College of Resources and Environment, Southwest University, Chongqing 400715, China; Centre of Atmospheric Environment Research, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
Centre of Atmospheric Environment Research, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing Botanical Garden, Mem. Sun Yat-Sen, Nanjing 210014, China.
Sci Total Environ. 2019 Mar 1;654:1364-1371. doi: 10.1016/j.scitotenv.2018.11.059. Epub 2018 Nov 7.
Soil Cd pollution resulting from human activities has become a serious food safety concern. This study was to investigate the impacts of eight soil amendments including a humic acid material (XZ), three organic-inorganic combined materials (FY, PX and PLY) and four inorganic materials (FS, LIME, PLL and PL) on soil Cd availability, enzyme activity, and the uptake by vegetables under incubation, greenhouse and field conditions. Results showed that soil exchangeable Cd (EX-Cd) concentrations under four amendments (FY, XZ, PX, FS) significantly decreased by 12.10-13.59% after 20d treatments, and both PX and PLY resulted in reduced soil EX-Cd fraction while increased fractions of Fe-Mn oxides (OX-Cd), organic matter (OM-Cd) and residual (Res-Cd) in the Cd-contaminated purple soil. PX significantly reduced soil EX-Cd and carbonate-bound (CB-Cd) fractions by 4.4% and 11.4%, and decreased vegetable Cd uptake by 38.8% and 49.1% in greenhouse and field experiments, respectively. Moreover, PX elevated the activities of soil catalase, urease and saccharase by 15.7%, 53.6% and 48.2% in pot soil, which were ~4, ~5 and ~14 times higher those in field soil, respectively. This research demonstrated that PX could be an effective soil amendment to reduce the Cd health and ecological riskthe 1s in the Cd-contaminated purple soil.
人为活动导致的土壤镉污染已成为严重的食品安全问题。本研究旨在探讨 8 种土壤改良剂（包括一种腐植酸材料[XZ]、3 种有机-无机复合材料[FY、PX 和 PLY]和 4 种无机材料[FS、石灰、PLL 和 PL]）对土壤镉有效性、酶活性以及在培养、温室和田间条件下蔬菜吸收镉的影响。结果表明，4 种改良剂（FY、XZ、PX 和 FS）处理 20d 后，土壤可交换态镉（EX-Cd）浓度分别显著降低了 12.10-13.59%，PX 和 PLY 降低了土壤 EX-Cd 分数，增加了铁锰氧化物（OX-Cd）、有机质（OM-Cd）和残渣（Res-Cd）分数。PX 显著降低了土壤 EX-Cd 和碳酸盐结合态（CB-Cd）分数，分别降低了 4.4%和 11.4%，在温室和田间试验中，蔬菜镉吸收量分别降低了 38.8%和 49.1%。此外，PX 分别提高了盆栽土壤中过氧化氢酶、脲酶和蔗糖酶的活性 15.7%、53.6%和 48.2%，分别是田间土壤的约 4 倍、5 倍和 14 倍。本研究表明，PX 可以作为一种有效的土壤改良剂，降低污染紫色土壤中镉的健康和生态风险。
