Geochemical evolution and elemental behaviour of playa sedimentsimpacts of natural weathering and agricultural practices
- László Halmos 1
- Joaquín Delgado Rodríguez 2
- Miguel Rodríguez Rodríguez 1
- Alejandro Jiménez Bonilla 1
- Manuel Díaz Azpiroz 1
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1
Universidad Pablo de Olavide
info
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2
Universidad de Sevilla
info
ISSN: 1886-7995, 1698-6180
Year of publication: 2025
Volume: 51
Issue: 3
Pages: 495-515
Type: Article
More publications in: Journal of iberian geology: an international publication of earth sciences
Abstract
Playas are predominantly alkaline wetlands common in arid and semi-arid regions. These unique ecosystems are heavily influenced by climatic and hydrological processes, such as high evapotranspiration rates and negative water balance. Numerous studies have documented the ecological degradation of these saline ecosystems due to both anthropogenic and natural processes. The present research analyses the mineralogical and elemental changes in six representative playas at different degradation stages in the western External Betics. Chemical weathering and element fractionation were examined to identify the key geochemical factors involved in the degradation of these playa wetlands. A novel methodology for calculating the Fractionation Index (FI) has been developed and applied alongside established geochemical indices, such as the Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Vogt’s Residual Index (VRI), as well as analyses of elemental distribution. This approach allows for a comprehensive differentiation of the geochemical processes occurring in nonsaline-alkali, saline-alkali, and degraded playas. The study highlights the role of alkalinity in promoting clay mineral formation, with Na+ and Ca2+ dominating the cationic composition. These findings provide insights into the dynamics of playa ecosystems and inform conservation strategies for managing these vulnerable environments.
Funding information
Funders
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Ministerio de Ciencia e Innovación
- PGC2018–100914-B-100
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Consejería de Universidad, Investigación e Innovación, Junta de Andalucía
- Project RNM356
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Universidad Pablo de Olavide
- Project PID2022–140322NB-I00
- Universidad Pablo de Olavide
Bibliographic References
- Aboukila, E. F., & Norton, J. B. (2017). Estimation of saturated soil paste salinity from soil-water extracts. Soil Science, 182, 107–113.
- Adriano, D. C. (1986). Trace elements in the terrestrial environment (550 p). Springer-Verlag.
- Al-Busaidi, S., & Cookson, J. (2003). Salinity – pH relationships in calcareous soils of Oman. Agricultural and Marine Sciences, 8(1), 41–46.
- Alengebawy, A., Abdelkhalek, S. T., Qureshi, S. R., & Wang, M.-Q. (2021). Heavy metals and pesticides toxicity in agricultural soil and plants: Ecological risks and human health implications. Toxics, 9(3), 42. https://doi.org/10.3390/toxics9030042
- Arany, S. (1956). A szikes talaj és javítása [Alkali soil and its improvement] (407 p). Mezőgazdasági Kiadó.
- Balanyá, J. C., Crespo-Blanc, A., Díaz-Azpiroz, M., Expósito, I., Torcal, F., Pérez-Peña, V., & Booth-Rea, G. (2012). Brittle-ductile shear zones and their tectonic significance in the Betic Cordillera. Geologica Acta, 10, 249–263.
- Barahona, F. E. (1974). Arcillas de ladrillería de la provincia de Granada. Evaluación de algunos ensayos de materias primas [Brick clays of the province of Granada: Evaluation of some raw material tests] (398 p). Ph.D. thesis, University of Granada.
- Beck, H. E., Zimmermann, N. E., McVicar, T. R., Vergopolan, N., Berg, A., & Wood, E. F. (2020). Present and future KöppenGeiger climate classification maps at 1-km resolution. Scientific Data, 7, Article 274.
- Bengtsson, L., & Enell, M. (1986). Chemical analysis. In B. E. Berglund (Ed.), Handbook of holocene palaeoecology and palaeohydrology (pp. 423–455). John Wiley & Sons.
- Boës, X., Rydberg, J., Martinez-Cortizas, A., Bindler, R., & Renberg, I. (2011). Evaluation of conservative lithogenic elements (Ti, Zr, Al, and Rb) to study anthropogenic element enrichments in lake sediments. Journal of Paleolimnology, 46, 75–87. https://doi.org/ 10.1007/s10933-011-9515-z
- Bohn, H. L., McNeal, B. L., & O’Connor, G. A. (2001). Soil chemistry (3rd ed., 307 p) John Wiley & Sons.
