Research on Drought Resistance Mechanism to Different Mycorrhizal Seedlings of Ostyopsis davidiana Studies on Microspores Development and Male Gametophytes Formation of Ostryopsis davidiana Decne. Mycorrhiza of Cenococcum geophilum(Fr.) Formed on Ostryopsis daidiana and Mycorrhizal Affection on the Growth of Ostryopsis davidiana Rhizosphere Fungi of Ostryopsis davidiana and the Allelopathic Effects on Piuns tabulaeformis Origin of Ostryopsis intermedia (Betulaceae) in the southeast Qinghai–Tibet Plateau through hybrid speciation Morphogenesis of Female Reproductive Organs in Carpinus turczaninowii and Ostryopsis davidiana (Betulaceae) Chemical constituents in leaves of Ostryopsis nobilis and their anti-oxidant activities