Production of hybrid aspen on agricultural land during one rotation in southern Sweden

作     者：Nils Fahlvik Lars Rytter Lars-Goran Stener Nils Fahlvik;Lars Rytter;Lars-Göran Stener

作者机构：The Forestry Research Institute of Sweden(Skogforsk)Ekebo 225026890 SvalovSweden 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2021年第32卷第1期

页      面：181-189页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：the Skogsssllskapet Foundation(Grant number:2018-466-Steg 22017) 

主　　题：Populus tremula×Populus tremuloides Rotation length Thinning Biomass 

摘      要：High potential productivity together with short rotation periods have made hybrid aspen an interesting option for wood production on former arable land in Nordic *** this study,some of the oldest active experimental plots with hybrid aspen in Sweden were remeasured at 23–30 years of age.A main aim was to assess age and productivity at the time of maximum mean annual volume *** addition,the infl uence of commercial thinning on stand development and diff erences in genetic gain among clones were *** from fi ve experiments in southern Sweden were used,including three genetic trials,one demonstration stand with a clone mixture and one stand regenerated from root *** three genetic trials were treated as single plot experiments,subject to a standard thinning *** the remaining experiments,diff erent thinning strategies were tested in a balanced block *** growth had culminated or was close to maximum at age 25–30 *** annual stem volume increment at culmination was 20–22 m 3 ha^−1 a^−*** height reached 30–35 m at 28–30 years of *** diameter at breast height was 27–29 cm after 29–30 years in the genetic *** ranking based on diameter at age 7–9 years was positively correlated with the ranking at the fi nal measurement in the genetic trials,20 years *** indicates that clones can be selected for superior growth based on results from young *** intense thinning programs increased the mean diameter compared to light *** study indicates that one or two early and relatively heavy thinnings can promote the development of crop trees,without jeopardizing total volume production during a rotation of 25–30 years.