文章摘要
矿区砷污染土壤对生菜的生物效应研究
Bio-effects of arsenic-contaminated soil on lettuce in mining area
投稿时间:2024-03-17  修订日期:2024-04-11
DOI:
中文关键词: 矿区  砷污染  砷形态  生长抑制  BCF
英文关键词: mining area  total arsenic contamination  fractions of arsenic  growth inhibition  BCF
基金项目:国家重点研发计划(2020YFC1807804)
作者单位
王悦然 大连理工大学环境学院 
朱晓平 大连理工大学环境学院 
侯翔浩 大连理工大学环境学院 
张紫波 大连理工大学环境学院 
李兆凯 大连理工大学环境学院 
张瑛* 大连理工大学环境学院 
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中文摘要:
      土壤砷污染已引起世界范围内的广泛关注。进入土壤中的砷不仅可能导致农作物减产,还可能在作物内富集、进而威胁人类健康。为了研究矿区周边砷污染对作物的生物效应,本研究采集了广西某矿区尾矿库周边的砷污染土壤,选用生菜为受试生物进行了实验。结果表明,现场采集的土样总砷浓度为626.2 mg/kg;砷污染土壤对生菜幼苗的生长及光合作用呈现低浓度促进高浓度抑制的现象;生菜幼苗地上部分对砷的富集系数(BCF)在0.04 ~ 0.11范围内,幼苗体内的砷浓度最高达到27 mg/kg;培养28天后,生菜根际土壤中的水溶态F0、弱酸提取态F1、可还原态F2和可氧化态F3砷浓度均有显著下降,残渣态F4没有显著性变化,这说明生菜能够部分吸收根际土壤中除了F4之外的其他形态的砷, 且其对不同形态砷的吸收作用也有所不同。本研究为矿区周边砷污染的治理及农业安全提供了实验依据。
英文摘要:
      Soil pollution with arsenic has attracted increasing attention worldwide. Arsenic in soil may not only reduce crop production, but also accumulate in crops resulting further risk to crop or human health. In order to study bio-effects of arsenic from the surrounding mining area on crops, we collected arsenic-contaminated soil from tailing pond in Guangxi Zhuang Autonomous Region, and conducted experiment with lettuce model organism. Our results showed that the total arsenic concentration in the soil of field-samples was 626.2 mg/kg; the growth and photosynthesis of lettuce seedlings was promoted at low arsenic concentrations, while inhibited at high concentrations; BCF of total arsenic in aboveground tissue of lettuce seedlings ranged from 0.04 to 0.11, where the maximum arsenic concentration was 27 mg/kg; the fraction of arsenic (water-soluble fraction F0, weak acid extraction fraction F1, reducible fraction F2 and oxidizable fraction F3) in the root soil decreased significantly after 28 days of cultivation, while the residual fraction F4 did not change significantly. Our results indicated that lettuce could partially absorb all arsenic fractions in the root soil except F4, as well as different fractions could be absorbed differently. This study provided the experimental basis for the control strategy of arsenic pollution around the mining area, which established the sound basis for the agricultural safety near the arsenic-polluted area.
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