Biological characters of root, root nodules, stem, leaves, flower, fruit, seed, seedling and shoot growth length and vigor, fruit seting and yield, chlorophyll contents in leaves, photosynthetic and respiration rate of leaves, fruit development, and change of static state and trends of fruit nutrition components of three seabuckthorn cultivars (China seabuckthorn, Russia seabuckthorn and Mongolia seabuckthorn) from Hippophae rhamnoides L. which were planted at the same ecological condition were s...