- Boros, E. (2002). Szikes Tavak [Saline lakes]. In: Környezetvédelmi Minisztérium, Természetvédelmi Hivatal (Vol. 1, 28 p). ISBN 963-00-7168.
- Boros, E., & Biró, Cs. (1999). A Duna-Tisza közi szikes tavak ökológiai állapotváltozásai a XVIII–XX. századokban [Ecological changes in natron lakes of the Danube–Tisza Interfluve between the 18th and 20th centuries]. Acta Biologica Debrecina Oecologica Hungarica, 9, 81–105.
- Bowell, R. J., & Bruce, K. A. (1995). Geochemistry of playa lakes in the southern High Plains, Texas: Evaporation processes and mineral precipitations. Journal of Sedimentary Research, 65(1), 213–223. https://doi.org/10.1306/D4267A2E-2B26-11D7-86480 00102C1865D
- Boyd, R. (2000). Soil chemistry and its effects on salinity. Soil Science Society of America Journal, 64, 650–657.
- Braun, J. J., Kun, R., & Graham, I. (1989). Behavior of rare earth elements in sedimentary systems: An overview. Geochimica Et Cosmochimica Acta, 53, 65–76.
- Castañeda, C., & Herrero, J. (2007). Assessing the degradation of saline wetlands in an arid agricultural region in Spain. CATENA, 72, 205–213.
- Chorom, M., & Rengasamy, P. (1997). Influence of water coverage on sediments in Gosque playa. Soil Research, 35, 837–851.
- Dean, W. E. (1974). Determination of carbonate and organic matter in calcareous sediments and sedimentary rocks by loss on ignition: Comparison with other methods. Journal of Sedimentary Petrology, 44, 242–248.
- Díaz-Azpiroz, M., Barcos, L., Balanyá, J. C., Fernández, C., Expósito, I., & Czeck, D. M. (2014). Applying a general triclinic transpression model to highly partitioned brittle-ductile shear zones: A case study from the Torcal de Antequera massif, External Betics, southern Spain. Journal of Structural Geology, 68, 316–336. https://doi.org/10.1016/j.jsg.2014.05.010
- Erdélyi, M. (1976). Electrical conductivity in soils and saline water bodies. Agricultural Water Management, 1, 23–37.
- Fedo, C. M., Nesbitt, H. W., & Young, G. M. (2013). Unraveling the history of weathering and sediment transport in a sedimentary basin: The role of chemical indices. Geological Society of America Bulletin, 125, 953–973.
- Fiantis, D. M., Price, P. B., & Velbel, M. A. (2010). Weathering indices for clays: A new perspective on their use. Applied Clay Science, 50, 1–9.
- Galán, E., de La Rosa, J., Carrasco, J., & Pérez, M. (1999). Background levels of lead in soils in Andalusia. Environmental Geochemistry and Health, 21, 353–361.
- Galán, E., Romero, A., Aparicio, P., & González, I. (2004). Estudio de elementos traza en los suelos de Andalucía. Consejería de Medio Ambiente, Junta de Andalucía.
- García, R., Jiménez Bonilla, A., Díaz-Azpiroz, M., Pérez Valera, F., Balanyá, J. C., & Expósito, I. (2016). Kinematics and geomorphology of the Algodonales-Badolatosa shear zone at the foldand-thrust belt of the western Subbetics. Geo-Temas, 16, 547–550.
- Ge, Y., Abuduwaili, J., & Ma, L. (2019). Lakes in arid land and saline dust storms. 3S Web of Conferences, 99, Article 01007. https:// doi.org/10.1051/e3sconf/20199901007
- Goman, M., Ashley, G. M., Owen, R. B., Hover, V. C., & Maharjan, D. K. (2017). Late holocene environmental reconstructions from Lake Solai, Kenya. The Professional Geographer. https://doi.org/ 10.1080/00330124.2016.1266948
- Gurdak, J. J., & Roe, C. D. (2009). Recharge rates and chemistry beneath playas of the High Plains Aquifer—A literature review and synthesis (U.S. Geological Survey Circular 1333). U.S. Department of the Interior, U.S. Geological Survey. https://pubs. usgs.gov/circ/1333/
- Halmos, L., Bozsó, G., & Pál-Molnár, E. (2013). Periodical altering of pH and EC in saline lake sediments, southern Hungary. In Z. Galbács (Ed.), Proceedings of the 19th international symposium on analytical and environmental problems (pp. 201–204). MTA SZAB.
