河岸含水层中 SRP 释放的因素无关,这些因素包括氧化还原条件、pH 值以及土壤干燥和潮湿。此外,数据还表明,内部释放或外部供应的 SRP 可能会在含水层中快速(再)固存,从而限制其垂直或水平迁移。研究结果突显了钾在河岸地带行为的复杂性,以及在评估保护措施的有效性和解释地下水质对溪流水质的潜在影响时(当监测点远离溪流时)需要谨慎的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of environmental quality
Journal of environmental quality 环境科学-环境科学
CiteScore
4.90
自引率
8.30%
发文量
123
审稿时长
3 months
期刊介绍: Articles in JEQ cover various aspects of anthropogenic impacts on the environment, including agricultural, terrestrial, atmospheric, and aquatic systems, with emphasis on the understanding of underlying processes. To be acceptable for consideration in JEQ, a manuscript must make a significant contribution to the advancement of knowledge or toward a better understanding of existing concepts. The study should define principles of broad applicability, be related to problems over a sizable geographic area, or be of potential interest to a representative number of scientists. Emphasis is given to the understanding of underlying processes rather than to monitoring. Contributions are accepted from all disciplines for consideration by the editorial board. Manuscripts may be volunteered, invited, or coordinated as a special section or symposium.
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