Shade and sapling size influence restoration of Araucaria angustifolia  

作　　者：Simone Aparecida Zolet Sasso JoséAbramo Marchese Amanda Pacheco Cardoso Moura Bruna Valéria Gil Anelise Tessari Perboni Joel Donazzolo Fabrícia Lorrane Rodrigues Oliveira Bruno Francisco Sant’Anna-Santos Angela Rohr Moeses Andrigo Danner 

机构地区：[1]Agronomy Department,Universidade Tecnológica Federal do Paraná(UTFPR),Campus Pato Branco,Via do Conhecimento,km 01,Pato Branco,Paraná85503-390,Brazil [2]UTFPR,Campus Dois Vizinhos,Estrada para Boa Esperança,km 04,Dois Vizinhos,Paraná85660-000,Brazil [3]Biological Sciences Department,Universidade Federal do Paraná(UFPR),Avenida Coronel Francisco H.dos Santos,100,Curitiba,Paraná81531-980,Brazil

出　　处：《Journal of Forestry Research》2021年第5期1833-1841,共9页林业研究（英文版）

基　　金：financed by Brazilian agencies CAPES,FUNDAÇÃO ARAUCÁRIA and CNPq.

摘　　要：Toward improving reforestation of Brazilian pine(Araucaria angustifolia),two contrasting sapling sizes in either full sun or in the shade of a mixed plantation and the effect of opening the canopy were evaluated for survival,growth,gas exchange,photosynthetic pigments,and leaf anatomy 18 months after being planted.At 23 months after planting,a partial opening was made in the canopy in the mixed plantation,then the saplings were evaluated again after 2 months for the same morphophysiological traits.After 18 months,saplings planted in the full sun had higher survival,growth,pigments,and photosynthesis compared to the shaded saplings.Large saplings had higher survival and growth compared to the small ones.Shaded leaves were thinner and little differentiation of palisade parenchyma and hypodermis.After opening of the canopy,photo synthetically active radiation was 10 times higher,and the saplings quickly grew in height due to increased photosynthesis.Thus,although the species can tolerate shade,growth in the shade is limited.We recommend that for reforestation purposes of Brazilian pine,large saplings should be selected and planted in the open for better development.

关 键 词：Brazilian pine LUMINOSITY Gas exchanges Photosynthetic pigments Leaf anatomy 

分 类 号：S718.4[农业科学—林学]