- Halmos, L., Bozsó, G., & Pál-Molnár, E. (2014). Alkaline lake system in Danube and Tisza interfluve (Szeged, HU) – Climate change and landscape degradation. Visegrad Journal on Bioeconomy and Sustainable Development, 3, 77–81.
- Halmos, L., Bozsó, G., & Pál-Molnár, E. (2015). A szegedi Fehér-tó szikes üledékeinek évszakos geokémiai változásai [Seasonal geochemical variations of saline sediments in Lake Fehér, Szeged]. In E. Pál-Molnár, B. Raucsik, & A. Varga (Eds.), Meddig ér a takarónk? A magmaképződéstől a regionális litoszféra formáló folyamatokig (pp. 60–63). SZTE TTIK Ásványtani, Geokémiai és Kőzettani Tanszék.
- Halmos, L., Delgado Rodríguez, J., Rodríguez-Rodríguez, M., Jiménez Bonilla, A., & Díaz Azpiroz, M. (2022). Physicochemical characteristics of playa-lake sediments located in the western External Betics. Geogaceta, 72, 39–42.
- Harnois, L., & Moore, J. M. (1988). Geochemistry and origin of the Ore Chimney Formation, a transported paleoregolith in the Grenville Province of southeastern Ontario, Canada. Chemical Geology, 69(3–4), 267–289. https://doi.org/10.1016/0009-2541(88)90105-9
- Heidari, M., Khademi, H., & Ardakani, A. A. (2022). Changes in chemical weathering indices in soils developed on volcanic rocks. Environmental Monitoring and Assessment, 194, 1–12.
- Höbig, N., Mediavilla, R., Gibert, L., & Santisteban, J. I. (2016). Palaeohydrological evolution and implications for palaeoclimate since the late glacial at de Fuente de Piedra, southern Spain. Quaternary International, 407(A), 1–18. https://doi.org/10.1016/j.quaint. 2016.02.051
- Hoogsteen, M., Lantinga, E., Bakker, E. J., Groot, J., & Tittonell, P. A. (2015). Estimating soil organic carbon through loss on ignition: Effects of ignition conditions and structural water loss. European Journal of Soil Science. https://doi.org/10.1111/ejss.12224
- Hudson-Edwards, K. A., & Macklin, M. G. (1999). Geochemical and mineralogical controls on the trace element composition of river sediments in a mineralized catchment. Geochimica Et Cosmochimica Acta, 63(1), 181–196. https://doi.org/10.1016/S0016- 7037(98)00167-5
- ISO. (2005). Soil quality – Determination of pH (ISO 10390:2005). International Organization for Standardization.
- ISO. (2006). Soil quality – Pretreatment of samples for physico-chemical analysis (ISO 11464:2006). International Organization for Standardization.
- Ji, W., & Peters, A. J. (2003). Assessing vegetation response to climate variability using AVHRR data in a playa wetland area. International Journal of Remote Sensing, 24, 2505–2517.
- Jiménez-Bonilla, A., Díaz-Azpiroz, M., & Rodríguez, M. R. (2023). Tectonics may affect closed watersheds used to monitor climate change and human activity effects. Terra Nova, 35(1), 58–65. https://doi.org/10.1111/ter.12629
- Jiménez-Bonilla, A., Díaz-Azpiroz, M., Rodríguez-Rodríguez, M., Balanyá, J. C., & Expósito, I. (2024). Tectonic controls on drainage network, topographic barriers building and the development of endorheic areas in the western Betics (S Spain): Implications on the evolution of the Atlantic–Mediterranean water divide. SSRN. https://doi.org/10.2139/ssrn.4547068
- Jiménez-Bonilla, A., Expósito, I., Balanyá, J. C., Díaz-Azpiroz, M., & Barcos, L. (2015). The role of strain partitioning on intermontane basin inception and isolation, External Western Gibraltar Arc. Journal of Geodynamics, 92, 1–17. https://doi.org/10.1016/j.jog. 2015.09.001
- Jiménez-Bonilla, A., Expósito Ramos, I., Díaz-Azpíroz, M., Balanyá, J. C., & Crespo-Blanc, A. (2022). Strain partitioning and localization due to detachment heterogeneities in fold-and-thrust belts of progressive arcs: Results from analog modeling. Tectonics, 41(12), Article e2021TC006955. https://doi.org/10.1029/2021T C006955
- Kabata-Pendias, A. (2010). Trace elements in soils and plants (4th ed.). CRC Press. https://doi.org/10.1201/b10158
- Kharaka, Y. K., & Hanor, J. S. (2007). Deep fluids in sedimentary basins. In K. K. Turekian & H. D. Holland (Eds.), Treatise on geochemistry (Vol. 5, pp. 499–540). Elsevier.
