Format: ORAL

Cindy Q. Tang, Shi-Qian Yao, Jian-Ran Wen, Peng-Bin Han

Institute of Ecology and Geobotany, College of Ecology and Environmental Science, Yunnan University, Kunming, China

Our study sought to comprehensively understand Pseudotsga forestii and Pseudotsuga sinensis forests, exploring forest structure, species diversity, and regeneration characteristics. The analysis of various indices, including species richness, Simpson diversity, Pielou evenness, Shannon-Wiener diversity, and phylogenetic diversity, consistently revealed comparable values across different forest types, indicating consistent biodiversity patterns. Forests are multilayered, reaching a maximum height of 42 m and a maximum diameter at breast height (DBH) of 143 m, with an age of 570 years. The age frequency distribution exhibited a multimodal pattern, with a distinct absence of individuals in the 0-20 years age range. Seedlings and saplings were predominantly found in unstable micro-habitats. Forests undergoing moderate disturbance displayed a higher number of P. sinensis individuals younger than 30 years compared to areas with no, slight, or severe disturbance. Our findings highlight the significance of moderate disturbance in the regeneration of both P. forrestii and P. sinensis. This information provides valuable insights into the conservation strategies needed for these vulnerable coniferous species, emphasizing the importance of managing and preserving habitats with a focus on maintaining moderate disturbance levels to support their sustainable regeneration and long-term survival.