Population structure of Araucaria angustifolia under distinct forest protection status:implications for management and conservation  

作　　者：Vinicius Costa Cysneiros Allan Libanio Pelissari Sylvio Pellico Netto Sebastiao do Amaral Machado Afonso Figueiredo Filho 

机构地区：[1]Departamento de Agricultura,Biodiversidade e Florestas,Universidade Federal de Santa Catarina-UFSC,Rodovia Ulysses Gaboardi,Km 03,Curitibanos,SC 89520-000,Brazil [2]Departamento de Ciencias Florestais,Universidade Federal do Paraná-UFPR,Av.Prof.Lothario Meissner,632,Curitiba,PR 80210-170,Brazil [3]Departamento de Engenharia Florestal,Universidade Estadual do Centro-Oeste-UNICENTRO,PR-153,Km 7,Irati,PR 84500-000,Brazil

出　　处：《Journal of Forestry Research》2023年第5期1437-1446,共10页林业研究（英文版）

基　　金：supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico–CNPq,by granting the scholarship to first author (Process:150288/2020-4)。

摘　　要：Araucaria angustifolia is the dominant coniferous species in Brazil,a long-lived pioneer species and a supplier of valuable timber and non-timber products,which gives it key-species status.This study examines how A.angustifolia population structure affects the stand structure,and whether these relationships differ between protected and unprotected areas.The study was carried out on two protection status forests(national forest and urban forest)in a region of Atlantic mixed forest in ParanáState,southern Brazil.Skewness coefficient and the Weibull shape parameter described the population structure and its effects on species diversity and biomass stock.Population diameter distribution differed significantly between forests,with unbalanced structure in both,although regeneration was more abundant in the protected area.Skewness positively affected aboveground biomass whereas shape negatively affected it and species diversity.These relationships differed between protected and unprotected stands.The effect of A.angustifolia populations on stand structure was conditioned on protection status.Old-growth populations may have lower diversity and biomass stock even supporting large trees.Consequently,old-growth forests,can lead to wood loss through mortality,senescence,and declining populations,representing the waste of a valuable timber resource.These findings provide useful knowledge for forest management,species conservation,and the carbon market.

关 键 词：Key species Diameter distribution Weibull shape parameter Aboveground biomass 

分 类 号：S791.13[农业科学—林木遗传育种]