Feng Shanshan, Zhang Peng, Hu Yanmei, Jin Feng, Liu Yuqing, Cai Shixin, Song Zijie, Zhang Xing, Nadezhda Tcyganova, Guo Zhiling, Lynch Iseult, Dang Xiuli
College of Land and Environment, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang Agricultural University, Shenyang 110866, PR China.
School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT Birmingham, UK.
NanoImpact. 2022 Oct;28:100421. doi: 10.1016/j.impact.2022.100421. Epub 2022 Aug 27.
Biochar and zeolite have been demonstrated effective to remove heavy metals in soil; however, the effect of combined application of the both materials on the fraction of Cd and soil-plant system are largely unknown. Cd fractions in soil, growth and Cd uptake of Pak Choi were measured after the combined application of biochar (0, 5, 10 and 20 g·kg) and nano-zeolite (0, 5, 10, 20 g·kg) by pot experiment. Results showed that both single and combined application reduced the exchangeable Cd in soil and improved the plant growth. However, combined application of 20 g·kg biochar with 10 g·kg nano-zeolite showed the strongest effect, with the residual Cd in soil increased by 214% as compared with control. 20 g·kg biochar with 10 g·kg nano-zeolite Mechanic studies showed that this combination enhanced the antioxidant system, with the SOD, CAT and POD activities enhanced by 56.1%, 133.3% and 235.3%, respectively. The oxidative stress was reduced correspondingly, as shown by the reduced MDA contents (by 46.7%). This combination also showed the best efficiency in regulating soil pH, organic matter and soil enzymes thus improving the plant growth. This study suggests that combined application various materials such as biochar and nano-zeolite may provide new strategies for reducing the bioavailability of Cd in soil and thus the accumulation in edible plants.
生物炭和沸石已被证明对去除土壤中的重金属有效；然而，这两种材料联合施用对镉形态及土壤-植物系统的影响在很大程度上尚不清楚。通过盆栽试验，在联合施用生物炭（0、5、10和20 g·kg）和纳米沸石（0、5、10、20 g·kg）后，测定了土壤中镉的形态、小白菜的生长情况及镉吸收量。结果表明，单独施用和联合施用均降低了土壤中可交换态镉含量，促进了植物生长。然而，20 g·kg生物炭与10 g·kg纳米沸石联合施用效果最强，与对照相比，土壤中残留镉增加了214%。20 g·kg生物炭与10 g·kg纳米沸石的机理研究表明，这种组合增强了抗氧化系统，超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）活性分别提高了56.1%、133.3%和235.3%。丙二醛（MDA）含量降低（46.7%），相应地氧化应激得到缓解。这种组合在调节土壤pH值、有机质和土壤酶方面也表现出最佳效果，从而促进了植物生长。本研究表明，生物炭和纳米沸石等多种材料联合施用可能为降低土壤中镉的生物有效性及可食植物中的镉积累提供新策略。
