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| Effects of three types of biochar on bioavailability of cadmium in a red soil and a yellow soil |
| Received:November 14, 2016 |
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| KeyWord:biochar;cadmium;bioavailability |
| Author Name | Affiliation | E-mail | | XIAO Rui-fang | College of Resources and Environment, Southwest University, the Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing 400715, China
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | | | SHEN Pu-cui | Agriculture Committee Shizhu Tujia Nationality Autonomous County, Shizhu 409100, China | | | ZHAO Xiu-lan | College of Resources and Environment, Southwest University, the Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing 400715, China
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | zxl@swu.edu.cn |
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| Abstract: |
| A pot experiment was carried out to investigate the effects of three types of biochar-peanut shell biochar (PSB), bamboo biochar (BB) and wheat straw biochar (WSB) on the bioavailability of cadmium (Cd) in a red soil and a yellow soil. The biochar was applied at the rate of 5%. The results showed that the pH values of the red soil and the yellow soil were increased by 0.12 to 0.59 unit, and 0.21 to 1.00 units, respectively, the contents of organic matter were increased by 35.43% to 83.34% and 52.14% to 142.82% respectively, but the contents of available Cd were decreased by 12.8% to 20.1% and 17.7% to 29.9%, respectively. Although the highest decrease in the available Cd content was observed in the PSB-treatment for the red soil and in the WSB-treatment for the yellow soil, there were no significant difference for soil available Cd between the two treatments. The growth of corn seedlings were, to a certain extent, inhibited by biochar application in red soil, but were promoted by application of PSB and BB in the yellow soil. The contents of Cd in the shoot of corn seedlings were decreased by 19.63% and 23.10% for the treatment of PSB and BB, respectively, in the red soil, but the Cd content in the root was increased by 14.88% for the BB treatment in the yellow soil. The other treatments had no significant influence on Cd contents in corn seedlings. Therefore, it is concluded that although the biochar could decrease the content of available Cd through increasing pH values and organic matter content of soils, the effect of biochar on Cd content in plants varies with the types of soil and biochar. |
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