Short-term effects of cleaning-respacing in a silver fir-dominated stand in Romania  

作　　者：Valeriu-Norocel Nicolescu Cornelia Hernea Diana-Cristina Simon3 Matei-Nicolae Ciolan Monica-Elena Barti Hendrik Schubert Edina Borbely 

机构地区：[1]Faculty of Silviculture and Forest Engineering,Transylvania University of Brasov,.irul Beethoven 1,500123 Brasov,Romania [2]Faculty of Horticulture and Forestry,Banat’s University of Agricultural Sciences and Veterinary Medicine“King Michael I of Romania”from Timi.oara,Calea Aradului 119,300645 Timi.oara,Romania [3]Barzava Forest District,317030 Barzava,Arad,Romania [4]LIGNUM Forest District,605300 Darmanesti,Bacau,Romania

出　　处：《Journal of Forestry Research》2018年第6期1591-1599,共9页林业研究（英文版）

摘　　要：This paper discusses the early silviculture of silver fir(Abies alba Mill.), a major softwood in Romania covering more than 294,000 ha. Three research plots(DRP1, DRP2 and DRP3) were established in a 25-year-old silver fir-dominated stand in May 2012. In DRP1 and DRP2, heavy cleaning-respacing were carried out while DRP3 was kept as a control. After the treatments in 2012,the plots had stocking between 1470 trees ha-1(DRP2) and10,030 trees ha-1(DRP3), basal areas between11.8 m2ha-1(DRP2) and 31.6 m2ha-1(DRP3). The average diameters were between 5.7 cm(DRP3) and 9.6 cm(DRP2). Measurements in September 2016 confirmed the rapid response of silver fir to cleaning-respacing.The best results in average diameter increments and basal area between 2012 and 2016 were in DRP2: 3.7 cm(36.4%) and 7.7 m2ha-1(85.0%) respectively. The largest diameter trees in 2012 were the best growers, and a strong linear correlation between the initial diameter of the remaining trees and their increment was established. Natural dieback of trees occurred only in DRP3(8.6%). The selection of crop trees based on the vigour, quality, and spacing criteria during cleaning-respacing was possible as individuals stood out in terms of vigour and early diameter growth. An issue encountered in DRP1 and DRP2 was the occurrence of epicormic shoots, especially on less vigorous individuals with small crowns. However, four years after cleaning-respacing, these branches are small and do not significantly affect the wood quality.This paper discusses the early silviculture of silver fir(Abies alba Mill.), a major softwood in Romania covering more than 294,000 ha. Three research plots(DRP1, DRP2 and DRP3) were established in a 25-year-old silver fir-dominated stand in May 2012. In DRP1 and DRP2, heavy cleaning-respacing were carried out while DRP3 was kept as a control. After the treatments in 2012,the plots had stocking between 1470 trees ha^(-1)(DRP2) and10,030 trees ha^(-1)(DRP3), basal areas between11.8 m^2 ha^(-1)(DRP2) and 31.6 m^2 ha^(-1)(DRP3). The average diameters were between 5.7 cm(DRP3) and 9.6 cm(DRP2). Measurements in September 2016 confirmed the rapid response of silver fir to cleaning-respacing.The best results in average diameter increments and basal area between 2012 and 2016 were in DRP2: 3.7 cm(36.4%) and 7.7 m^2 ha^(-1)(85.0%) respectively. The largest diameter trees in 2012 were the best growers, and a strong linear correlation between the initial diameter of the remaining trees and their increment was established. Natural dieback of trees occurred only in DRP3(8.6%). The selection of crop trees based on the vigour, quality, and spacing criteria during cleaning-respacing was possible as individuals stood out in terms of vigour and early diameter growth. An issue encountered in DRP1 and DRP2 was the occurrence of epicormic shoots, especially on less vigorous individuals with small crowns. However, four years after cleaning-respacing, these branches are small and do not significantly affect the wood quality.

关 键 词：Abies alba Tending operations STOCKING Basal area INCREMENT 

分 类 号：S7[农业科学—林学]