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目的探索川芎富集镉能力最强的生长阶段,适时降低其镉来源,以进一步降低川芎镉含量;分析施用生石灰对川芎镉富集阶段的影响。方法选取1块典型的产出高镉含量川芎的酸性地块,在川芎栽种前,向土壤施用不同剂量的生石灰,测定川芎生长周期中川芎根茎及土壤镉含量,计算川芎对镉的富集系数。结果各组川芎镉含量和富集系数的最高值出现在生长周期的第2月,之后迅速降低并保持相对平稳;相对于空白组,施用生石灰组的川芎镉含量于生长的第2月开始降低,收获期降低至最低值,并呈施用量依存性,同时,富集系数也于第2月后迅速降低,但不呈施用量依存性。结论生石灰可有效且快速的降低川芎镉含量以及川芎对镉的富集系数;川芎生长周期中除第2月镉富集系数高外,其他各月相对稳定,没有明显的富集镉能力最强的阶段。
Objective To explore the most abundant growth phase of Chuanxiong (Hibiscus maxima) enrichment of cadmium, reduce its cadmium source in time, and further reduce the content of cadmium in Chuanxiong rhizome. Analyze the effect of applying quick lime on the enrichment phase of Chuanxiong rhizome. Methods A typical acidic land with high content of Chuanxiong was selected. Before Ligusticum chuanxiong was planted, different doses of quick lime were applied to the soil. The contents of cadmium in rhizomes and soils of Ligusticum chuanxiong were determined, and the enrichment coefficient . Results The highest content of Cd and the enrichment coefficient of Chuanxiong rhizome in each group appeared in the 2nd month of the growth cycle and then decreased rapidly and remained relatively stable. Compared with the blank group, the content of Cd in Chuanxiong rhizome treated with quicklime decreased from the 2nd day of growth , The harvest decreased to the lowest, and the amount of dependence, at the same time, the enrichment coefficient also decreased rapidly after 2 months, but not the amount of dependence. Conclusions Quicklime can effectively and quickly reduce the content of cadmium in Chuanxiong and the enrichment coefficient of Chuanxiong for Chuanxiong. The growth of Chuanxiong rhizome is relatively stable in every month, except for the high Cd accumulation coefficient in the second month, The stage.