- Kome, G. K., Enang, R. K., Yerima, B. P. K., & Lontsi, M. G. R. (2018). Models relating soil pH measurements in H2O, KCl and CaCl2 for volcanic ash soils of Cameroon. Geoderma Regional, 14, Article e00185. https://doi.org/10.1016/j.geodrs.2018.e00185
- Kumar, M., Kumar, R., Singh, C. K., & Kumar, A. (2024). Identification of playa lakes and tracking their evolution pathways using geochemical models in the Great Indian Thar Desert. Science of the Total Environment, 912, Article 169250. https://doi.org/10. 1016/j.scitotenv.2023.169250
- Libohova, Z., Wills, S., Odgers, N. P., Ferguson, R., Nesser, R., Thompson, J. A., West, L. T., & Hempel, J. W. (2014). Converting pH 1:1 H2O and 1:2 CaCl2 to 1:5 H2O to contribute to a harmonized global soil database. Geoderma, 213, 544–550. https://doi.org/10.1016/j.geoderma.2013.08.014
- Luo, H. R., Smith, L. M., Allen, B. L., & Haukos, D. A. (1997). Effects of sedimentation on playa wetland volume. Ecological Applications, 7, 247–252. https://doi.org/10.1890/10510761(1997) 007[0247]2.0.CO;2
- MacLean, W. H. (1990). Mass change calculations in altered rock series. Mineralium Deposita, 25, 44–49. https://doi.org/10.1007/ BF00206475
- Martín Pozas, J.M. (1978). Análisis cuantitativo de fases cristalinas por D.R. [Quantitative analysis of crystalline phases by X-ray diffraction (XRD)]. In J. A. de Saja (Ed.), III Seminario sobre difracción por muestras policristalinas: Método de Debye–Scherrer. Instituto de Ciencias de la Educación, Universidad de Valladolid, 10–13 de abril de 1978.
- Martín-Puertas, C., Valero-Garcés, B. L., Brauer, A., Mata, M. P., Delgado-Huertas, A., & Dulski, P. (2009). The Iberian-Roman humid period (2600–1600 cal yr BP) in the Zoñar Lake varve record (Andalucía, southern Spain). Quaternary Research, 71(2), 108–120.
- McLennan, S. M. (1989). Rare earth elements in sedimentary rocks: Influence of provenance and sedimentary process. In B. R. Lipin & G. A. McKay (Eds.), Geochemistry and mineralogy of rare earth elements (Vol. 21, pp. 169–200). Mineralogical Society of America.
