Speciation characteristics and ecological risk assessment of heavy metals in sediments from Caohai Lake, Guizhou Province

Lin, Shaoxia; Liu, Xiaolan; Zhang, Zhuanling; Zhang, Qinghai

doi:10.1007/s00477-022-02236-9

Cited by 13 publications

(3 citation statements)

References 27 publications

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“…Caohai Lake is a typical Chinese subtropical karst plateau wetland ecosystem, and its ecological milieu is highly representative in terms of its vulnerability, typicality, significance and biodiversity [28] and has also faced serious threats to its ecological environment. On the one hand, the surface around the Caohai Lake basin is exposed and precipitation in Caohai more concentrated, and high surface runoff and strong soil erosion cause the accumulation of large amounts of sediment to be carried into the lake [29]. On the other hand, change in land use patterns/ human activities have created environmental problems like soil erosion in recent decades, seriously threatening the sustainability of wetland ecosystems themselves and their ecological services [30,31].…”

Section: Introductionmentioning

confidence: 99%

Response of the Stability of Soil Aggregates and Erodibility to Land Use Patterns in Wetland Ecosystems of Karst Plateau

Cen,

Peng,

Dai

2024

Forests

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The world’s natural wetlands, which have important ecological functions, are being lost at an alarming rate. The erosion and deposition of soil on wetlands is a major cause of wetland conversion to agriculture. An urgent problem to be solved is how to slow down the erosion and deposition of wetlands resulting from land use. Land use patterns affect soil properties, thereby affecting soil aggregate stability and erodibility. Evaluating the effects of land use patterns on soil aggregate stability and erodibility in small watersheds of wetland ecosystems of karst plateau is of great importance. Thus, we compared the soil properties, aggregate stability indicators and soil erodibility of shrubland, grassland, artificial forest land and sloping farmland for evaluating the impact of various land use patterns on soil aggregate stability and erodibility in typical karst plateau wetland ecosystems. Our results showed that the mass fraction of soil aggregates > 0.25 mm was the main component in the four land uses, with greater variation in aggregates > 5 mm; overall, MWD, GMD and WSA0.25 were higher in grassland and shrubland than in sloping farmland and artificial forest land, while K values, PAD and SCAI showed the opposite trend. Correlation analysis showed that effective soil nutrients had a positive effect on soil aggregate stability. In conclusion, the stability of soil aggregates and resistance to soil erosion were strongest under the influence of shrubland. Our study showed that shrubland can better improve soil aggregate stability and erosion resistance, which may provide a guide for protecting and restoring karst plateau wetland ecosystems.

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Section: Introductionmentioning

confidence: 99%

Response of the Stability of Soil Aggregates and Erodibility to Land Use Patterns in Wetland Ecosystems of Karst Plateau

Cen,

Peng,

Dai

2024

Forests

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“…Wetland Caohai is the source lake of Luoze River, a tributary of the Yangtze basin, which is one of the three largest plateau wetland systems situated on Yungui Plateau of Guizhou Province in the southwest of China [ 23 ]. It is a typical representative of the subtropical highland wetland ecosystem developed in this famous karst basin, with a mean depth of 1.35 m and a surface area of 96 km 2 .…”

Section: Introductionmentioning

confidence: 99%

Occurrence, Distribution, and Risk Assessment of Antibiotics in the Aquatic Environment of the Karst Plateau Wetland of Yangtze River Basin, Southwestern China

