[Pollution Evaluation and Risk Control Suggestion of Heavy Metals in Soil-crop System in Different Soil Parent Material Areas of Guangxi].

Q2 Environmental Science
Zhao-Yi Li, Han Zhao, Wei Li, Zi-Ning Zhao
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引用次数: 0

Abstract

To study the heavy metal pollution and influencing factors of soils and crops in different parent material areas and provide the basis for the classification and control of cultivated land, a total of 1 326 soil surface samples and 46 crop seed-root soil samples were collected from Xingye County in the southeast of Guangxi. The enrichment characteristics of heavy metals in the soil-crop system of four soil-forming parent materials were compared and analyzed, and the influencing factors of Cd absorption by rice were studied. The comprehensive quality impact index method was used to evaluate the soil and crops in the study area, and the safe use of cultivated land was proposed according to the evaluation results. The results showed that in the four soil-forming parent material areas, only the carbonate rock parent material area showed obvious enrichment of heavy metals in the soil, especially Cd. According to the "National Food Safety Standard for the Limit of Pollutants in Food" (GB 2762-2022), the excess rate of heavy metal Cd in rice seeds was 35.7%, and the other heavy metal rates were not exceeded. The bioconcentration coefficient of heavy metal Cd in rice from different parent material areas was as follows: quaternary sediment area > carbonate parent material area > clastic parent material area > granite parent material area. The enrichment of Cd in rice was affected by soil pH and CaO. When the soil pH value was in the range of 5.5-6.5, the Cd content and exceeding rate of rice seed increased significantly. The evaluation results of soil-crop heavy metal pollution showed that the overall heavy metal risk in the study area was high, and the proportions of clean, mild, light, moderate, and heavy pollution were 23.91%, 10.87%, 17.39%, 17.39%, and 30.43%, respectively. Combined with the distribution of the comprehensive quality influence index and the pollution characteristics of different parent materials, the classification and control suggestions were put forward, which provided ideas for the safe utilization of polluted cultivated land.

[广西不同土壤母质区土壤-作物系统重金属污染评价及风险控制建议]。
为研究不同母质区土壤和作物的重金属污染及其影响因素,为耕地重金属污染的分类调控提供依据,本研究在广西东南部兴业县采集了1 326个土壤表层样品和46个作物种子根系土壤样品。对比分析了四种成土母质土壤-作物体系中重金属的富集特征,研究了水稻吸收镉的影响因素。采用综合质量影响指数法对研究区土壤和作物进行了评价,并根据评价结果提出了耕地安全利用建议。结果表明,在四个成土母质区中,只有碳酸盐岩母质区土壤重金属富集明显,尤其是镉。根据《食品安全国家标准 食品中污染物限量》(GB 2762-2022),水稻种子中重金属镉的超标率为 35.7%,其他重金属均未超标。不同母质区水稻重金属镉的生物富集系数分别为:第四系沉积区;碳酸盐母质区;碎屑岩母质区;花岗岩母质区。水稻中镉的富集受土壤 pH 值和 CaO 的影响。当土壤 pH 值在 5.5-6.5 之间时,水稻种子的镉含量和超标率显著增加。土壤-作物重金属污染评价结果表明,研究区总体重金属风险较高,清洁、轻度、轻度、中度、重度污染比例分别为 23.91%、10.87%、17.39%、17.39%、30.43%。结合综合质量影响指数分布和不同母质的污染特征,提出了分类防治建议,为污染耕地的安全利用提供了思路。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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