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 

机构地区：[1]Faculty of Regional and Environmental Sciences,Geobotany,University of Trier,Behringstraße 21,54296 Trier,Germany [2]Present address:Thünen-Institut,Institut für Waldökosysteme,Alfred-Möller-Straße 1,16225 Eberswalde,Germany [3]Departamento de Ecología de Ecosistemas,Instituto de Ecología y Biodiversidad(IEB),Alameda 340,Santiago,Chile

出　　处：《Journal of Plant Ecology》2019年第1期144-156,共13页植物生态学报（英文版）

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/.

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.

关 键 词：competition index DENDROECOLOGY growth-competition relationship pointer year productivity tree-ring analysis 

分 类 号：S71[农业科学—林学]