Effect of biochar on the extractability of heavy metals (Cd, Cu, Pb, and Zn) and enzyme activity in soil

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237

作者：

Xing，Yang，Jingjing，Liu，Kim，McGrouther，Huagang，Huang，Kouping，Lu，Xi，Guo，Lizhi，He，Xiaoming，Lin，Lei，Che，Zhengqian，Ye，Hailong，Wang

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摘要：

Biochar is a carbon-rich solid material derived from the pyrolysis of agricultural and forest residual biomass. Previous studies have shown that biochar is suitable as an adsorbent for soil contaminants such as heavy metals and consequently reduces their bioavailability. However, the long-term effect of different biochars on metal extractability or soil health has not been assessed. Therefore, a 1-year incubation experiment was carried out to investigate the effect of biochar produced from bamboo and rice straw (at temperatures ≥500 °C) on the heavy metal (cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn)) extractability and enzyme activity (urease, catalase, and acid phosphatase) in a contaminated sandy loam paddy soil. Three rates (0, 1, and 5 %) and two mesh sizes (P P 2</sub>-extractable heavy metals as biochar application rate increased. The heavy metal extractability was significantly (P P

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关键词：

Application rate Bioavailability Biochar particle size Contaminated soil Heavy metal extractability Soil enzyme