Zinc (Zn) immobilization by two distinct biochars in soil, together with concomitant alleviation of phytotoxic responses in Ficus elastica Roxb. ex Hornem., were examined. Rooted cuttings of F. elastica were grown in 880 mg kg^− 1 Zn-spiked sandy soil amended with grain husk (GH) or cattle manure (CM) biochar at 0, 10, 30 and 50 g kg^− 1 soil for a period of 6 months. Addition of both GH and CM biochars had significant positive impacts on physiological parameters such as plant growth, leaf relative water content, photosynthetic pigments and leaf gas exchange characteristics. The responses to addition of CM biochar were significantly better than to GH biochar. Lipid peroxidation declined in leaves of plants grown in Zn-contaminated, biochar-amended soil. This was confirmed by luminescence and Fourier transform infrared analysis of the leaf material. Biochar significantly reduced the availability of soil Zn, as evidenced by lower concentrations of Zn in leaves and leachates of biochar treated plants relative to control plants. These findings show that biochar can effectively immobilize soil Zn, and as a result, alleviate Zn phytotoxicity by reducing its uptake and accumulation in the plant. Adding biochar to soils contaminated with metals thus holds promise as a means of restoring blighted lands.

在土壤中通过两种不同的生物炭固定锌（Zn），同时减轻弹性榕树的植物毒性反应。前霍纳姆。，进行了检查。在880 mg kg ^{− 1}掺有谷壳（GH）或牛粪（CM）生物炭的Zn掺入的沙质土壤中以0、10、30和50 g kg ^{− 1}种植有弹性的根状s插。土壤为期6个月。GH和CM生物炭的加入对生理参数（例如植物生长，叶片相对含水量，光合色素和叶片气体交换特性）具有显着的积极影响。添加CM生物炭的反应明显好于GH生物炭。在受锌污染，生物炭改良过的土壤中生长的植物叶片中的脂质过氧化作用下降。叶材料的发光和傅立叶变换红外分析证实了这一点。生物炭显着降低了土壤锌的利用率，这是通过生物炭处理过的植物的叶子和沥出液中的锌相对于对照植物较低的浓度所证明的。这些发现表明，生物炭可以有效地固定土壤中的锌，因此，通过减少锌在植物中的吸收和积累来减轻锌的植物毒性。因此，将生物炭添加到被金属污染的土壤中有望成为恢复枯萎土地的一种手段。