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Internal and external nutrient cyclings ot poplar tree Ⅰ. Changes of nutrient storage in different parts of poplar tree before and after leaf fallen A Study on Catalpol Content Changes in Rehmannia glutinosa (Gaertn.)Libosch. under Certain Conditions Study on optimization of drying method and its mechanism in Ginkgo biloba leaves Localization and Dynamic Change of Saikosaponin in Root of Bupleurum chinense DC. Dynamic Changes of Endogenous Hormones in Lateral Buds of Populus yunnanensis during Different Seasons