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为了摸清西南桦引种驯化过程中苗木菌根存在的可能性及其对菌根的依赖程度,分别对西南桦幼苗实施VA菌根和ECM菌根的接种试验。试验结果表明:西南桦幼苗对两个类型的菌根均可受感染,对菌根均有较强的依赖性,尤以对外生菌根的依赖性较强,而对VA菌根的依赖性属中等。西南桦幼苗接种外生菌根菌后180d,平均苗高比对照增加了92.98%～106.85%,地上干质量增加206.43%～554.69%,地下干质量增加202.83%～566.40%;幼苗接种VA菌根菌后90d,苗木平均高、地上干质量及地下干质量分别比对照增加50.48%～63.41%、78.65%～151.04%和215.25%～311.86%;接种菌根的苗木可在150～180d后出圃造林,比对照苗木至少提前5个月。
In order to understand the possibility of seedling mycorrhizal and its dependence on mycorrhizal during the introduction and domestication of Betula alnoides, inoculation experiments of VA mycorrhiza and ECM mycorrhizal fungi were carried out respectively. The results showed that the seedlings of Betula alnoides were susceptible to both types of mycorrhizal fungi and had strong dependence on mycorrhizae, especially the ectomycorrhizal mycorrhizal, but their dependence on VA mycorrhizal Is medium. The average seedling height increased by 92.98% -106.85% and the ground dry weight increased by 206.43% -554.69% and the underground dry weight increased by 202.83% -566.40% at 180 days after inoculation with Ectomycorrhizal fungi. The seedlings were inoculated with VA mycorrhiza After 90 days, the average seedling height, dry weight and underground dry weight increased by 50.48% -63.41%, 78.65% -151.04% and 215.25% -111.86%, respectively. Compared with the control, seedlings inoculated with mycorrhizae could be nursery afforestation , Than the control seedlings at least 5 months in advance.