不同AMF菌剂对白三叶草坪的扶壮作用

为探讨不同丛枝菌根真菌(Arbuscular Mycorrhizal Fungi,AMF)在白三叶草坪扶壮中的作用,选用摩西球囊霉、根内球囊霉两种广适菌种,分别研究单菌、混菌对白三叶草的促进作用．结果表明:单独施加摩西球囊霉对植物的侵染率最高,达53.84％;白三叶草对混菌的依赖性最强,并且植物地上器官依赖性高于地下;AMF可明显提高白三叶草坪的扶壮率,混菌效果优于单菌,株高、地上及地下生物量的扶壮率可分别增加40.7％、76.6％、35.7％;AMF可有效增强白三叶草对根际土壤中营养物质的吸收能力,水解性氮、有效磷利用率提高51.6％、48％．水解性氮是影响AMF促进白三叶生长的主要限制因子,施加菌剂时,无需补充磷肥,但可补充少量氮肥．

Effect of different AMF microbial inoculum on the growth of Trifolium repens lawn

To explore the effect of different AMF microbial inoculum on the growth of Trifolium repens lawn,we chose two kinds of widely used strains,Glomus mosseae and Glomus intraradices,to study the promoting effect of single bacterium,mixed bacteria on Trifolium repens respectively.The results show that:Simple infliction of Glomus mosseae could obviously improve the infection rate to 53.84%;Trifolium repens has evident dependence on fungicides especially on mixed fungicides.Besides,the dependence of plant aerial parts are obviously higher than underground ones;AMF has apparent promotion on the growth rate of Trifolium repens.The mixed fungicides are better than single ones,the growth rate of plant height,the overground and underground biomass liveweight could be improved by 40.7%,76.6%,35.7% respectively;AMF could effectively enhance the Trifolium repens’ absorption capabilities of nutriment in rhizosphere soil,improve the utilization rate of hydrolysable nitrogen,available phosphorus to 51.6%,48%.Hydrolysable nitrogen is the main inhibiting factor restraining fungicide’s promotion on the growth of Trifolium repens with microbial inoculum,the phosphatic fertilizer is not needed,but a few nitrogen fertilizer is.