丛枝菌根真菌对紫花苜蓿凋落物降解的研究

Study of arbuscular mycorrhzizal fungi on decomposition of alfalfa litter

试验采用根袋法研究了接种丛枝菌根真菌Glomus mosseae对紫花苜蓿Medicago sativa凋落物降解的影响。4、14、21和28 d后取样测定,结果表明:随时间的延长,凋落物的质量逐渐减少,接种显著提高了紫花苜蓿根系的降解速率;凋落物地上部和地下部含氮量均表现出先迅速降低后逐渐升高的趋势;凋落物地上部含磷量先上升后趋于平稳,根系含磷量则总体趋于平稳。与不接种相比,接种丛枝菌根真菌显著提高了根系含N、P量及降解系数,但对地上部的影响未达显著水平。

Litterbag was used to study the effect of arbuscular mycorrhzizal fungus Glomus mosseae to the decomposition of alfalfa（Medicago sativa）litter. Litters were embeded in the soil and sampled at 4, 14, 21 and 28 days later. Results showed that dry weights of alfalfa litters gradually reduced over times. Inoculation with arbuscular mycorrhizal fungi remarkable improved the decomposition rate of alfalfa roots. Shoot and root N concentrations showed a rapid decline and then accumulated gradually. Shoot P concentrations increased initially and maintained a relatively stable level, root P concentrations maintained at a stable level generally. Root decomposition rate, N and P concentrations of alfafa with inoculating arbuscular mycorrhizal were remarkable higher than that of non-inoculated control, but there was no significant difference in shoot.