ABSTRACT

The focus was to assess the effects of biochar on Cd uptake by various vegetables and its downward movement in saline-alkali soil and carried out in polluted pots experiment. The results showed that the biomass of vegetables increased significantly by 16.9% to 519.9% while the Cd concentration in green pepper and eggplant fruits was decreased by 6.8% to 11.5% and 15.1% to 15.4% with the biochar application. The Cd in contaminated soil profile was transferred from topsoil (0-6 cm) to subsoil (6-12 cm) that was observed as 14.30 ± 4.17 mg kg^-1. The concentrations of Cd in soil with different fractions like exchangeable, reducible and oxidizable and the Cd uptake by vegetables were reduced. The release of residual Cd was decreased by 0.3 to 20.1% over time with biochar application (0-12 cm). The biochar was effective in mitigating the soil Cd pollution by preventing the vertical Cd leaching.

摘要

重点是评估生物炭对各种蔬菜对镉的吸收及其在盐碱土壤中的向下移动的影响，并在污染盆栽试验中进行。结果表明，使用生物炭后，蔬菜的生物量显着增加了16.9％，达到519.9％，而青椒和茄子果实中的Cd浓度分别下降了6.8％至11.5％和15.1％至15.4％。污染土壤剖面中的Cd从表土（0-6 cm）转移到地下（6-12 cm），据观察为14.30±4.17 mg kg ^-1。不同比例的土壤中可交换，可还原和可氧化的镉含量降低，蔬菜对镉的吸收减少。随着生物炭的施用（0-12厘米），残留镉的释放随时间减少了0.3％至20.1％。该生物炭通过防止垂直Cd淋溶有效减轻了土壤Cd污染。