This experiment was conducted to investigate the remediation effects of bio-conditioners vermicompost (VC) and biochar (BC) on cadmium contaminated soil under the threat of acid rain, individually and associatively. With the application of soil conditioners, the percentages of HOAc-extractable Cd decreased 5.2–6.8%, 9.0–13.5% and 7.9–12.1% in the groups amended with VC, BC and VC combined BC, respectively. When the pH of rain decreased from 7.0 to 4.0, the activity of acid phosphatase decreased 2.0%, 12.3%, 3.2%, 14.8% in VC, BC, VC combined BC and control groups, individually. This study affirmed that with the application of soil conditioners, the threat of heavy metal along with bioavailability of Cd was depressed, and the properties of soil biochemical indictors were enhanced. Oppositely, the bioavailability of Cd was promoted, and soil microbial viability as well as nutrient contents was inhibited with the spraying of acid rain. The findings indicated that acid deposition played a restrain effect on soil remediation process. Meanwhile, soil conditioners showed potentials to improve soil fertilities and alleviate the stress of acid rain.

进行了该实验，以单独和关联的方式研究了生物调节剂Vercomcompost（VC）和biochar（BC）对镉污染土壤在酸雨威胁下的修复效果。随着土壤改良剂的应用，VC，BC和VC联合BC改良组中HOAc可提取Cd的百分比分别降低了5.2–6.8％，9.0–13.5％和7.9–12.1％。当雨水的pH从7.0降至4.0时，VC，BC，VC合并BC和对照组的酸性磷酸酶活性分别下降了2.0％，12.3％，3.2％，14.8％。这项研究证实，随着土壤改良剂的应用，抑制了重金属的威胁以及镉的生物利用度，并增强了土壤生化指标的性能。相反，Cd的生物利用度得到了提高，喷施酸雨抑制了土壤微生物的活力和养分含量。结果表明，酸沉降对土壤修复过程具有抑制作用。同时，土壤改良剂显示出改善土壤肥力和减轻酸雨压力的潜力。