- McLennan, S. M., Hemming, S., McDaniel, D. K., & Hanson, G. N. (1993). Geochemical approaches to sedimentation, provenance and tectonics. In M. J. Johnsson & A. Basu (Eds.), Processes controlling the composition of clastic sediments (Vol. 285, pp. 21–40). Geological Society of America, Special Papers. https:// doi.org/10.1130/SPE284-p21
- Nebel, O. (2016). Strontium. In W. M. White (Ed.), Encyclopedia of Geochemistry (Encyclopedia of Earth Sciences Series). Springer. https://doi.org/10.1007/978-3-319-39193-9_138-1
- Nesbitt, H. W., & Markovics, G. (1997). Weathering of granodioritic crust, long-term storage of elements in weathering profiles, and petrogenesis of siliciclastic sediments. Geochimica Et Cosmochimica Acta, 61(8), 1653–1670. https://doi.org/10.1016/S0016- 7037(97)00031-8
- Nesbitt, H. W., & Young, G. M. (1982). Early proterozoic climates and plate motions inferred from major element chemistry of lutites. Nature, 299(5885), 715–717. https://doi.org/10.1038/299715a0
- Nesbitt, H. W., Young, G. M., McLennan, S. M., & Keays, R. R. (1996). Effects of chemical weathering and sorting on the petrogenesis of siliciclastic sediments, with implications for provenance studies. The Journal of Geology, 104(5), 525–542. https://doi.org/10.1086/629850
- Paul, A. Q., Dar, S. A., Singh, B. P., Kumar, H., & Ahmad, M. (2023). Geochemistry of recent sediments of the Kurheri basin, Son River, Madhya Pradesh, Central India: Implications for source area weathering, sediment provenance, maturity, and sorting. Arabian Journal of Geosciences, 112, 1803–1821. https://doi.org/10.1007/ s12517-023-11453-z
- Pedrera, A., Martos-Rosillo, S., Galindo Zaldívar, J., & RodríguezRodríguez, M. (2016). Unravelling aquifer-wetland interaction using CSAMT and gravity methods: The Mollina-Camorra aquifer and the Fuente de Piedra playa-lake, southern Spain. Journal of Applied Geophysics, 129, 17–27. https://doi.org/10.1016/j.jappg eo.2016.03.018
- Pimentel, D., & Pimentel, M. (2003). Sustainability of meat-based and plant-based diets and the environment. The American Journal of Clinical Nutrition, 78, 660S-663S. https://doi.org/10.1093/ajcn/ 78.3.660S
- Price, J. R., & Velbel, M. A. (2003). Chemical weathering indices applied to weathering profiles developed on heterogeneous felsic metamorphic parent rocks. Chemical Geology, 202(3–4), 397– 416. https://doi.org/10.1016/j.chemgeo.2002.11.001
- Price, J. R., & Velbel, M. A. (2003). Chemical weathering indices applied to weathering profiles developed on heterogeneous felsic metamorphic parent rocks. Chemical Geology, 202, 397–416. https://doi.org/10.1016/S0009-2541(03)00318-6
- Pueyo, J. J., & Valero-Garcés, B. L. (1996). Geochemistry and mineralogy of saline and alkaline lakes of the Atacama Desert, northern Chile. Chemical Geology, 127(2), 141–162. https://doi.org/10. 1016/S0009-2541(96)00030-9
- Rakonczai, J., & Bódis, K. (2002). A környezeti változások következményei az Alföld felszín alatti vízkészleteiben (The consequences of environmental changes on the groundwater resources of the Great Hungarian Plain). In Jakucs László, a tudós, az ismeretterjesztő és a művész (pp. 227–238).
- Reimann, C., Flem, B., Fabian, K., Birke, M., Ladenberger, A., Négrel, P., Demetriades, A., Hoogewerff, J., The GEMAS Project Team. (2012). Lead and lead isotopes in agricultural soils of Europe – The continental perspective. Applied Geochemistry, 27(3), 532– 542. https://doi.org/10.1016/j.apgeochem.2011.12.012
- Rengasamy, P. (2006). World salinization with emphasis on Australia. Journal of Experimental Botany, 57, 1017–1023.
- Reynolds, R. L., & Goldstein, H. L. (2010). Dust emission from wet and dry playas in the Mojave Desert, USA. Aeolian Research, 2(1), 67–74. https://doi.org/10.1016/j.aeolia.2010.01.001
- Richards, L. A. (1954). Diagnosis and improvement of saline and alkali soils (Agricultural handbook, Vol. 60). U.S. Department of Agriculture.
- Roaldset, E. (1972). Mineralogy and geochemistry of quaternary clays in the Numedal area, Southern Norway. Norsk Geologisk Tidsskrift, 52, 335–369.
- Robbins, C. R. (2004). The role of agriculture in soil degradation and restoration. Environmental Geochemistry and Health, 26(1), 99–112. https://doi.org/10.1023/B:EGEH.0000020287.94786.95
- Rodríguez-Rodríguez, M., Green, A. J., López, R., & Martos-Rosillo, S. (2012). Changes in water level, land use, and hydrological budget in a semi-permanent playa lake, Southwest Spain. Environmental Monitoring and Assessment, 184, 797–810.
- Rodríguez-Rodríguez, M., Martos-Rosillo, S., Pedrera, A., & Benavente, E. J. (2015). Ratosa playa-lake in southern Spain: Karst pan or compound sink? Environmental Monitoring and Assessment, 187(4), 175–190.
