Transpiration and growth responses by Eucalyptus species to progressive soil drying  

作　　者：Marcel Carvalho Abreu Alvaro Augusto Vieira Soares Cleverson Henrique de Freitas Fabrina Bolzan Martins 

机构地区：[1]Department of Environment Science,Forest Institute,Federal Rural University of Rio de Janeiro,Seropédica,Rio de Janeiro 23890-000,Brazil [2]Institute of Agricultural Sciences,Federal University of Uberlândia,Monte Carmelo,Minas Gerais 38405-302,Brazil [3]“Luiz de Queiroz”College of Agriculture,University of São Paulo,Piracicaba,São Paulo 13418-900,Brazil [4]Natural Resources Institute,Federal University of Itajubá,Itajubá,Minas Gerais 37500-903,Brazil

出　　处：《Journal of Forestry Research》2022年第5期1529-1543,共15页林业研究（英文版）

基　　金：This study was supported by Minas Gerais Research Founding(FAPEMIG-projects APQ-01392-13 and APQ 01,258-17).

摘　　要：The regulation of plant transpiration is a key factor affecting transpiration efficiency, growth and adaptation of Eucalyptus species to limited water availability in tropical and subtropical environments. However, few studies have related this trait to the performance of Eucalyptus seedlings and none have investigated the influence of vapor pressure deficit (VPD) on transpiration rates and growth. In this study, the transpiration and growth responses of seedlings of Eucalyptus urophylla (S.T. Blake) and Eucalyptus cloeziana (F. Muell.) to progressive soil water deficits were evaluated under semi-controlled conditions using the fraction of transpirable soil water (FTSW) method. In addition, the influence of VPD on seedling transpiration, development and growth was also investigated. The FTSW threshold ranged from 0.40 to 0.99 for the transpiration rate and from 0.32 to 0.97 for the development and growth variables. Little or no changes in the FTSW threshold were detected in response to changes in atmospheric VPD. Both Eucalyptus species presented a conservation strategy under drought stress. In addition, water-conserving mechanisms during the seedling phase were related to rapid stomatal closure, reduced leaf area, and number of leaves.

关 键 词：Soil water deficit Fraction of transpirable soil water TRANSPIRATION Seedling growth Vapor pressure deficit 

分 类 号：S792.39[农业科学—林木遗传育种]