Study on Early Performance of Two Endangered Tree Species of Magnoliaceae

Base on 3-year observation on Magnolia glabrata and Michelia shiluensis in Guangzhou Preserve,this paper reports the early growing performance of the two endangeredtree species by application of Logistic formula Y=K/(1+ea-bt)(the correlation coefficient ismore than 0.90).The model of tree's growing rhythm for one year,between years and forthe fast growing period is established for demonstrating the correlation of the trees'earlygrowing performance with climatic factors and time series. The biological characteristics ofthe endangered tree species and its adaptability in Guangzhou Preserve are discussed in detail.