整地与抚育对日本落叶松幼林生长的影响

The Effect of Site Preparation and Tending on Larix leplolepis Young Growth

在开原、宽甸、抚顺、清原，采用３种整地规格、２种抚育方式的２因子试验，随机区组设计日本落叶松试验林，５年研究结果：营造日本落叶松短周期工业用材林的合理整地规格以４０ｃｍ×４０ｃｍ×３０ｃｍ为佳，在幼林期树高、胸径生长量分别比２５ｃｍ×２５ｃｍ×３０ｃｍ提高了１２．６％、１５．０％；在保证林分生长良好的条件下，投入经费比６０ｃｍ×６０ｃｍ×３０ｃｍ节省了１６６～２０２元／ｈｍ２；抚育方式以造林后全面割灌第１、２年各２次，第３年１次为最好，即不影响幼林生长，又比前２年各多一次除草松土抚育方式节省投入经费１５０元／ｈｍ２。

The three sizes of site preparation and two tending manners were used for 5-year-old Larix leplolepis plantation in the areas of Kaiyuan, Kuandian, Fushun, Qingyuan of Liaoning Province. The experiment of two-factorial randomized blocks was designed for analyzing. The site preparation in size of 40×40×30 cm (length× width×depth) is reasonable for short-rotation industrial forest of L. leplolepis. In young growth period, the tree height and diameter at breast height were increased by 12.6% and 15% respectively, comparing with the site preparation in size of 25×25×30 cm. Concerning the cost, 166-202 yuan/hm 2 can be cut down , as comparing with the site preparation in size of 60×60×30 cm. Two times of tending made every year in first and second year and one time in third year presented best result. This tending way not only improved tree growth, but also reduced investment by 150 yuan (RMB) /hm 2, meanwhile, the reserve percentage is raised.