Abstract

Biochar shows great potential in soil remediation. The benefits of biochar on soil depend onits intrinsic properties and soil characteristics. However, the influence of particle sizes of biochar on soil remediation is not clear. In a pot experiment, we evaluated the effects of bamboo biochar (BBC) particle sizes (P1 < 0.15 mm, 0.15 mm < P2 < 0.25 mm, 0.25 mm < P3 < 0.50 mm) on phytoremediation efficiency of Salix psammophila C. cultivated in multi-metal polluted soil. We added the BBC at 3% (w/w) in tested soil. Next, the BBC was thoroughly mixed with soil and weighting to the pot, and S. psammophila cuttings were planted and grown for six months in the amended soil under model growth condition.Results revealed the addition of different sizes of BBC particles affected soil quality, plant growth, and HMs accumulation in plants. All sizes of BBC treatments improved Cd and Zn accumulation, whereas plants in P2 treatment showed the greatest accumulation, increased by 52.41 and 25.55% compared with the control (1,503 and 19,928 μg·plant⁻¹). Overall, the results indicated BBC enhanced the phytoremediation efficiency of S. psammophila. Plants cultivated in P2 treatment showed the most significant effect on remediating contaminated soil.

摘要

生物炭在土壤修复中显示出巨大的潜力。生物炭对土壤的好处取决于其固有特性和土壤特性。但是，生物炭的粒径对土壤修复的影响尚不清楚。在盆栽实验中，我们评估了竹生物炭（BBC）粒径（P1 <0.15毫米，0.15 mm <P2 <0.25毫米，0.25 mm <P3 <0.50毫米）对在多种条件下栽培的沙柳的植物修复效率的影响。 -金属污染的土壤。我们在测试的土壤中添加了3％（w / w）的BBC 。接下来，将BBC与土壤充分混合并称重至盆栽植物和沙门氏菌在模型生长条件下，在改良土壤中种植s插并生长六个月。结果表明，添加不同大小的BBC颗粒会影响土壤质量，植物生长和植物中HMs的积累。所有大小的BBC处理均改善了Cd和Zn的积累，而P2处理的植物显示最大的积累，与对照（1,503和19,928μg·植物^-1）相比，增加了52.41和25.55％。总体而言，结果表明BBC提高了嗜肺链球菌的植物修复效率。在P2处理中种植的植物对修复受污染的土壤表现出最显着的效果。