Study on the growth rhythm of Tapiseia siriensis at seedling stage

Taking the Tapiseia siriensis introduced from the Wufeng county Yichang city as materials，we surveyed the seedling height，ground diameter and leaf growth in different months at the Longyuan nursery of Yanling county，analyzed their growth rhythm，and then fit the growth process of seedlings by using Logistic curve and S curve. The result showed that the height and ground diameter showed“ S” curves in the whole process of seedling growth. The fast growth period of plant height started from June to July，accounting for 25.2% of the total annual growth，whereas the fast growth period of plant ground diameter started from August to September，accounting for 27.2% of the total annual growth. Compared to the S curve，Logistic curve was better suited for describing the growth of height and ground diameter. The seedling growth could be well predicted by the fitting curves，thus providing reference for seedling nursery and landscape application．