Abstract: [Objective] Investigating the effect of aging labor force on forest land-use efficiency is to improve the productivity of forest land.[Method] Using the input-output data of 256 bamboo plots of 112 surveys from 6 administrative villages in Anji county in Zhejiang province, this paper constructed the influence path among the aging of labor force, bamboo land investment and bamboo land-use efficiency. Then, the mediating effect analysis model was used to test the rationality of influence.[Result] Not only was there direct positive effect on bamboo land-use efficiency by the aging of labor force, but also the indirect positive effect through bamboo land investment on bamboo land-use efficiency by the aging of labor force was significant. Measuring result of the influencing effects showed that the direct influence was 0.288 and mediating effect by bamboo land investment was 0.196. In control variables, significantly positive influence on bamboo land investment were found for factors such as family labor force, income ratio for bamboo production compare to total income; while the following elements showed significantly negative effects for bamboo land investment:the total area of bamboo plot, the distance to home. Health status and the years of education of labor force, income ratio for bamboo production compare to total income, and site quality of bamboo plots had significantly positive influence on bamboo land-use efficiency, and the number of bamboo plots had significantly negative influence on it.[Conclusion] The aging of rural labor force was not an obstacle to improve bamboo land-use efficiency, and aging labor force engaged in the production of bamboo increased the degree of intensification of bamboo production and improved bamboo land-use efficiency, but this advantage may be affected by the change of forestry production technology. Based on this study, some suggestions were put forward, such as improve the technology and mechanization of bamboo production, increase the human capital investment of aging labor force, accelerate the development of bamboo processing industry, and continuously improve the site quality and fragmentation of bamboo land.

Key words: aging labor force, bamboo land-use efficiency, mediating effect, Anji county