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题名: Regional accumulation characteristics of cadmium in vegetables: Influencing factors, transfer model and indication of soil threshold content
作者: Yang, Yang; Chen, Weiping; Wang, Meie; Peng, Chi
刊名: ENVIRONMENTAL POLLUTION
出版日期: 2016-12
卷号: 218, 期号:0, 页码:1036-1043
关键词: Cd-contaminated vegetables ; Environmental factors ; Plant uptake factor ; Prediction models ; Soil Cd threshold
DOI: 10.1016/j.envpol.2016.09.003
部门归属: 城市与区域生态国家重点实验室
英文摘要: A regional investigation in the Youxian prefecture, southern China, was conducted to analyze the impact of environmental factors including soil properties and irrigation in conjunction with the use of fertilizers on the accumulation of Cd in vegetables. The Cd transfer potential from soil to vegetable was provided by the plant uptake factor (PUF), which varied by three orders of magnitude and was described by a Gaussian distribution model. The soil pH, content of soil organic matter (SOM), concentrations of Zn in the soil, pH of irrigation water and nitrogenous fertilizers contributed significantly to the PUF variations. A path model analysis, however, revealed the principal control of the PUF values resulted from the soil pH, soil Zn concentrations and SOM. Transfer functions were developed using the total soil Cd concentrations, soil pH, and SOM. They explained 56% of the variance for all samples irrespective of the vegetable genotypes. The transfer functions predicted the probability of exceeding China food safety standard concentrations for Cd in four major consumable vegetables under different soil conditions. Poor production practices in the study area involved usage of soil with pH values <= 5.5, especially for the cultivation of Raphanus sativus L, even with soil Cd concentrations below the China soil quality standard. We found the soil standard Cd concentrations for cultivating vegetables was not strict enough for strongly acidic (pH <= 5.5) and SOM-poor (SOM <= 10 g kg(-1)) soils present in southern China. It is thus necessary to address the effect of environmental variables to generate a suitable Cd threshold for cultivated soils. (C) 2016 Elsevier Ltd. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35650
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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Recommended Citation:
Yang, Yang,Chen, Weiping,Wang, Meie,et al. Regional accumulation characteristics of cadmium in vegetables: Influencing factors, transfer model and indication of soil threshold content[J]. ENVIRONMENTAL POLLUTION,2016,218(0):1036-1043.
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