| Grafted clones of Schima superba were cultivated from 211 supper trees in more than 20 counties in Guangdong Province. The variation of seedling growth traits between provenances and clones were analyzed. It showed that the average values of annual seedling height, ground diameter and crown width were 45.57cm, 0.72cm and 30.00cm, respectively. There were significant differences between the provenances and the clones. Among them, the seedlings of the central Guangdong hilly region grew higher than other provenances. 10 clones with better growth performance were selected, and the selected gains of height, ground diameter and crown width were 58.4%, 28.5% and 42.4%, respectively. Most of the correlations among traits of the clones were above intermediate level, and the growth traits had no significant correlations with climate and geographical factors. There were significant differences in SPAD value of leaves both among provenances and clones, indicating that there were differences in chlorophyll content of leaves among different provenances and clones. SPAD value had no significant correlation with growth traits, climate and geographical factors, indicating that chlorophyll content was not affected by growth traits, climate and geographical factors. The difference of SPAD value in different parts of leaves was very significant: leaf base ＞ leaf middle＞ leaf tip. The correlation coefficients among different positions of leaves were more than 0.96, and the correlation coefficient between the mean SPAD value of leaves and of leaf middle was 0.99. It showed that leaf SPAD value could be quickly determined by measuring and analyzed the SPAD value of the leaf middle. |