Guo

Wang

Peng

et al. 2022

IJERPH

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In this study, the occurrence, distribution, and ecological risk of 40 commonly used antibiotics, including 15 sulfonamides (SAs), 9 fluoroquinolones (FQs), 7 macrolides (MCs), 3 tetracyclines (TCs), 2 chloramphenicols (CAPs), and 4 other categories, in the aquatic environment of the karst plateau wetland Caohai of the Yangtze River basin in southwestern China are reported. In total, 27 antibiotics were detected, with the detection rate ranging from 5% to 100%. The total concentration at each site ranged from 21.8 ng/L to 954 ng/L, with the average concentration being 189 ng/L. FQs and MCs were the most predominant categories, contributing 29.3% and 25.0% of the total antibiotic burden. The five most commonly detected antibiotics were ciprofloxacin (CIP), oxytetracycline (OTC), acetyl sulfamethoxazole (ASMZ), norfloxacin (NOR), and florfenicol (FF). The spatial distribution of the total concentration at each site demonstrated a decreasing trend from the southeastern area upstream adjoining the main counties to the northwestern area downstream, indicating that human activities have a great impact. Meanwhile, the natural attenuation rates of different types of antibiotics in the direction of flow ranged from 17.6% to 100%, which implied the natural purification potential of the wetland for antibiotics. The cluster analysis results indicated that domestic sewage and wastewater from agriculture and animal husbandry were the main sources of contamination in the surrounding wetland. Risk quotients (RQs) assessment showed that most of the individuals were at low to medium risk and that the adverse risks posed by mixtures of antibiotics were higher than those posed by the individual antibiotics.

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“…Previous studies have mainly focused on the total amounts of heavy metals, but their impact on the soil environment also depends on their bioavailability (Lin et al 2014, Lin et al 2022, Xian 1989). Therefore, analysing heavy metal forms is essential to more accurately and effectively re ect the degree of heavy metal pollution and their toxicity, mobility and bioavailability in the environment (Hu et al 2022, Siahcheshm et al 2022, Zhang et al 2017).…”

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confidence: 99%

Biocrusts significantly affect the bioavailability and ecological risk of heavy metals in gold mine tailings

Fan,

Bu,

et al. 2023

Plant Soil

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Aims Biocrust is an important living cover in ecologically fragile regions and an indicator of multiple heavy metal contamination. Could it be a new pathway for remediating heavy metal pollution in mine, and what are the possible repair effects and mechanisms? This study investigated the role of biocrusts in enriching or degrading heavy metals in gold mine tailings and analysed the migration, transformation mechanisms and potential toxic effects of heavy metals in underlying biocrusts.Methods The speciation of heavy metals in the underlying layer of biocrusts (moss crusts, mixed crusts (moss + algal) and algal crusts) were analysed using the BCR sequential extraction procedure. The risk assessment code (RAC) and potential ecological risk index (Er) were used to evaluate the effects of biocrusts on the ecological risk assessment of heavy metals in soil.Results Our results showed that 1) well-developed biocrusts had a strong ability to enrich heavy metals and heavy metals accumulate on the surface; 2) biocrust growth promoted the transfer of heavy metal speciation from an inert to an active form in the underlying layer, improving their bioavailability; 3) Spearman correlation and redundancy analysis (RDA) showed that the total amount of heavy metals was the driving factor of soil heavy metal translocation, with varying in uences of soil pH, cationic exchange capacity (CEC) and organic matter content (SOM); 4) the comprehensive potential ecological risk index suggested that the heavy metals in gold tailings at the strong risk levels, mainly As seriously exceeded the standard (about seven times of the background value), and biocrusts could reduce the Er of heavy metals in the underlying layer. The RAC results indicated low mobility and bioavailability of heavy metals, associated with low ecological risk.ConclusionsAs the 'skin' of soil, biocrusts could protect soil from heavy metal contamination. However, biocrust development enhanced the bioavailability of heavy metals and increased ecological risk. With low risk levels in gold tailings as the heavy metals were mainly found in the residual fraction, were stable and not easily transported. Further exploration of the in uencing mechanism of biocrusts on heavy metals will help validate their use in mine restoration processes.

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Speciation characteristics and ecological risk assessment of heavy metals in sediments from Caohai Lake, Guizhou Province

Cited by 13 publications

References 27 publications

Response of the Stability of Soil Aggregates and Erodibility to Land Use Patterns in Wetland Ecosystems of Karst Plateau

Response of the Stability of Soil Aggregates and Erodibility to Land Use Patterns in Wetland Ecosystems of Karst Plateau

Occurrence, Distribution, and Risk Assessment of Antibiotics in the Aquatic Environment of the Karst Plateau Wetland of Yangtze River Basin, Southwestern China

Biocrusts significantly affect the bioavailability and ecological risk of heavy metals in gold mine tailings

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