October 18 23 the ‘detrended’ ring-widthSampling aggregateThe linearstrategies model of tree growth index
THE PRINCIPLE OFECOLOGICAL AMPLITUDEA tree species may grow and reproduce over a certain rangeof habitats; that range is described as its ecological amplitude.Trees that grow near the margins or limits of their ecologicalamplitude are o en sensitive to changes in their environment.
Average temperatures are remarkably consistent at treeline locations around the world.Source: Körner and Paulsen, Journal of Biogeography, 2004
THE LAW OF THE MINIMUM Growth is controlled by the scarcest resource (limiting factor), not the total amount of resources available
THE PRINCIPLE OFSITE SELECTIONDendrochronologists should apply the principles oflimiting factors and ecological amplitude to determinewhich trees are most likely to provide information about aspeciﬁc environmental signal.
ecotone a transitional area where one plant community changesinto another, usually caused by changes in the environment suchas changes in elevation or soil characteristics.