期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 713, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.136694
关键词
Diffusive gradients in thin-films; Ca(NO3)(2) extraction; Porewater; Bioavailability
资金
- Ministry for Primary Industries
- Fertiliser Association of New Zealand
- Manaaki Whenua - Landcare Research
- DairyNZ
- Foundation for Arable Research
- Bakers Industry Research Trust
- Flour Millers Association
- Ministry for the Environment, New Zealand
- Beef+ Lamb NZ
- Vegetables New Zealand
- Onions NZ
- Environment Canterbury
- Gisborne District Council
- Bay of Plenty Regional Council
- Waikato Regional Council
- Taranaki Regional Council
- Greater Wellington Regional Council
- Marlborough District Council
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: pseudototal 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)(2) extraction 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. (C) 2020 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据