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VA菌根、外生菌根及菌根菌剂对马占相思和厚荚相思幼苗的接种结果表明 :VA菌根和外生菌根都可对两种相思幼苗形成侵染 ,菌根感染率达 4 9.5%～ 73.33% ;5个月后的马占相思苗木高比对照增加 53.9%～ 14 8.99% ,厚荚相思苗高增加 31.7%～ 95.39% ;马占相思生物量比对照增加 2 0 8%～ 396 % ,厚荚相思生物量增加 2 94 %～ 4 4 1.5% ;对 VA菌的菌根依赖性 (MD)测定结果表明 ,除厚荚相思对 B930 2菌株的依赖属中等外 ,两种相思对其它菌种的依赖性较强 (MD>30 0 )。在外生菌根方面 ,除厚荚相思对 992 15和 94 0 70两菌株依赖性属中等外 ,对其它菌种的依赖性均较强 ,特别是马占相思对 94 39菌株 ,其 MD值达 542 ;对 6种菌剂而言 ,以美 2菌剂效果最好 ,MD值均大大高于其它菌株。试验结果还表明 ,就两个类型菌根比较而言 ,VA菌根对苗木的促生效果优于外生菌根的效果 ;就几种菌株比较来看 ,B930 1和 B930 2两个 VA菌和 94 39、992 15及 94 0 70三个外生菌对马占相思效果好 ,而 VA菌 990 0 4、930 1和外生菌根菌 99132、94 39菌株对厚荚相思效果好 ;相思幼苗接种菌根后还有促进固氮结瘤的明显作用
The results of inoculation of VA mycorrhizal, ectomycorrhizal and mycorrhizal fungi on Acacia mangium and Acacia crassicarpa seedlings showed that both VA mycorrhizal and ectomycorrhizal fungi formed infection on two Acacia seedlings, and mycorrhizal infection rate Up to 45.5% ~ 73.33%. Acacia mangium seedlings increased 53.9% ~ 14.899% after 5 months and 31.7% ~ 95.39% higher than Acacia crassicarpa, 8% ~ 396%, Acacia crassicarpa biomass increased by 2 94% ~ 4 4 1.5%. The results of mycorrhizal dependence (MD) on VA showed that except Acacia crassicarpa was moderately dependent on B930 2, The two Acacia strains are more dependent on other species (MD> 30). In ectomycorrhizal area, Acacia meyaensis had a high reliance on other strains except 992-15 and 94 070, especially MD strain 9439, with an MD of 542; For 6 kinds of fungicides, the best effect of the United States 2 agents, MD values were significantly higher than other strains. The results also showed that, compared with the two types of mycorrhiza, VA mycorrhizal effect on the growth of seedlings is superior to the effect of ectomycorrhiza; to compare several strains, B930 1 and B930 2 VA And 94 39,992 15 and 94 0 70 three Acacia mangium acacia effect is good, and VA 990 0 4,930 1 and ectomycorrhizal 99,132,94 39 strains of acacia acacia effect is good; Acacia After inoculation mycorrhizal seedlings also promote the obvious role of nitrogen fixation