摘要
In the present study, a pot experiment was carded out to investigate the effects of a composite soil amendment at different levels （0, 600, 900 and 1 200 mg/kg） on the soil organic matter content, pH, Pb uptake and nutritional quality of pak choi （Brassica rapa L. Chinensis Group） grown in the soils contaminated by four levels （800, 1 200, 1 600 and 2 000 mg/kg） of Pb. The results showed that 900 mg/kg soil amendment increased the soil organic matter content by 24.19%- 60.00%, but had no significant influence on soil pH. Comparing with control （without amendment application）, the security and nutritional quality of pak choi were obviously improved by applying the soil amendment. In detail, 900 mg/kg soil amendment improved the content of Vc of pak choi growing in 800, 1 200, 1 600 and 2 000 mg/kg Pb-contaminated soils by 13.27%-69.30%, the content of soluble sugar by 54.17%- 87.50%, the dry matter weight by 28.36%-33.39%, and decreased the content of Pb by 19.11%-35.72% and the content of crude fiber by 20.83%-31.03%, respectively. These data indicated that the composite amendment can be used for the in situ repair of Pb-contaminated soils, and the recommended dosage is 900 mg/kg.
该研究采用盆栽试验,以小白菜为试验材料,种植在人工配置的不同浓度(800、1 200、1 600和2 000 mg/kg)的铅污染土壤中,研究不同浓度复合改良剂(0、600、900和1 200 mg/kg)对土壤有机质、p H、小白菜可食部位铅含量和营养品质的影响。结果表明,施用900 mg/kg复合改良剂可使Pb污染土壤的有机质含量提高24.19%~60.00%,但对土壤p H值无显著影响。施用复合改良剂可明显提高小白菜安全性和营养品质,4个铅处理中小白菜可食部位铅含量降低19.11%~35.72%,Vc含量增加13.27%~69.30%,可溶性糖含量提高54.17%~87.50%,干物质量提高28.36%~33.39%,粗纤维含量降低20.83%~31.03%。因此,复合改良剂能够用于重金属铅污染土壤的原位修复,推荐其适宜用量为900 mg/kg。
基金
Supported by the Fund of Beijing Leafy Vegetables Innovation Team of Modren Agroindustry Technology Research System(BAIC07-2016)
the Fund of Beijing Municipal Commission of Rural Affairs(20120129)~~
