Sui Fuqing, Yang Yanzheng, Wu Yong, Yan Jiali, Fu Haichao, Li Chang, Qin Shiyu, Wang Long, Zhang Wenwen, Gao Wei, Liu Hongen, Zhao Peng
Key Laboratory of Soil Pollution Control and Remediation of Henan Province, College of Resources and Environment, Henan Agricultural University, Zhengzhou 450046, China.
College of Civil and Architecture Engineering, Chuzhou University, Chuzhou 239000, China.
Toxics. 2024 Jul 24;12(8):532. doi: 10.3390/toxics12080532.
Cadmium (Cd) contamination in agricultural soils has emerged as a significant concern, particularly due to its potential impact on plant-based food. Soil pH reductions can exacerbate Cd mobility, leading to excessive accumulation in crops. While liming has been demonstrated as an effective method to mitigate Cd accumulation in rice grains in acid soils of southern China, its efficacy in remediating acid soils in northern China remains unclear. In this study, a multi-year field experiment was conducted on farmland impacted by zinc ore smelting at coordinates of 33.92° N 112.46° E to investigate the use of limestone for controlling Cd accumulation in wheat and maize grains. The results indicated that applying 7.5 t ha of limestone significantly raised the soil pH from 4.5 to 6.8 as anticipated. Different rates of limestone application (2.25, 4.45, and 7.50 t ha) reduced Cd bioavailability in the soil by 20-54%, and Cd accumulation in wheat grains by 5-38% and maize grains by 21-63%, without yield penalty. The remediation effects were sustained for at least 27 months, highlighting limestone as a promising ameliorant for smelting-affected farmland in northern China.
农业土壤中的镉（Cd）污染已成为一个重大问题，特别是因为它可能对植物性食物产生影响。土壤pH值降低会加剧镉的迁移性，导致作物中镉的过度积累。虽然在中国南方酸性土壤中，施用石灰已被证明是减轻水稻籽粒中镉积累的有效方法，但其在中国北方酸性土壤修复中的效果仍不明确。在本研究中，在北纬33.92°、东经112.46°受锌矿冶炼影响的农田上进行了一项多年田间试验，以研究使用石灰石控制小麦和玉米籽粒中镉的积累情况。结果表明，施用7.5吨/公顷的石灰石可按预期将土壤pH值从4.5显著提高到6.8。不同施用量（2.25、4.45和7.50吨/公顷）的石灰石使土壤中镉的生物有效性降低了20%-54%，小麦籽粒中镉的积累量降低了5%-38%，玉米籽粒中镉的积累量降低了21%-63%，且不会造成产量损失。修复效果至少持续了27个月，这突出表明石灰石是中国北方受冶炼影响农田的一种有前景的改良剂。
