Reproductive patterns in Araucaria araucana forests in the Andean range,Chile  

作　　者：Sergio Donoso Karen Peña-Rojas Claudia Espinoza Carolain Badaracco Rómulo Santelices-Moya Antonio Cabrera-Ariza 

机构地区：[1]Mediterranean Forests Laboratory,Faculty of Forestry and Nature Conservation,Avenida Santa Rosa 11315,La Pintana,Santiago,Chile [2]Centro Secano,Faculty of Agricultural and Forestry Sciences,Universidad Católica del Maule,located at Avenida San Miguel 3605,Talca,Chile [3]Maule Advanced Studies Research Center,Vice-Rector’s Office for Research and Postgraduate Studies,Catholic University of Maule,Avenida San Miguel 3605,Talca,Chile

出　　处：《Ecological Processes》2024年第1期252-261,共10页生态过程(英文)

基　　金：Uso sustentable de hojas de boldo y pinones de araucaria 052-2010 del Fondo de Investigación del Bosque Nativo(Chile)

摘　　要：Background Araucaria araucana is a mast species that presents a high variability in annual cone production.Researchers have recorded synchronization events in cone production in different populations,which allows the seed production to be concentrated,reducing the percentage of seeds consumed by different animal species.Methods We sampled three populations located in the Andes Mountains,Araucanía Region,Chile.In 2004 we began the collection of data on cone production,for which we installed permanent plots(1200 m^(2)each)at each location.We identified and labeled each female tree in each plot to monitor its cone production.In 2012 we selected a total of 30 trees near the plots to evaluate the number of seeds per cone.In each February from 2012 to 2014 we selected two mature cones and covered them with a porous mesh for subsequent collection and storage in March.At the beginning of June,we counted and weighed the seeds,determining the average weight,the number of seeds per cone,the germination capacity(GC),and the germination speed(GS).Results Cone production was synchronous across the three locations.We observed significant differences among the locations and years evaluated.The cones had fewer seeds in 2013(high production)compared to those in 2012(low production),but their weights were similar.In 2014 the cones produced smaller seeds in fewer quantities.The difference between the years 2013 and 2014 resulted from the high-energy expenditure in 2013.Regarding GC and GS,there were significant differences among the three locations(GC:F=45.41,p<0.01;GS:F=96.08,p<0.01),where the highest values were observed in 2013.Conclusions Both GC and GS are related to seed weight but not to the number of cones produced in a given year.These annual fluctuations in seed production are determining factors in the population dynamics of forest species.Our results allow a better understanding of the reproductive phenology of A.araucana and could help define sustainable use and conservation actions for this species.

关 键 词：Seed weight Germination potential Masting species Sustainable use Dioecious species 

分 类 号：Q948[生物学—植物学]