不同锌污染水平下丛枝菌根对三叶草生长的影响

Effect of Arbuscular Mycorrhizal Infection on Growth of Red Clover at Different Levels of Zn Pollution

采用三室隔网培养方法，研究4种锌水平条件下接种菌根菌（Glomusmosseae）对三叶草生长的影响表明，施锌量对菌根侵染率、植株生长无显著影响；接种菌根菌可使植株地上部磷含量比相应的对照增加近1倍，地下部增加2倍多；随施锌量提高，接种使地上部锌含量呈下降的趋势，而地下部逐渐增加。

An investigation was carried out to test the effect of arbuscular mycorrhizal infec-tion on the growth of red clover at four Zn levels (0, 50, 100, 300 mg·kg-1 ). The plants grew in pots with sandy soil separated into three compartments by 30 μm nylon nets, a central compartmeal for root growth and two outer ones for mycorrhiza hyphal growth. Zn was applied in the central compartment inoculated or uninoculated with AM fungus (Glomus mosseae), respectively. The mycorrhizal infection and plant growth were not inhibited at the all four Zn levels used, The phosphorus nutrition of red clover was significantly improved by the mycorrhizal infection. Phosphorus concentration in shoot of mycorrhizal plants was dubled and P in the root of mycorrhizal plants was the 3-folds of that in the non-mycorrhizal plants. Consequently the plant growth was promoted significantly. The results also showed that mycorrhiza decreased Zn in shoot and increased in root with Zn levels.