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NOTE TO READERS You may notice that the principles below represent a major change in the way we approach dendrochronology.This is because, as a scientific discipline evolves, so too must the principles to which it adheres. I kept adding new principles while simultaneously revising or even deleting long familiar principles.The Principle of Trees as Dynamic Entities The Principle of Plurality The Principle of Aggregate Tree Growth The Principle of Limiting Factors The Principle of Spatiotemporal Replication The Principle of Site Selection ( = word = the science of): The science that uses tree rings dated to their exact year of formation to analyze temporal and spatial patterns of processes in the physical and cultural sciences.The science that uses tree rings to date when timber was felled, transported, processed, or used for construction or wooden artifacts.

The science that uses tree rings to date and study the past dynamics of insect populations.

Example: dating the inside rings of trees on moraines to establish the approximate date of a glacial advance.

The science that uses tree rings to study changes in river flow, surface runoff, and lake levels.

Basically, this concept reinforces a central concept taught to all fledgling dendrochronologists: " As used in dendrochronology, this principle states that rates of plant processes are constrained by the primary environmental variable(s) that is most limiting. Tree growth “is controlled not by the total amount of resources available, but by the scarcest resource.” For example, precipitation is often the most limiting factor to plant growth in arid and semiarid areas.

In these regions, tree growth cannot proceed faster than that allowed by the amount of monthly, seasonal, or annual total precipitation, causing the width of the rings (i.e., the volume of wood produced) to be a function of precipitation.

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