Ecological risk assessment of Cd and other heavy metals in soil-rice system in the karst areas with high geochemical background of Guangxi, China

Yang, Qiong; Yang, Zhongfang; Zhang, Qizuan; Liu, Xu; Zhuo, Xiaoxiong; Wu, Tiansheng; Wang, Lei; Wei, Xueji; Ji, Junfeng

doi:10.1007/s11430-020-9763-0

Cited by 49 publications

(26 citation statements)

References 52 publications

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“…Guangxi is located next to the southwestern border of China (104 • 26 -112 • 04 E, 20 • 54 -26 • 24 N) and encompasses a total area of 236,700 km 2 [32]. Guangxi abuts the southeastern edge of the Yungui Plateau and is bordered by Guangdong to the east, the Gulf of Tonkin to the south, and the sea surrounding Hainan and Yunnan to the west (Figure 1).…”

Section: Study Areamentioning

confidence: 99%

Landscape Pattern and Ecological Risk Assessment in Guangxi Based on Land Use Change

Yang

Chen

Lan

et al. 2022

IJERPH

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Due to ecological environmental fragility and soil erosion in Guangxi, studies of landscape patterns and associated ecological risks are needed to guide sustainable land development and ecologically sensitive land management. This study assesses dynamic spatial and temporal change patterns in land use and ecological risks based on 30 m land-use data, analyzes spatial correlations with ecological risks, and explores natural and socio-economic factor impacts on ecological risks. The results reveal: (1) A rapid and sizeable construction land increase in Guangxi from 2000 to 2018 associated mainly with loss of woodland and grassland. (2) Guangxi had the highest number of arable land patches from 2000 to 2018, and the distribution tended to be fragmented; moreover, the construction land gradually expanded outward from concentrated areas to form larger aggregates with increasing internal stability each year. (3) Guangxi ecological risk levels were low, low–medium, and medium, with significantly different spatial distributions observed for areas possessing different ecological risk levels. Regional ecological risk gradually decreased from the middle Guangxi regions to the surrounding areas and was positively correlated with spatial distribution. (4) Socio-economic factor impacts on ecological risk exceeded natural factor impacts. These results provide guidance toward achieving ecologically sensitive regional land-use management and ecological risk reduction and control, it can also provide a reference for ecological risk research in other similar regions in the world.

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Section: Study Areamentioning

confidence: 99%

Landscape Pattern and Ecological Risk Assessment in Guangxi Based on Land Use Change

Yang

Chen

Lan

et al. 2022

IJERPH

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“…In early January 2012, the Longjiang River of Guangxi was exposed to serious Cd contamination following an accident, with long-term impacts on the regional aquatic ecosystems ( Zhao et al, 2018 ; Cui et al, 2022 ). Cd is also the primary heavy metal pollutant in Chinese agricultural land, including paddy soils ( Song et al, 2019 ; Yang et al, 2021 ). Indeed, people inhabiting such areas with high levels of Cd pollution may be exposed to Cd toxicity, with potential threats to human health ( Xu et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

“…Paddy field culture is one of the major ways of mudsnail production in Guangxi. However, Cd pollution has been identified as a serious problem in Guangxi paddy soils and aquatic environments ( Zhao et al, 2018 ; Song et al, 2019 ; Yang et al, 2021 ). In addition, considering mudsnail is a benthic organism that is closely associated with paddy soil, it could be exposed to high Cd concentrations, with major threats to food safety ( Wang P. et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of cadmium exposure on intestinal microflora of Cipangopaludina cathayensis

Jiang

et al. 2022

Front. Microbiol.

