Growth and chemical composition of silver birch:Comparative study between Lithuania and Romania  

作　　者：Valda Araminienė Lucian Dinca Iveta Varnagirytė-Kabašinskiene Raluca Enescu Vlad Crisan Vidas Stakėnas 

机构地区：[1]Institute of Forestry,Lithuanian Research Centre for Agriculture and Forestry,Liepųstr.1 Girionys,53101 Kaunas district,Lithuania [2]The National Institute for Research and Development in Forestry“Marin Drăcea”,Closca str.13,Brasov,Romania

出　　处：《Journal of Forestry Research》2021年第5期2111-2120,共10页林业研究（英文版）

基　　金：supported financially by Agency for Science;Innovation and Technology,Lithuania。

摘　　要：The effects of different climatic conditions on growth and chemical composition of Betula pendula in geographically different European regions,Lithuania and Romania,were compared.Birch species in the entire area have a wide natural distribution,but B.pendula is commercially more important in Lithuania than in Romania.Here we evaluated tree ring width,wood density and foliar chemical composition of mature birch trees in two European regions.Trees at the Lithuanian sites had greater radial growth and wood density with no clear changes in foliar chemistry than those at the Romanian sites.Mean wood density was 600-700 kg m^(-3) at Lithuanian and 350-450 kg m^(-3) at Romanian sites.Mean width of wood ring,earlywood and latewood for Lithuanian birch trees were several times higher than the means for Romanian birch trees.We hypothesized that the main differences in birch radial growth and wood density were due to the different climatic conditions in the studied regions.Ca,K and Mg concentrations were significantly higher and Fe and Mn were lower in the birch foliage at the Lithuanian sites compared those at the Romanian sites.Overall assessment of growth showed that silver birch cultivation is more appropriate for colder climate regions and that birch growth may change in the context of a warming climate.

关 键 词：Betula pendula Ring width Ood density Foliage chemistry 

分 类 号：S792.153[农业科学—林木遗传育种]