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| Characteristics of cadmium uptake by rape(B. junica) grown in cadmium contaminated farmland on Chengdu Plain |
| Received:October 18, 2016 |
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| KeyWord:Chengdu Plain;cadmium;contamination;rape;uptake |
| Author Name | Affiliation | E-mail | | TIAN Xiao-qin | Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 611100, China
Provincial Key Laboratory of Water-Saving Agriculture in Hill Areas of Southern China, Chengdu 611100, China | | | LI Zhuo | Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 611100, China
Provincial Key Laboratory of Water-Saving Agriculture in Hill Areas of Southern China, Chengdu 611100, China | lizhuo_2000@sina.com | | LIU Yong-hong | Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 611100, China
Provincial Key Laboratory of Water-Saving Agriculture in Hill Areas of Southern China, Chengdu 611100, China | |
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| Abstract: |
| To understand the current situation of farmlands suffering from cadmium(Cd) contamination and that associated with Cd uptake characteristics of rape grown on Chengdu Plain, forty five soil samples were taken from the Cd contaminated farmland areas and thirty two rape cultivars were selected to study their growth and Cd uptake characteristics under soil Cd stress.The results showed that soil Cd contents in nineteen over forty five soil samples surpassed the Soil Environmental Quality Standards For Soils(Farmland Class Ⅱ). Farmlands in all the counties/cities under investigation(except Guanghan city) existed threat of Cd contamination, particularly in Shifang City. Contents of soil available Cd increased with an increase in soil total Cd and both significantly correlated with each other. On the contrary, the Cd bioavailability decreased with an increase in soil pH, showing a highly negative correlation between the two. All the rape cultivars tested showed an accumulative feature to soil Cd but the accumulative ability varied considerably among cultivars. To a given cultivar, its Cd accumulative ability mainly depended on soil total Cd contents. Several high Cd-accumulative cultivars were identified from the screening study including Lüxingyou in Deyang, 821 in Mianzhu, Deyou 5 in Pengzhou and Deyou 4 in Shifang, which are highly suitable to grow in the selected Cd contaminated areas as potential phytoremediators. Cd accumulation ability of the rape seeds was mainly affected by Cd contents in the stalk, and thus, the differences of Cd accumulation ability among cultivars depended more on stalk than on seeds. |
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