Title：
Ecological restoration of an acidic Cd contaminated soil using bamboo biochar application
Authors：
Corresponding
Author：
Ibrahim Mohamed, Guo-shi Zhang, Zhi-guo Li, Yi Liu, Fang Chen*, Ke Dai
Pubyear：
2015
Title of
Journal：
Ecological Engineering
Paper
Code：
Volume：
84
Number：
Page：
67-76
Others：
Classification：
Source：
Abstract：
Biochar is an organic amendment with good effects on soil properties but its influence on Cd fractionationand growth of vegetable crops (e.g. Chinese cabbage) and field crops (e.g. maize) is still restricted. A potexperiment was conducted to investigate the effect of biochar derived from bamboo residues (pyrolyzedat temperature of 400.C) at four levels (0%, 0.5%, 1% and 1.5%) on Cd solubility and bioavailability, andplant growth in a loamy soil artificially contaminated with Cd at three rates (0, 5 and 50 mg kg.1). Thesoil was strongly acidic (pH = 4.63) with low organic carbon content (1.064 g kg.1). Chinese cabbage andmaize were used as indicator plants in this investigation. Addition of babmboo biochar significantlyincreased soil pH, electrical conductivity (EC), organic carbon (SOC), and cation exchange capacity (CEC).Concentrations of Cd in CaCl2and DTPA extractions decreased due to the increase of biochar rates butthere were no alterations noticed in total concentrations of Cd in the soil. The acid soluble/exchangeableCd decreased by 3.35.3.88 times, but the reducible and oxidizable fractions of Cd increased by 1.95.1.96times and 1.91.2.14 times, respectively, after harvesting cabbage and maize plants in the presence of1.5% biochar. Changes of soil properties, especially pH could be used as a good reason to illustrate theimmobilization of Cd in biochar treated soils. The increase of biochar rates from 0% to 1.5% enhanced thegrowth of cabbage by 64.23%, 47.31% and 34.93%, and maize by 50.78%, 32.83% and 29.68% in soils treatedwith Cd at 0, 5 and 50 mg kg.1, respectively. Using biochar at a dose of 1.5% diminished concentrationsof Cd in cabbage shoots by 4.71.2.29 times and in maize shoots by 5.17.2.68 times, respectively. Ourresults suggested that bamboo biochar had positive residual effects on maize after the harvest of cabbage.Finally, bamboo biochar, especially at its highest rate (1.5%) could be recommended as a safe amendmentin the immobilization of Cd in contaminated agricultural soils and then reduced its threat on the foodchain and human health.
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