EFFECTING OF PHOTOSYNTHESIS AND WATER USE EFFICIENCY OF SMALL OLD TREE BY FERTILIZATION Discovery of an Originally Wild Tree of Eucommia ulmoides Oliver by AFLP Fingerprinting Relationship Between Vigour of Seeds and Age of Old Platycladus orientalis Study on the Sap Flow Characters of Two Old Trees of Cryptomeria fortunei on Tianmu Mountain Physiological Indexes Applied to Characterize Aging Old Trees