锂浓度对罗布麻生长及锂累积量的影响

锂元素是对人体有益的元素，并与罗布麻有相似药效，罗布麻中锂含量的高低决定其药效强弱。以大叶白麻和红麻为试验材料，采用盆栽试验方法研究锂浓度对罗布麻幼苗生长及锂累积的影响，并探讨其富锂极限。结果表明：锂并不是罗布麻生长的必需元素，随供应浓度增加其抑制作用愈加明显。叶片锂含量高于根和茎，且红麻叶片较大叶白麻更为耐锂。各处理相比，在锂浓度100 mg?kg^-1时，叶部锂累积量达到峰值，但生长量有限；在锂浓度为25 mg?kg^-1的条件下，虽然叶片锂累积量较100 mg?kg^-1时低，但仍高于对照，且生长量所受限制很小。综合考虑不同锂浓度对罗布麻产量及药用价值的影响，认为在种植罗布麻时，锂浓度以低于25 mg?kg^-1为宜。

Effects of Lithium Concentration Treatments on Growth of Apocynum Seedling and Its Lithium Accumulation

Apocynum and lithium have similar efficacies for human body, and a certain amount of lithium concentrates in Apocynum .The lithium content of Apocynum affects its efficacies. In this paper, WTBX]Apocynum hedersoniiWTBZ] and WTBX]A. WTBX]lancifoliumWTBZ] were chosen as the experimental materials for the pot experiments, the effects of different lithium concentrations on the seedling growth and lithium accumulation of WTBX]ApocynumWTBZ] were analyzed. Additionally, the maximum lithium accumulations of two WTBX]ApocynumWTBZ] species were also discussed. The results showed that lithium was not the necessary element for the growth of WTBX]ApocynumWTBZ], the main reason was that high lithium concentration had a restraining influence, which was increasingly apparent with the increase of lithium concentration. The lithium content of leaf was higher than that of root and stem, the leaf of WTBX]A. lancifolium WTBZ]had stronger lithium resistance than that of WTBX]A. hedersonii.WTBZ] In different treatments, the lithium accumulation of leaf reached the maximum in the treatment with the lithium concentration of 100 mg•kg-1, but its increment was limited. The lithium accumulation of leaf in the treatment of 25 mg•kg-1 was lower than that in the treatment of 100 mg•kg-1, but the former was still higher than that the controlled group and had smaller restrictions. Therefore, it is suitable for planting WTBX]ApocynumWTBZ] that the lithium concentration should be lower than 25 mg•kg-1 based on the effects of different lithium concentrations on the production of WTBX]ApocynumWTBZ] and its medicinal effects.