For example, an index of 0.75 (or 75) for a given year indicates growth below normal (indicated by 1.00, or 100).
The process that removes undesirable long-term variations from a time series of measured tree-ring properties by dividing the actual measurements by those predicted from a statistically derived equation that relates tree growth over time to tree age.
One is Relative Dating, and the other is Absolute Dating.
Absolute dating to determine the actual age of an object or stratigraphic layer, and relative dating to tie associated artifacts and layers into the sequence provided by the absolute dates.
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.
A layer of wood cells produced by a tree or shrub in one year, usually consisting of thin-walled cells formed early in the growing season (called earlywood) and thicker-walled cells produced later in the growing season (called latewood).
The beginning of earlywood formation and the end of the latewood formation form one annual ring, which usually extends around the entire circumference of the tree.
The science that uses tree rings to date and study past and present changes in wildfires.
Example: dating the fire scars left in tree rings to determine how often fires occurred in the past.
The science that uses tree rings to study present climate and reconstruct past climate.
Example: analyzing ring widths of trees to determine how much rainfall fell per year long before weather records were kept.
The science that uses tree rings to date earth surface processes that created, altered, or shaped the landscape.
Example: analyzing changes in tree growth patterns via tree rings to date a series of landslide events.
Usually this process tries to remove the growth trends due to normal physiological aging processes and changes in the surrounding forest community.