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| Effects of biochar and pig manure on ipomoea aquatica forsk growth and copper forms in copper-polluted soil |
| Received:November 06, 2015 |
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| KeyWord:Cu-polluted soil;Ipomoea aquatica Forsk;biochar;Cu-containing pig manure;chemical form |
| Author Name | Affiliation | E-mail | | CHEN Xuan | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | GUO Xiong-fei | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | CHEN Gui-kui | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | | | LI Hua-shou | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | lihuashou@scau.edu.cn | | HE Hong-zhi | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China
Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, China | |
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| Abstract: |
| A pot-culture experiment was carried out to compare the effects of biochar, copper(Cu)-containing pig manure, and their mixture on Ipomoea aquatica growth as well as the changes of total copper and various chemical forms in soil. Five chemical fractions of copper in soil were analyzed with Tessier sequential extraction procedure. Results showed that applications of pig manure promoted plant growth, and Cu absorption and accumulation of I. aquatica. Compared with the control, biochar amendments remarkably reduced I. aquatica biomass and soil exchangeable Cu concentrations, but increased soil residual Cu content. In control soil(0 mg Cu·kg-1 addition), the percentages of various chemical forms of copper was organic>Fe-Mn oxides-bound>carbonate-bound>exchangeable forms. Adding pig manure significantly increased exchangeable Cu and organic Cu, while biochar applications increased organic Cu form gradually. Applying mixture of biochar and pig manure increased carbonate-bound Cu and organic Cu. Although applications of biochar reduced the biomass of I. aquatica, but promoted Cu immobilization in soil. |
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