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Effects of amendments on cadmium accumulation and transport and the physiological characteristics of pakchoi cabbage in cadmium-contaminated soil
Received:October 14, 2020  
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KeyWord:pakchoi cabbage;cadmium;soil physiochemical properties;absorption;transportation;physiological characteristic
Author NameAffiliationE-mail
LI Song College of Forestry, Beijing Forestry University, Beijing 100083, China  
SUN Xiang-yang College of Forestry, Beijing Forestry University, Beijing 100083, China sunxy@bjfu.edu.cn 
LI Su-yan College of Forestry, Beijing Forestry University, Beijing 100083, China  
MA Qi-xue College of Forestry, Beijing Forestry University, Beijing 100083, China  
LIU Yuan-xin College of Forestry, Beijing Forestry University, Beijing 100083, China  
ZHOU Wen-jie College of Forestry, Beijing Forestry University, Beijing 100083, China  
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Abstract:
      In order to alleviate the stress of soil cadmium pollution on pakchoi cabbage. In this study, green waste compost, biochar, and humic acid were used as composite amendments to examine the effects of different levels of addition on soil physiochemical properties and the biomass, cadmium accumulation and transportation, leaf pigment content, and physiological characteristics of pakchoi cabbage. The results showed that with an increase in the amounts of amendments applied, there were increases in soil pH and electrical conductivity values and organic matter content, whereas available cadmium content decreased. In response to amendment, there were also increases in the biomass of pakchoi cabbage roots and leaves of 46%~53% and 30%~64% respectively. Furthermore, the bioaccumulation factors of roots and leaves decreased by 12%~30% and 34%~49%, respectively, whereas although the translocation factor was significantly lower than that of the control, it was still greater than 1. In addition, the contents of chlorophyll a, total chlorophyll(a+b), and carotenoids in the leaves of pakchoi cabbage were significantly increased by the application of amendments. There were also significant reductions in the contents of malondialdehyde and proline and the activities of superoxide dismutase and peroxidase in pakchoi cabbage. In general, the application of amendments improved soil physicochemical properties, increased the biomass and leaf pigment contents of pakchoi, reduced indices of stress resistance, and significantly reduced the accumulation and transportation of cadmium in pakchoi cabbage.