Changes in foliar carbon isotope composition and seasonal stomatal conductance reveal adaptive traits in Mediterranean coppices affected by drought  

作　　者：Giovanni Di Matteo Luigi Perini Paolo Atzori Paolo De Angelis Tiziano Mei Giada Bertini Gianfranco Fabbio Giuseppe Scarascia Mugnozza 

机构地区：[1]Consiglio per la Ricerca e la sperimentazione in Agricoltura, Research Unit for Climatology and Meteorology applied to Agriculture, CRACMA, I-00186 Rome, Italy [2]University of Viterbo, Department for Innovation in Biological, Agrofood and Forest systems, DIBAF, I-01100, Viterbo, Italy [3]Ente Foreste della Sardegna, Servizio Territoriale di Cagliari, Viale Luigi Merello 86, I-09123 Cagliari, Italy [4]Consiglio per la Ricerca e la sperimentazione in Agricoltura, Forestry Research Centre, CRA-SEL, I-52100, Arezzo, Italy

出　　处：《Journal of Forestry Research》2014年第4期839-845,共7页林业研究（英文版）

基　　金：supported by the Italian Ministry for Agricultural and Forest Policy,under the programme Ri.Selv.Italia(Research unit 3.2.1,DIBAF,University of Viterbo)

摘　　要：We estimated water-use efficiency and potential photosyn- thetic assimilation of Holm oak （Quercus ilex L.） on slopes of NW and SW aspects in a replicated field test examining the effects of intensifying drought in two Mediterranean coppice forests. We used standard tech- niques for quantifying gas exchange and carbon isotopes in leaves and analyzed total chlorophyll, carotenoids and nitrogen in leaves collected from Mediterranean forests managed under the coppice system. We pos- tulated that responses to drought of coppiced trees would lead to differ- ential responses in physiological traits and that these traits could be used by foresters to adapt to predicted warming and drying in the Mediterra- nean area. We observed physiological responses of the eoppiced trees that suggested acclimation in photosynthetic potential and water-use effi- ciency： （1） a significant reduction in stomatal conductance （p〈0.01） wasrecorded as the drought increased at the SW site; （2） foliar 813C increased as drought increased at the SW site （p〈0.01）; （3） variations in levels of carotenoids and foliar nitrogen, and differences in foliar morphology were recorded, and were tentatively attributed to variation in photosyn- thetic assimilation between sites. These findings increase knowledge of the capacity for acclimation of managed forests in the Mediterranean region of Europe.We estimated water-use efficiency and potential photosyn- thetic assimilation of Holm oak （Quercus ilex L.） on slopes of NW and SW aspects in a replicated field test examining the effects of intensifying drought in two Mediterranean coppice forests. We used standard tech- niques for quantifying gas exchange and carbon isotopes in leaves and analyzed total chlorophyll, carotenoids and nitrogen in leaves collected from Mediterranean forests managed under the coppice system. We pos- tulated that responses to drought of coppiced trees would lead to differ- ential responses in physiological traits and that these traits could be used by foresters to adapt to predicted warming and drying in the Mediterra- nean area. We observed physiological responses of the eoppiced trees that suggested acclimation in photosynthetic potential and water-use effi- ciency： （1） a significant reduction in stomatal conductance （p〈0.01） wasrecorded as the drought increased at the SW site; （2） foliar 813C increased as drought increased at the SW site （p〈0.01）; （3） variations in levels of carotenoids and foliar nitrogen, and differences in foliar morphology were recorded, and were tentatively attributed to variation in photosyn- thetic assimilation between sites. These findings increase knowledge of the capacity for acclimation of managed forests in the Mediterranean region of Europe.

关 键 词：Mediterranean forest ecosystems forest acclimation stableisotopes  leaf gas exchanges water-use efficiency foliar traits adaptivesilviculture. 

分 类 号：S792.18[农业科学—林木遗传育种] S761.1[农业科学—林学]