Accumulation and Distribution Characteristics of Rhubarb Polysaccharides in Root of Rheum palmatum L. The Localization Characteristics of Rhubarb Polysaccharide in Stems and Leaves of Rheum tanguticum Maxim.et Balf.var.liupanshanense Cheng et kao STUDY ON DISTRIBUTION LAW OF MODIFIED UREA-N IN SOIL-PLANT SYSTEM The Study of Living and Inhabiting Tunnel of Monochamus alternatus A STUDY ON FUZZY CLUSTERS AND GROWTH DOSTRIBUTION LAWS OF SEABUCKTHORN ROOTS Structures of Different Vegetative Organs of Peucedanum praeruptorum Dunn and the Distribution Law of Secretory Canals in Different Organs