ECO-Environment Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Shanghai Environmental Protection Monitoring Station of Agriculture, Shanghai 201403, China.
Int J Environ Res Public Health. 2022 Jan 22;19(3):1210. doi: 10.3390/ijerph19031210.
Exploring ways to reduce the risk of heavy metal pollution by organic fertilizer application is of vital importance. In the present study, by conducting a pot experiment, natural zeolite was applied together with pig manure based organic fertilizer to agricultural soil in order to test its possibility of reducing the risk of heavy metals originating from pig manure. The results showed that a low rate of organic fertilizer (10%) application increased the biomass of Chinese cabbage (by 57.2%), while a high rate of organic fertilizer (30%) decreased the biomass of Chinese cabbage (by 46.16%), and meanwhile a 3% zeolite addition increased the biomass of Chinese cabbage which was treated with 30% organic fertilizer. The organic fertilizer addition decreased soil pH and increased soil CEC, while zeolite addition increased soil pH and decreased the soil organic matter content. The concentration of Zn in Chinese cabbage shoots increased with the organic fertilizer addition from 4.46% to 48.27%, while the addition of 1% and 3% zeolite significantly decreased Zn in Chinese cabbage shoots by 15.53% and 14.08%, respectively. The concentration of DPTA-extractable and DGT-extractable Zn of soil was increased by organic fertilizer application, whereas zeolite addition decreased the concentration of DPTA-extractable and DGT-extractable Zn in soil treated with organic fertilizer. Our present study suggests that natural zeolite application could be a promising method to reduce the risk of heavy metals originating from organic fertilizers.
探索通过施用有机肥减少重金属污染风险的方法至关重要。本研究通过盆栽试验，将天然沸石与猪粪有机肥一起应用于农业土壤，以检验其降低猪粪源重金属风险的可能性。结果表明，低用量有机肥（10%）增加了小白菜的生物量（增加了 57.2%），而高用量有机肥（30%）降低了小白菜的生物量（降低了 46.16%），同时添加 3%沸石增加了用 30%有机肥处理的小白菜的生物量。有机肥的添加降低了土壤 pH 值，增加了土壤 CEC，而沸石的添加则增加了土壤 pH 值，降低了土壤有机质含量。小白菜地上部 Zn 浓度随有机肥用量从 4.46%增加到 48.27%，添加 1%和 3%沸石可分别使小白菜地上部 Zn 浓度降低 15.53%和 14.08%。土壤中 DPTA 可提取态和 DGT 可提取态 Zn 的浓度随有机肥用量的增加而增加，而沸石的添加则降低了有机肥处理土壤中 DPTA 可提取态和 DGT 可提取态 Zn 的浓度。本研究表明，天然沸石的应用可能是降低有机肥源重金属风险的一种有前途的方法。
