How competitive is the‘pioneer-climax’tree species Nothofagus alpina in pristine temperate forests of Chile?

作     者：Rebekka Bögelein Cecilia APérez Philipp Schäferand Frank M.Thomas 

作者机构：Faculty of Regional and Environmental SciencesGeobotanyUniversity of TrierBehringstraße 2154296 TrierGermany Present address:Thünen-InstitutInstitut für WaldökosystemeAlfred-Möller-Straße 116225 EberswaldeGermany Departamento de Ecología de EcosistemasInstituto de Ecología y Biodiversidad(IEB)Alameda 340SantiagoChile 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2019年第12卷第1期

页      面：144-156页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0829[工学-林业工程] 0901[农学-作物学] 0902[农学-园艺学] 0713[理学-生态学] 

基　　金：This work was supported by Fondo Nacional de Desarrollo Científico y Tecnológico(Fondecyt http://www.conicyt.cl/fon-decyt/) Chile Fondecyt Regular 1130353 and the International Collaboration Program DFG-Conicyt PCCI12040 http://www.conicyt.cl/pci/program-of-international-relations/. 

主　　题：competition index dendroecology growth-competition relationship pointer year productivity tree-ring analysis 

摘      要：Aims Nothofagus species are constitutive elements of the temperate forests along the Southern Andes Mountains.The deciduous Nothofagus alpina is a fast-growing,but long-lived opportunistic pioneer spe-cies(‘pioneer-climax species’)and co-occurs with the evergreen N.dombeyi.We tested whether N.alpina is competitively superior to N.dombeyi in mature stands and whether intra-specific competition in N.alpina is stronger than inter-specific competition with N.dombeyi.Methods In a pristine old-growth forest in South-Central Chile,we compared the growth of N.alpina trees in pure stands and in mixture with N.dombeyi to the growth of N.dombeyi and calculated compe-tition indices.We related growth variables to climate data and weather extremes.Important Findings In N.alpina,juvenile basal area increment was signifi-cantly higher in pure than in mixed stands.Contrary to our hypothesis,N.dombeyi exhibited larger radial stem increments than N.alpina in the most recent 40 years.In the most recent two decades,this was caused by high growth rates of large N.dombeyi trees.In both Nothofagus species,stem growth was negatively related to temperature,but N.dombeyi responded more sensitively to weather conditions than N.alpina.In N.alpina,stem increment was negatively related to the intensity of competition,but the size of the competition effects on this species was similar in pure and mixed stands.Thus,compared to N.alpina,the‘pioneer-climax species’concept is even more appropriate for N.dombeyi with its relatively high growth rates even in the early stages of its life.