大田条件下成龄梨树形成的V A菌根在根皮层细胞内具有典型的泡囊和丛枝。根内和根外菌丝的直径为3.6～8.3μm、泡囊主要呈椭圆形和球形,约13×87μm。不同品种间以茌梨和黄县长把梨泡囊较多,分别为1.1和1.3个/mm 根长。黄县长把梨的丛枝着生率为2.8%,根上菌丝着生位点数0.27个/mm 根长,侵染率为17.5%,显著高于其它供试品种。不同粗度的根及不同土层内菌根的形态特征及其结构组成不同。 The V AM mycorrhizae formed by mature pear trees under field conditions showed typical vesicles and branches in the root cortex cells. The diameters of the inner and outer hyphae were 3.6 ~ 8.3μm, the vesicles were mainly oval and spherical, about 13 × 87μm. Different varieties of pear and yellow county pear pear blisters are more, respectively 1.1 and 1.3 / mm root length. Huang County chief pear pear rate of 2.8%, root mycorrhizal site number 0.27 / mm root length, the infection rate was 17.5%, significantly higher than the other varieties tested. The morphology and composition of mycorrhizal roots in different thick roots and different soil layers were different.