Effects of precommercial thinning on growth parameters in Pinus nigra ***(Lamb.)Holmboe stand

作     者：Esra Bayar Ayse Deligoz Esra Bayar;Ayse Deligoz

作者机构：Department of Forestry EngineeringFaculty of ForestryIsparta University of Applied SciencesIsparta 32260Turkey 

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

年 卷 期：2020年第31卷第5期

页      面：1803-1811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：This study was a part of the doctoral dissertation and supported by Suleyman Demirel University Projects(Project numbers:OYP-05241-DR14 and 4167-OYP-D2-14) 

主　　题：Precommercial thinning Anatolian black pine Diameter increment Height increment 

摘      要：We investigated the effects of precommercial thinning(PCT)applied at different levels on the growth parameters of natural Anatolian black pine *** experimental site was located in the province of Isparta in southern *** was set up using a randomized complete block design with three replicates and three treatments(control,2–2.5 m×–2.5 m and 3–3.5 m×–3.5 m spacing).The experimental plots were established in March *** the end of the growing seasons for three years(2014–2016),growth parameters such as diameter,height and crown radius were *** was found to be significantly effective on diameter,height,individual tree basal area,and crown radius increment at the end of the third year(p0.05).While diameter,individual tree basal area and crown radius increment increased with increasing PCT intensity,height increment was higher in control than *** the PCT treatments applied with 3–3.5 m spacing affected individual tree development positively,we need long-term results on wood quality and *** to the short-term results,it is thought that it is better to lower the stand closeness gradually,so,it may be advisable to apply PCT by 2–2.5 m×–2.5 m spacing.