Phytotoxicity and accumulation of chromium in carrot plants and the derivation of soil thresholds for Chinese soils

文献类型： 外文期刊

第一作者： Ding, Changfeng

作者： Ding, Changfeng;Li, Xiaogang;Zhang, Taolin;Wang, Xingxiang;Ding, Changfeng;Zhang, Taolin;Wang, Xingxiang;Ma, Yibing;Wang, Xingxiang

作者机构：

关键词： Chromium;Carrot;Phytotoxicity;Accumulation;Soil thresholds

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN：

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收录情况： SCI

摘要： Soil environmental quality standards in respect of heavy metals for farmlands should be established considering both their effects on crop yield and their accumulation in the edible part. A greenhouse experiment was conducted to investigate the effects of chromium (Cr) on biomass production and Cr accumulation in carrot plants grown in a wide range of soils. The results revealed that carrot yield significantly decreased in 18 of the total 20 soils with Cr addition being the soil environmental quality standard of China. The Cr content of carrot grown in the five soils with pH > 8.0 exceeded the maximum allowable level (0.5 mg kg(-1)) according to the Chinese General Standard for Contaminants in Foods. The relationship between carrot Cr concentration and soil pH could be well fitted (R-2=0.70, P <0.0001) by a linear-linear segmented regression model. The addition of Cr to soil influenced carrot yield firstly rather than the food quality. The major soil factors controlling Cr phytotoxicity and the prediction models were further identified and developed using path analysis and stepwise multiple linear regression analysis. Soil Cr thresholds for phytotoxicity meanwhile ensuring food safety were then derived on the condition of 10 percent yield reduction. (C) 2014 Elsevier Inc. All rights reserved.

分类号： X`R12`R99

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