Distinct responses of climate-growth and iWUE in Fagus sylvatica L.at two low elevation sites in southern Italy  

作　　者：Jerzy Piotr Kabala Francesco Niccoli Simona Altieri Iqra Liyaqat Giovanna Battipaglia 

机构地区：[1]Department of Environmental,Biological and Pharmaceutical Sciences and Technologies,University of Campania Luigi Vanvitelli,Via Vivaldi No.43,81100 Caserta,Italy

出　　处：《Journal of Forestry Research》2025年第1期275-291,共17页林业研究(英文版)

摘　　要：In this study,using a dendrological and isotopic approaches,we investigated the responses to climate of two pure Fagus sylvatica L.stands(Campobraca and Falode)in the southernmost part of the distribution range in southern Italy.Theδ^(13)C data were used for calculating the intrinsic water use efficiency(iWUE)as a proxy of the balance between the water and carbon cycles.The results showed that the iWUE of both stands was sensitive to the amount of precipitation during the summer months(negative,significant effect)and to atmospheric CO_(2)concentration.Growth was sensitive to climate only in the Campo Braca site;the most influential variables were the VPD(vapour pressure deficit)and precipitation of the summer months that had a negative and a positive effect,respectively.The iWUE showed a negative correlation with growth in Campo Braca and a non-significant one in Falode.Water availability was the most influential variable on F.sylvatica growth and physiology.The iWUE increase was mainly driven by atmospheric CO_(2)concentration,and by decreased precipitation,as a response of the trees to drought.Our results highlight the importance of understanding the hydrological changes due to climate change for forecasting/modelling forest responses.CO_(2)increase does not compensate for the effect of adverse climate on F.sylvatica in the forests of southern Italy,while local conditions play an important role in determining tree growth.

关 键 词：Intrinsic water use efficiency Tree rings Stable isotope analysis Climate change European beech 

分 类 号：P46[天文地球—大气科学及气象学]