- Rodríguez-Rodríguez, M., Moral, F., Benavente, J., & Beltrán, M. (2010). Developing hydrological indices in semi-arid playa-lakes by analyzing their main morphometric, climatic, and hydrochemical characteristics. Journal of Arid Environments, 74, 1478–1486.
- Sappal, S. M., Ramanathan, A., Ranjan, R. K., Singh, G., & Kumar, A. (2014). Rare earth elements as biogeochemical indicators in mangrove ecosystems (Pichavaram, Tamil Nadu, India). Journal of Sedimentary Research, 84(9), 781–791. https://doi.org/10.2110/ jsr.2014.63
- Schultz, T. W. (1964). Transforming traditional agriculture. Yale University Press.
- Sinha, Shyama P. (1983). The Europium anomaly. In S. P. Sinha (Ed.), Systematics and the Properties of the Lanthanides (pp. 550–553). D. Reidel Publishing Company. ISBN 978-90-277-1613-2.
- Sousa, A., & García-Murillo, P. (2003). Changes in the wetlands of Andalusia (Doñana Natural Park, SW Spain) at the end of the Little Ice Age. Climatic Change, 58(1–2), 193–217. https://doi. org/10.1023/A:1023421202961
- Stefanovits, P., Füleky, G., & Filep, G. (2010). Talajtan [Soil science] (470 p). Mezőgazda Kiadó. ISBN 963-286-178-7.
- Sumner, M. E. (Ed.). (1995). Handbook of soil science (1600p). CRC Press.
- Toth, J. (1963). A theoretical analysis of groundwater flow in small drainage basins. Journal of Geophysical Research, 68(16), 4795– 4812. https://doi.org/10.1029/JZ068i016p04795
- Tóth, T. (2005). Dynamics of salt accumulation in the Danube Valley. In International salinity forum managing saline soils and water: Science, technology and social issues, Oral Presentation Abstracts, Riverside Convention Center, Riverside, California, USA, 25–28 April 2005 (pp. 449–452).
- Tóth, T., Molnár, S., Balog, K., & Bakacsi, Z. (2015). A Duna-Tisza közi hátság szikes tavainak kilúgzási folyamatai a Szappanos-tó példáján [Leaching processes of salt-affected lakes on the Danube-Tisza Interfluve: The case of Lake Szappanos]. Agrokémia és Talajtan, 64(1), 73–92. https://doi.org/10.1556/0088.2015.64.1.6
- Tripp, H., Crosman, E., Johnson, J., Rogers, W., & Howell, N. (2022). The feasibility of monitoring Great Plains playa inundation with the Sentinel 2A/B satellites for ecological and hydrological applications. Water (Basel), 14, 2314. https://doi.org/10.3390/w1415 2314
- Walling, D. E. (2006). Human impact on land-ocean sediment transfer by the world’s rivers. Geomorphology, 79, 192–216.
- Wei, G., Liu, Y., Li, X., Shao, L., & Liang, X. (2003). Climatic impact on Al, K, Sc and Ti in marine sediments: Evidence from ODP site 1144, South China Sea. Geochemical Journal, 37, 593–602. https://doi.org/10.2343/geochemj.37.593
- Wintsch, R. P., & Kvale, C. M. (1994a). Differential mobility of elements in burial diagenesis of siliciclastic rocks. Journal of Sedimentary Research a: Sedimentary Petrology and Processes, 64(2a), 349–361.
- Xu, X., Zhao, Y., Zhao, X., Wang, Y., & Deng, W. (2014). Sources of heavy metal pollution in agricultural soils of a rapidly industrializing area in the Yangtze delta of China. Ecotoxicology and Environmental Safety, 108, 161–167. https://doi.org/10.1016/j. ecoenv.2014.06.019
- Zhang, K., & Shields, G. A. (2022). Sedimentary Ce anomalies: Secular change and implications for paleoenvironmental evolution. Earth-Science Reviews, 229(1–2), Article 104015. https://doi. org/10.1016/j.earscirev.2022.104015
- Zhou, L., Yang, B., Xue, N., Li, F., Seip, H. M., Cong, X., Yan, Y., Liu, B., Han, B., & Li, H. (2014). Ecological risks and potential sources of heavy metals in agricultural soils from Huanghuai Plain, China. Environmental Science and Pollution Research, 21(1), 1360–1369. https://doi.org/10.1007/s11356-013-2023-0