圣地亚哥-德孔波斯特拉(西班牙)城市土壤的物理特性

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
R. Paradelo, C. Herbón, M. T. Barral
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引用次数: 0

摘要

目的恶劣的物理条件是城市土壤的一个典型特征,它降低了土壤在植物生产或水循环方面的功能。在这项工作中,我们研究了圣地亚哥-德孔波斯特拉(西班牙)的 64 种城市土壤,这些土壤的母质不同,土地用途也各异。我们在实地和实验室评估了这些土壤的物理特性,测量了体积密度和孔隙度、持水能力、骨料稳定性和水分散粘土、渗透性和抗渗透性。结果表明,这些土壤具有城市土壤常见的异质性物理性质。由于有机质和铁的含量较高,土壤的体积密度较低,集聚稳定性较高。压实问题普遍存在,但取决于土地用途:一般来说,与城市草地和森林相比,城市农业用地土壤的渗透性更高,压实程度更低。尽管存在压实问题,但观察到的高渗透值可能是由于大量的粗碎屑和优先流造成的。结论总体而言,从 K 因子值来看,城市土壤潜在的侵蚀风险较低,但要降低实际侵蚀率,合理的管理是必不可少的,因为地形、气候因素以及人类行为在某些地方很容易增加侵蚀风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Physical properties of the urban soils of Santiago de Compostela (Spain)

Physical properties of the urban soils of Santiago de Compostela (Spain)

Purpose

Poor physical conditions are a typical feature of urban soils that reduce their functionality regarding plant production or the water cycle. However, the increasing importance of urbanization makes it necessary to carry out additional research on physical properties of urban soils.

Methods

In this work, we have studied 64 urban soils in Santiago de Compostela (Spain), over different parent materials and under several land uses. We assessed their physical properties in the field and laboratory, with measures of bulk density and porosity, water holding capacity, aggregate stability and water-dispersible clay, permeability and resistance to penetration. The erosion risk was assessed by estimation of the k factor in the RUSLE.

Results

The results show that the soils present heterogeneous physical properties, as common in urban soils. As a result of high organic matter and Fe contents, the soils present low bulk densities and high aggregate stability. Compaction issues are widespread but dependent on land use: in general soils under urban agriculture use present higher permeability and lower compaction levels than urban grasslands and forests. High infiltration values observed despite compaction are likely due to the abundance of coarse fragments and preferential flow.

Conclusion

Overall, urban soils have potentially low erosion risk as shown by the K factor values, but sound management is essential to keep actual erosion rates down, because relief, climatic factors as well as human behavior are susceptible of increasing erosion risk at some points.

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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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