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As one of the most environmentally toxic heavy metals, cadmium (Cd) has attracted the attention of researchers globally. In particular, Guangxi, a province in southwestern China, has been subjected to severe Cd pollution due to geogenic processes and anthropogenic activities. Cd can be accumulated in aquatic animals and transferred to the human body through the food chain, with potential health risks. The aim of the present study was to explore the effects of waterborne Cd exposure (0.5 mg/L and 1.5 mg/L) on the intestinal microbiota of mudsnail, Cipangopaludina cathayensis, which is favored by farmers and consumers in Guangxi. Gut bacterial community composition was investigated using high-throughput sequencing of the V3–V4 segment of the bacterial 16S rRNA gene. Our results indicated that C. cathayensis could tolerate low Cd (0.5 mg/L) stress, while Cd exposure at high doses (1.5 mg/L) exerted considerable effects on microbiota composition. At the phylum level, Proteobacteria, Bacteroidetes, and Firmicutes were the dominant phyla in the mudsnail gut microbiota. The relative abundances of Bacteroidetes increased significantly under high Cd exposure (H14) (p < 0.01), with no significant change in the low Cd exposure (L14) treatment. The dominant genera with significant differences in relative abundance were Pseudomonas, Cloacibacterium, Acinetobacter, Dechloromonas, and Rhodobacter. In addition, Cd exposure could significantly alter the pathways associated with metabolism, cellular processes, environmental information processing, genetic information processing, human diseases, and organismal systems. Notably, compared to the L14 treatment, some disease-related pathways were enriched, while some xenobiotic and organic compound biodegradation and metabolism pathways were significantly inhibited in the H14 group. Overall, Cd exposure profoundly influenced community structure and function of gut microbiota, which may in turn influence C. cathayensis gut homeostasis and health.

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“…Therefore, there is the possibility of "false positives" or "mistaken judgments" (Yu et al, 2020), leading to bias in safe utilization classification. For instance, the soil in a priority protection area may have a high ecological risk, or the strictly controlled area may squander land resources as a result of an overestimation of the soil ecological risk (Yang Q. et al, 2021;Yang Y. et al, 2021). To address this issue, the researchers proposed an improved classification scheme, which primarily incorporates crop safety status into the classification basis.…”

Section: Introductionmentioning

confidence: 99%

“…Yu et al (2020) developed a model of safe utilization classification based on the link between crop and human biomarker concentrations and crop and topsoil concentrations, which was then applied to the safe utilization of Se-rich farmland with Cd. Yang Q. et al (2021) proposed the recommended threshold values for the safe utilization and risk control of Cd in karst areas with a high geochemical background, based on the relationship between soil pH and Cd in the study area and Cd in rice particles. Li et al (2021) and Yang Y. et al (2021) proposed a farmland safe utilization scheme using the Cd concentration in topsoil and the predicted Cd concentration in crop grains.…”

Section: Introductionmentioning

confidence: 99%

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

Song

Zhang

et al. 2022

Front. Environ. Sci.

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With global urbanization and industrialization, environmental pollution and food safety problems caused by soil heavy metal pollution occur frequently. To realize the safe utilization of cultivated land resources in high-risk areas of heavy metal pollution, we present an approach to safe utilization classification and management in this study. A typical agricultural area around industrial and mining enterprises located in the economic belt of the Yangtze River Delta was chosen as the research area with cultivated soil as the research object. A total of 1,139 geochemical survey sampling sites and soil survey data were used for this research. Initially, the potential ecological risk index was used to assess the potential ecological risk of heavy metals in cultivated soil, and key soil physical and chemical indicators were chosen to assess soil resilience. Next, the safe utilization classification of cultivated land was carried out by combining the potential ecological risk of soil heavy metals with soil resilience. Then, the specific classification management strategy was developed according to ecological risk factor types and crop types. The results showed that the production and operation activities of industrial and mining enterprises in the study area contributed significantly to soil Cd and Hg pollution, and the potential ecological risk of heavy metals in the surrounding soil was high. The soil resilience of cultivated land in the study area was generally not high. The clay content and cation exchange capacity (CEC) were the main strong restrictive indicators, while CaO, soil organic carbon (SOC), and pH were the main medium restrictive indicators. Natural conditions such as topography, hydrogeology, and soil-forming parent material differed by region, resulting in different restrictive factors. There were 16 safe utilization types in the study area. Different management strategies were proposed based on various soil potential ecological risks, soil resilience, ecological risk factor types, and crop types. This study can offer fresh perspectives on the safe utilization classification and management of land resources in high-risk areas of soil pollution and serve as a reference for sustainable intensification.

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Ecological risk assessment of Cd and other heavy metals in soil-rice system in the karst areas with high geochemical background of Guangxi, China

Cited by 49 publications

References 52 publications

Landscape Pattern and Ecological Risk Assessment in Guangxi Based on Land Use Change

Landscape Pattern and Ecological Risk Assessment in Guangxi Based on Land Use Change

Effects of cadmium exposure on intestinal microflora of Cipangopaludina cathayensis

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

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