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研究了ＶＡ菌根与外生菌根混合接种对毛白杨盆栽苗生长、Ｐ营养、光合及蒸腾特性的影响，并分析了原因。结果表明：在水分供给得到保证的大田条件下，菌根混合接种较单独接种更能促进宿主对Ｐ的吸收，ＶＡ菌根与外生菌根之间的负交互作用关系在毛白杨菌根混合接种苗的高生长及光合作用方面也明显地表现出来，其中在光合作用方面表现的尤为突出。就各类菌根对宿主光合作用的促进作用而言，ＶＡ菌根菌＞ＶＡ菌根菌＋外生菌根菌＞外生菌根菌；地球囊霉菌＞缩球囊霉菌＞硬皮马勃；菌根接种苗木在光合特性方面所表现出的差异主要是由其叶肉细胞在光活性方面的差异引起的；对大多数菌根接种处理来讲，苗木的光合速率与其叶绿素含量之间存在着紧密的相关关系；ＶＡ菌根及其与外生菌根混合接种均能有效地减少毛白杨苗木的光合耗水量
The effects of VA mycorrhizal and ectomycorrhizal mixed inoculation on the growth, P nutrition, photosynthesis and transpiration of potted seedlings of Populus tomentosa were studied, and the reasons were analyzed. The results showed that the mycorrhizal mixed inoculation could promote the host’s absorption of P under the field conditions of water supply assurance. The negative interaction between VA mycorrhiza and ectomycorrhiza was in the mixed culture of A. tumefaciens The high growth and photosynthesis of inoculated seedlings are also clearly demonstrated, of which the photosynthesis is particularly prominent. In terms of various kinds of mycorrhizal effect on photosynthesis of the host, VA mycorrhizal fungi> VA mycorrhizal fungi + ectomycorrhizal fungi> ectomycorrhizal fungi; Globeworms mold> Saccharomyces globosum> ; Mycorrhizal seedlings in the photosynthetic characteristics of the differences shown mainly by the mesophyll cells in the differences in the light activity caused by; for most mycorrhiza inoculation, the seedling photosynthetic rate and its chlorophyll content exists Close relationship; VA mycorrhizal and ectomycorrhizal mixed inoculation can effectively reduce the photosynthetic water consumption of Populus tomentosa seedlings