Research Status and Methods of Natual Pruning in Forest Trees

Summarize the current research status of natural pruning, analyze the limitations of existing research, propose research methods for the natural pruning process, and provide a theoretical basis for forest nurturing and natural pruning law research. Research suggests that current studies mainly focus on the relationship between the stand structure (non-spatial structure) of artificial forests and natural pruning, as well as the influencing factors of natural pruning. There is still a lack of research on the mechanism and timing of natural pruning, and further research is needed on the natural pruning process of natural forests and the impact of spatial structure on natural pruning; lack of universal research methods and absence of indicators that characterize the natural pruning time pattern in research indicators, make it difficult to support the study of natural pruning process patterns.The 2 indicators of branch age and leaf moisture content can compensate for the shortcomings of traditional indicators and be used to study branch growth patterns and the formation and shedding times of dead branches. Analyzing the vertical structure of tree crowns, the distribution characteristics and composition ratios of different types of branches, the age and moisture content changes of different types of branches, and their relationships with natural pruning have positive significance in revealing the mechanism and timing of natural pruning.