A NEW CULTIVAR OF THE GENES CUNNINGHAMIA Study on Biological Characteristics of Cunninghamia laceolata(Lamb.)Hk.cv.Luotian——A Superior Variation of Cunninghamia laceolata Seasonal Variation of 13C of Four Tree Species: A Biological Integrator of Environmental Variables STARCH VARIATION DURING THE EMBRYONIC SELECTION AND EMBRYO ABORTION IN CUNNINGHAMIA LANCEOLATA Alleviation effect of exogenous Ca,P and N on the growth of Chinese fir seedlings under Al stress