Environmental and edaphic factors affecting soil cadmium uptake by spinach, potatoes, onion and wheat.
Environmental and edaphic factors affecting soil cadmium uptake by spinach, potatoes, onion and wheat.
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DOI：
10.1016/j.scitotenv.2020.136694
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
Z. Yi;N. Lehto;B. Robinson;J. Cavanagh
中科院分区：
文献类型：
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作者：
Z. Yi;N. Lehto;B. Robinson;J. Cavanagh
农业土壤中的镉（Cd）相对容易转移到作物中，可能对消费者构成潜在的健康风险。然而，预测和减轻这些风险的努力往往受到影响可食用植物部分中金属积累的各种因素的干扰。这项工作的目的是确定关键的驱动程序，确定镉浓度在菠菜叶，马铃薯块茎，洋葱鳞茎和小麦籽粒种植在新西兰（NZ）的商业园艺业务。配对的土壤和植物样品（n = 147），收集来自不同的新西兰种植区的农场。镉的浓度在可食用的部分进行了测量，并使用四种不同的测试来研究土壤镉的潜在生物利用度：伪总和孔隙水浓度，0.05 M的Ca（NO3）2-提取和扩散梯度薄膜（DGT）。还收集了关于一系列土壤和气候变量的资料。通过考虑不同变量和农场位置的单元和多元回归分析，评估了该方法代表植物部分中Cd浓度的能力。不同试验测定的土壤Cd浓度与植物浓度呈正相关，且这些关系存在明显的区域差异。Ca（NO3）2提取预测超过76%的变异，镉浓度在洋葱鳞茎和菠菜叶，而DGT和孔隙水镉提供了最好的估计，分别为马铃薯块茎和小麦籽粒，一旦区域差异被认为是沿着一定的环境和土壤变量。结果表明，某些土壤和环境因素可以确定镉积累在一些植物的可食用部分的关键影响，区域差异是重要的调制的程度，这种情况发生。在试图减轻农业土壤中镉的潜在风险时，应考虑这些影响。
The relative ease with which cadmium (Cd) in agricultural soils can transfer to crop plants can pose a potential health risk to consumers. However, efforts to predict and mitigate these risks are often confounded by the various factors that influence metal accumulation in the edible plant parts. The aim of this work was to identify key drivers that determine Cd concentrations in spinach leaves, potato tubers, onion bulbs and wheat grain grown in commercial horticultural operations across New Zealand (NZ). Paired soil and plant samples (n = 147) were collected from farms across different NZ growing regions. Cadmium concentrations in the edible parts were measured and four different tests were used to examine the potential bioavailability of soil Cd: pseudo-total and porewater concentrations, 0.05 M Ca(NO3)2-extraction and diffusive gradients in thin-films (DGT). Information on a range of soil and climatic variables was also collected. The methods' ability to represent Cd concentrations in the plant parts was assessed through single and multiple regression analysis that considered the different variables and the farm locations. Soil Cd concentrations determined by the different tests were positively related to plant concentrations and there were clear regional differences between these relationships. The Ca(NO3)2extraction predicted over 76% of the variability in Cd concentrations in onion bulbs and spinach leaves, while DGT and porewater Cd provided the best estimates for potato tubers and wheat grains, respectively, once regional differences were considered, along with certain environmental and soil variables. The results show that certain soil and environmental factors can be a key influence for determining Cd accumulation in the edible parts of some plants and that regional differences are important for modulating the extent to which this occurs. These effects should be considered when trying to mitigate the potential risks arising from Cd in agricultural soils.