摘要
The soybean is a crop which easily accumulates cadmium(Cd),which threatens human health.To assess the impact of the application of classic soil amendments on the Cd concentration in the soybean and the Cd bioavailability in the soil,a field study was conducted in Xiangtan Country(XT)and Liling City(LL),with inorganic-organic-microbial matter(T1)and silicon-calcium-magnesium oxide from natural minerals(T2)as two soil amendments in this study.The results indicated that the soil pH in the two sites increased significantly,up to 0.7~1.1 units and the Cd concentration in the stem,leaf,husk and seed in the two sites decreased differently.Of which,the soil available Cd in Xiangtan County(XT)decreased by 11.9%~16.0%,the enrichment factor(EF)and translocation factor(TF)reduced by 37.9%and 23.5%,respectively.Both soil amendments were effective in increasing the soil pH,reducing the seed and soil available Cd,but the soil organic matter,total N,stem length and grain yields decreased slightly.In conclusion,the Cd bioavailability was reduced but the soybean growth was restrained with the application of the soil amendments.
大豆是一种易吸收镉(Cd)的作物,危害人体健康。为探索典型土壤调理剂对大豆Cd含量及其土壤中Cd生物有效性的影响,以有机无机微生物复合物(T1)和硅钙镁氧化物(T2)为土壤调理剂,在湘潭和醴陵进行大田试验。结果表明:2试验点土壤pH值增加明显(P <0.05),达0.7～1.1个单位,大豆茎、叶、荚和籽粒中镉均有不同程度的降低,其中湘潭试验点土壤有效镉降低11.9%～16.0%,同时富集系数(EF)和转移系数(TF)分别降低37.9%和23.5%,差异显著(P <0.05)。2类典型土壤调理剂均能提高土壤pH值,降低土壤和种子的有效Cd含量,但土壤有机质和总氮含量、大豆株高和产量均有一定的降低。综上认为,2类典型土壤调理剂降低了镉的生物有效性,但抑制了大豆的生长。
基金
Supported by National Key Research and Development Program of China(2016YFD0300909-1,2017YFD0801005)~~
