AM真菌和施P量对黄芩生长、养分吸收和微量元素的影响

目的:研究不同施P条件下接种AM真菌摩西球囊霉Glomus mosseae对黄芩Scuteliaria baiealensis生长、养分吸收和微量元素含量的影响.方法:采用盆栽试验与室内分析相结合的方法.结果:接种AM真菌显著提高了黄芩根系侵染率,增加黄芩干重、全磷(P)、黄芩苷、地下部全氮(N)含量,促进黄芩根系对钾(K)、钙(Ca)、镁(Mg)、铁(Fe)、锌(Zn)元素的吸收；降低了地上全N含量及氮磷比(N/P),抑制了黄芩根系对锰(Mn)、铜(Cu)元素的吸收和分配.AM真菌接种效应因施P量不同而变化,施P量为0.12～0.18 g·kg-1时接种效果最好.结论:接种AM真菌和施P之间有显著交互作用,适宜施磷水平下接种AM真菌能够显著提高黄芩产量和质量,提高P肥利用率,减少P肥施用量.

Effects of AM fungi on growth and microelement of Scuteliaria baiealensis under different applied phosphorous levels

The effects of AM fungi on the growth, nutrient uptake and microelement of Scutellaria baicalensis under different applied phosphorous levels in the pot culture were studied. The results showed that applied phosphorous levels had remarkable effect on AM fungal inoculation. Inoculation effect of AM fungi was the best under 0.12-0.18 g·kg^-1 soil. At those levels, the effect of AM fungi on the growth of S. baicalensis was the best, but either lower or higher phosphorous level showed suppressed infecting of AM fungi to S. baicalensis. After inoculation, the contents of biomass, total P, baicalin, total N of root were increased as well as the microelements of K, Ca, Mg, Fe, Zn, but the contents of total N of shoot, N/P were decreased as well as the microelements of Mn, Cu. In conclusion, the growth of host plant and using rate of phosphorus fertilizer can be promoted by inoculation of AM fungi.