Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; College of Tourism and Historical Culture, Liupanshui Normal University, Liupanshui 553004, People's Republic of China.
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Ecotoxicol Environ Saf. 2022 Aug;241:113733. doi: 10.1016/j.ecoenv.2022.113733. Epub 2022 Jun 8.
This study investigated the bioaccumulation and transfer of heavy metals including Cd, Cr, Cu, Mn, Ni, Pb and Zn in soil-crop system in Lhasa, and assessed the health risks of the edible part of the crops. The results showed that the average values of Cd, Cr, Cu, Mn, Ni, Pb and Zn were 0.15, 44.55, 24.68, 532.40, 22.47, 38.18 and 73.99 mg kg in natural soil, and 0.16, 46.93, 38.45, 559.13, 23.23, 40.03 and 83.29 mg kg in cultivated soil, respectively. Highland barley and wheat had the strongest ability to accumulate Zn in grain, the BCF values were 0.24 and 0.27, respectively, significant differences in the distribution of metal contents in crop root, stem, leaf and grain were observed. Root presented larger accumulation capacity in most metals, Zn and Cu was easily transferred in the plant organs, most metals in this study presented difficult to migrate from root to grain. The transfer peak of most metals in soil-crop system appeared from stem to leaf. The concentrations of Cr and Mn in crop grains could be predicted according to the multiple linear regression models. THQ and HI values of heavy metals in edible parts of both highland barley and wheat were below the safety threshold of 1, indicating no detrimental effects posed to adults health. This study helps to understand the accumulation and transfer of heavy metals in soil-crop system in plateau region.
本研究调查了拉萨土壤-作物系统中包括 Cd、Cr、Cu、Mn、Ni、Pb 和 Zn 在内的重金属的生物累积和转移，并评估了作物可食用部分的健康风险。结果表明，天然土壤中 Cd、Cr、Cu、Mn、Ni、Pb 和 Zn 的平均值分别为 0.15、44.55、24.68、532.40、22.47、38.18 和 73.99mgkg，而在耕作土壤中则分别为 0.16、46.93、38.45、559.13、23.23、40.03 和 83.29mgkg。青稞和小麦对谷物中 Zn 的累积能力最强，BCF 值分别为 0.24 和 0.27，在作物根、茎、叶和籽粒中观察到金属含量的分布有显著差异。根在大多数金属中具有较大的累积能力，Zn 和 Cu 易在植物器官中转移，本研究中的大多数金属难以从根转移到籽粒。土壤-作物系统中大多数金属的转移峰值出现在从茎到叶。可根据多元线性回归模型预测作物籽粒中 Cr 和 Mn 的浓度。青稞和小麦可食用部分中重金属的 THQ 和 HI 值均低于 1 的安全阈值，表明对成年人健康没有不利影响。本研究有助于了解高原地区土壤-作物系统中重金属的累积和转移。
