Soil structure dynamics in constructed Technosols for bioretention cells: X-ray microtomography study

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-06-01 DOI:10.1007/s11368-024-03828-4
Petra Heckova, John Koestel, Ales Klement, Radka Kodesova, Michal Snehota
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Abstract

Purpose

Constructed Technosols are frequently used to create the biofilter layer of blue-green infrastructure elements when the local soil does not possess the necessary properties. However, the long-term functioning of the biofilter is not entirely understood. The aim of this study is to elucidate changes in the structure of a constructed Technosol based biofilter of a bioretention cell (BC) by means of x-ray tomography and additional physical characterization during the first years after installation under two different water regimes.

Methods and materials

Two identical experimental BCs were studied to investigate structural changes in biofilter. The BCs exhibited different water regimes. BC1 collected naturally occurring rain concentrated from the nearby roof, while BC2 lacked a regular inflow of water except for several irrigation events and exhibited drier conditions overall. Biofilter was constructed using a mixture of 50% sand, 30% compost, and 20% topsoil. Undistributed soil samples were collected from the biofilter at 7, 12, 18, 23, and 31 months after BC installation. The changes in the soil pore system geometry were assessed by analyzing morphological parameters derived from X-ray computed microtomography images (μCT) and additional physical parameters. The μCT images were analyzed using the SoilJ software package.

Results

In both BCs, soil consolidation accompanied by a significant reduction in macroporosity and pore connectivity, occurred between months 7 and 18 in BC1 and between months 7 and 12 in BC2. Macroporosity then gradually increased in BC1 between months 18 and 31. During the same period, in the drier soil of BC2, macroporosity and pore connectivity decreased. In BC1, the water field capacity increased between months 7 and 18, but then returned to its initial values by month 31.

Conclusion

The μCT proved to be suitable for assessing the structural changes of constructed Technosol. Significant differences in soil structure development were observed in BC, depending on the water regime. These differences were particularly evident in the development of field capacity, total porosity, and macroporosity.

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用于生物滞留细胞的人造技术溶胶中的土壤结构动力学:X 射线显微层析成像研究
目的 当当地土壤不具备必要的特性时,经常使用人造技术溶胶来创建蓝绿基础设施元素的生物过滤层。然而,人们对生物滤层的长期功能并不完全了解。本研究的目的是通过 X 射线断层扫描和其他物理特征描述,阐明基于 Technosol 的生物滞留池(BC)构建的生物滤池在安装后的头几年中,在两种不同水质条件下的结构变化。这两个生物滤池的水质不同。BC1 从附近的屋顶收集天然雨水,而 BC2 除了几次灌溉外,没有定期流入的水,总体上比较干燥。生物滤池由 50% 的沙子、30% 的堆肥和 20% 的表土混合制成。在 BC 安装后的 7、12、18、23 和 31 个月,从生物滤池中收集了未分布的土壤样本。通过分析从 X 射线计算机显微层析成像(μCT)获得的形态参数和其他物理参数,评估了土壤孔隙系统几何形状的变化。结果在 BC1 的第 7 至 18 个月和 BC2 的第 7 至 12 个月期间,两个 BC 的土壤都发生了固结,同时大孔率和孔隙连通性显著降低。BC1 的大孔隙度在第 18 至 31 个月期间逐渐增加。同期,在 BC2 较干燥的土壤中,大孔率和孔隙连通性都有所下降。在 BC1 中,水田容量在第 7 个月至第 18 个月期间有所增加,但到第 31 个月又恢复到初始值。在 BC 中观察到土壤结构发展的显著差异,这取决于水制度。这些差异在田间容量、总孔隙度和大孔隙度的发展方面尤为明显。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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