School of Food Science and Technology, Foshan University, Foshan, Guangdong 528231, China; School of the Environment, Natural Resources & Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK; Key Laboratory of Agro-environments in Tropics, Chinese Ministry of Agriculture, Guangzhou, Guangdong 510642, China.
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A & F University, Hangzhou, Zhejiang 311300, China; Zhejiang Chengbang Landscape Co. Ltd., Hangzhou, 310008, China.
Chemosphere. 2018 Jun;200:274-282. doi: 10.1016/j.chemosphere.2018.02.134. Epub 2018 Feb 22.
In the current study, we conducted a field experiment using the test plant, Brassica chinesis L. (pak choi), to investigate the effect of sugarcane bagasse-derived biochar on the bioavailability of cadmium (Cd), copper (Cu) and lead (Pb), and the health of soil microbiota in a contaminated soil. Biochar application significantly (P < 0.05) increased pak choi yield. Bioavailability of heavy metals to plant shoots and roots decreased with increasing biochar application rates (at 0, 1.5, 2.25 and 3.0 t ha). Sequential extraction of the biochar-treated and -untreated soil revealed that exchangeable Cd reduced whereas organically-bound fraction increased with increasing biochar rate. The labile fractions of Cu and Pb decreased, but the residual fraction increased in biochar-treated soils compared to the control. Urease, catalase and invertase activities, and the populations of bacteria and actinomycetes were significantly enhanced, whereas fungi population declined in biochar-treated soils. This study highlights that sugarcane bagasse biochar has the potential to support the remediation of soils contaminated with heavy metals, and as such can improve the yield and quality of agricultural crops.
在本研究中，我们使用芥菜（白菜）作为测试植物进行田间实验，以研究甘蔗渣衍生生物炭对污染土壤中镉（Cd）、铜（Cu）和铅（Pb）生物有效性以及土壤微生物群落健康的影响。生物炭的应用显著（P < 0.05）增加了白菜的产量。重金属对植物地上部和根部的生物有效性随生物炭施用量的增加而降低（在 0、1.5、2.25 和 3.0 t ha 时）。生物炭处理和未处理土壤的连续提取表明，可交换态 Cd 减少，而有机结合态 Cd 增加。与对照相比，生物炭处理土壤中 Cu 和 Pb 的活性部分减少，而残留部分增加。脲酶、过氧化氢酶和转化酶活性以及细菌和放线菌的数量显著增加，而真菌数量则减少。本研究强调了甘蔗渣生物炭具有支持重金属污染土壤修复的潜力，从而可以提高农业作物的产量和质量。
