【摘要】 人工诱导的异龄复层阔叶红松林,通过适时上层抚育间伐,能使林分垂直结构合理,针阔比例适宜,促进各层林木生长,提高林地生产力。文章提出了首次上层抚育间伐时间、间伐方法(皆伐上层林木、择伐上层林木)、间伐季节、间伐间隔期等。对20年生林分上层抚育间伐8a后,择伐区红松胸径、树高平均生长量分别为对照区的140.6%、140.0%,皆伐区红松胸径、树高平均生长量为对照区的153.1%、170.0%。通过抚育间伐可获纯收入5921.18～7145.57元·hm-2。更多还原

【Abstract】 Tending and thinning timely in upper layers in man-made inducing unevenaged multilayered broadleaved Pinus koraiensis forests could make perpendicular structures of stands rational, proportion of coniferous and broadleaved tree species suitable, and improve growth of trees in each layers and raise productivity of forest land. In this paper, time, methods (clearcutting trees in upper layers and selective cutting trees in upper layers), seasons and intervals of tending and thinning in upper layers for the first time were put forward. After tending and thinning in upper layers in 20 aged stands were conducted 8a, average growth of DBH and height of Pinus koraiensis in selective cutting sections were 140.6% and 140.0% for that in control sections respectively, and average growth of DBH and height of Pinus koraiensis in clearcutting sections were 153.1% and 170.0% for that in control sections respectively. Pure income obtained by tending and thinning was 5921.18～7145.57 yuan RMB·hm~~-2。更多还原