Abstract

We investigated the effects of bamboo biochar (BBC) as soil amendment on growth and phytoremediation potential of Salix psammophila in soil heavily polluted by Cd and Zn. Bamboo biochar was added to soil at ratios ranging from 1 to 7% (w/w), which significantly increased the organic matter, available potassium (K) content, while decreased the hydrolyzable nitrogen (N) content and the levels of total and bioavailable HMs in soil. The BBC amendment at ratios of 1% to 5% showed little effect on growth of plant, whereas at 7% ratio significantly decreased biomass compared to the control. BBC amendment stimulated the accumulation of Cu, Cd and Zn in plant tissues, meanwhile, Cd and Zn accumulation were more evident, especially in the BBC-3% treatment. BBC amendment improved the TF and BCF values of Cd, Zn and Cu compared to control. Higher BCF for Cd (BCF >1) and TF for Zn (TF >1) values indicate Salix psammophila have considerable potential for phytoremediation efficiency in BBC amended soil treatment. This study provides practical evidence of the efficient BBC–assisted phytoremediation capability of Salix psammophila and highlights its potential as a viable and inexpensive approach for in situ remediation.

抽象的

我们调查了竹生物炭（BBC）作为土壤改良剂对沙柳（Salix psammophila）的生长和植物修复潜力的影响镉和锌污染严重的土壤中 竹生物炭以1至7％（w / w）的比例添加到土壤中，这显着增加了有机质，有效钾（K）含量，同时降低了可水解氮（N）含量以及总和生物利用水平土壤中的HMs。比例为1％至5％的BBC修正剂对植物的生长几乎没有影响，而比例为7％时，与对照相比生物量显着降低。BBC修正刺激了植物组织中Cu，Cd和Zn的积累，而Cd和Zn的积累更为明显，尤其是在BBC-3％处理中。与对照相比，BBC修正改善了Cd，Zn和Cu的TF和BCF值。Cd（BCF> 1）的BCF较高，Zn（TF> 1）的TF较高，表明柳柳在BBC改良土壤处理中具有相当大的植物修复潜力。这项研究提供了有效的BBC辅助沙柳（Salix psammophila）植物修复能力的实践证据，并强调了其作为一种可行且便宜的原位修复方法的潜力。