<正>对低山丘陵地造林的7个品种楸树2年生幼树的生长和生理特性进行了研究。结果表明：不同品种楸树幼树的高生长、直径生长、叶片长宽比、单株叶片数和净光合速率等生长和生理指标存在显著差异。直径生长速率与叶长、叶片长宽比、蒸腾速率和净光合速率呈显著的正相关；叶片宽度与蒸腾速率和净光合速率呈显著的负相关；光化学猝灭qp与非光化学猝灭NPQ呈极显著的正相关，与实际光化学效率φPSⅡ呈极显著的负相关。

In recent years, more and more literatures were found in the study of mycorrhizal structures from exlemal form and anatomy structure of tissue to ultrastrncture field. The studies of ectomycorrhiza structures were reviewed ia Ibis paper. The myeorrhizal morphologies were various due to fungi, plant species and growth environment. The. type of mantle and hartig net, and the morphology of extraradical hyphae were diversity. They played important roles in nutrients absorption and exchange. Myeurrhizal formation had some impacts on the structure of host plasma membrane and cytnskeleton, while the struelure change of vacuole system in mycorrhizal fltngi also had some relationship with nutrients storage and transportation. The studies of mycorrhizat structures were helpful to understand the function mechanism nf mycorrhiza. It could provide a theoretical base hn further application of mycorrhiza.