杉木无节良材培育中修枝工具的评价与研发OA北大核心CHSSCDCSCD

Chinese fir pruning is a key technique for producing knot-free timber.To systematically evaluate the pruning effects of the conventional pruning tools used for Chinese fir plantation management and develop more efficient and safer specialized tools to enhance the quality and efficiency of the pruning operation,this study conducts on-site trial use and effect evaluations of three types of conventional pruning tools for Chinese fir forests of different ages and different afforestation densities in Yong'an State-owned Forest Farm,Fujian Province,and develops three new types of pruning tools specifically.The evaluation results show that for pruning operations at heights less than 2.0 m,it is recommended to use hand-held electric pruning shears or hand-held triangular saws;in the height range of 2.0 to 3.5 m,electric pole pruners have better performance;in the 3.5 to 6.0 m range,manual pole pruners are more operable.In response to the limitations of conventional pruning tools,the newly developed manual pruning snap ring can quickly determine the height where the tree trunk should be pruned.The electric pruning snap ring can measure the trunk diameter in real time and mark the pruning height on the tree trunk.The electric pruning shears equipped with a trunk stabilization ring can effectively increase work efficiency by 1-2 times and improve cut quality by over 30％.Additionally,by extending the pruning height to 5 meters or more using a threaded rod,operators can avoid aerial work,thus solving the problem of poor stability and controllability during high-altitude pruning and providing reliable technical support for the precise pruning for knot-free timber production.This paper reveals that conventional pruning tools generally have problems such as insufficient specialization,low pruning height,and suboptimal pruning performance.It also proposes that future pruning tools for plantations should be toward lightweight,precision,and intelligence to improve plantation cultivation technology.