Investigation and Analysis of Keteleeria cyclolepis Community in Taining

To explore the natural growth condition and community composition of Keteleeria cyclolepis Flous，and to reveal its population structure characteristics，a study was conducted in 2023 using the method of five-point investigation to investigate the species diversity of the natural community and the growth condition of dominant species K. cyclolepis in Zhukou Township，Taining County，Fujian Province. The results showed that the K. cyclolepis community contained a total of 148 plant species，indicating high diversity. Among them，there were 78 herbaceous plant species，accounting for 52. 70%；46 shrub species，accounting for 31. 08%；and 24 tree species，accounting for 16. 22%. The average diameter at breast height (DBH) of 67 K. cyclolepis individuals was (31. 62±2. 23) cm. Apart from the maximum value(151 cm)，the overall distribution was relatively even，predominantly concentrated between 22. 3 and 36. 4 cm. The average tree height was (21. 78±0. 82) m，exhibiting significant height differentiation with a wide range，mainly concentrated between 16. 00 and 27. 00 m. The average crown width was(8. 54±0. 39) m，but with considerable variation. The maximum value (21 m) was 10. 5 times greater than the minimum value(2 m)，mainly concentrated between 6. 00 and 10. 00 m. There were a significant correlation between tree height，DBH and crown width. The correlation coefficient between DBH and tree height was 0. 416，with a correlation equation of y(Tree height)=13. 91+0. 26x(DBH)；the correlation coefficient between DBH and crown width was 0. 825，with a correlation equation of y(Chcanopy)=2+0. 21x(DBH)；and the correlation coefficient between crown width and tree height was 0. 480，with a correlation equation of y(Chcanopy)=4. 3+0. 19x(Tree height). There were very few K. cyclolepis seedlings or saplings，which had a negative impact on population renewal. Therefore，timely and appropriate pruning of the herb layer，shrub layer，and crown layer is an important approach to promote the population continuity of K. cyclolepis through artificial intervention.