钝化剂与肥料对油菜和孔雀草间作体系的影响

通过盆栽实验，采用镉（Cd）低积累油菜单作和低积累油菜-超富集植物孔雀草间作两种种植模式，设置施用巯基坡缕石和硫酸钾以及叶面喷施硫酸锰的调控处理，研究不同处理对单作和间作模式下植物生长与Cd累积以及土壤Cd形态的影响.结果表明：施用巯基坡缕石可显著降低油菜和孔雀草地上部Cd含量、油菜Cd累积量、Cd提取率以及土壤有效态Cd含量.施用0.4g/kg的硫酸钾显著增加孔雀草Cd累积量，降低间作油菜地上部Cd含量，使间作油菜根际土壤可交换态Cd比例减少，残渣态Cd比例增加.喷施0.6g/L的硫酸锰使单作油菜地上部Cd含量、Cd累积量以及Cd提取率显著降低.从降低油菜地上部Cd含量保障安全生产，同时不影响Cd植物提取修复角度综合考虑，在间作模式下，施用0.4g/kg的硫酸钾处理调控效果最佳.

Effects of immobilization agent and fertilizers on the intercropping system Brassica chinenesis and Tagetes patula

A pot experiment was conducted to investigate the effects of mercapto-modified palygorskite (MPAL), K₂SO₄, and foliar spraying with MnSO₄ on the biomass and Cd accumulation in the plants and Cd fractions in soils under the mode of monoculture of low-Cd accumulating cultivar of Brassica chinenesis L., and intercropped B. chinensis and Cd hyperaccumulator Tagetes patula L. The results showed that MPAL significantly reduced Cd concentrations in the shoots of B. chinenesis and T. patula, Cd accumulation in the shoot of B. chinensis, Cd extraction ratio (CER), and available Cd in the soil. Addition of K₂SO₄ with 0.4g/kg significantly increased Cd accumulation in the shoot of T. patula, while it reduced Cd uptake in the shoot of B. chinensis. Meanwhile, in the intercropped systems the percentage of exchangeable Cd fraction in the rhizosphere soil was decreased, and the ratio of residual Cd fraction was on the contrary. Foliar spraying with 0.6g/L MnSO₄ could significantly inhibit Cd concentration, Cd accumulation and CER in the shoot of B. chinensis under the monoculture treatment. In view of reducing Cd uptake and ensuring quality and safety of B. chinenesis, and meanwhile it did not affect CER, the addition of 0.4g/kg K₂SO₄ was recommended for the intercropping system of B. chinenesis and T. patula.