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Age class, longevity and growth rate relationships: protracted growth increases in old trees in the eastern United States
 

Summary: Age class, longevity and growth rate relationships:
protracted growth increases in old trees in the eastern United States
SARAH E. JOHNSON1,2
and MARC D. ABRAMS1
1
School of Forest Resources, Forest Resources Building, The Pennsylvania State University, University Park, PA 16802, USA
2
Corresponding author (sej141@psu.edu)
Received April 17, 2009; accepted August 1, 2009
Summary This study uses data from the International
Tree-Ring Data Bank website and tree cores collected in
the field to explore growth rate (basal area increment,
BAI) relationships across age classes (from young to old)
for eight tree species in the eastern US. These species
represent a variety of ecological traits and include those in
the genera Populus, Quercus, Pinus, Tsuga and Nyssa. We
found that most trees in all age classes and species exhibit
an increasing BAI throughout their lives. This is partic-
ularly unusual for trees in the older age classes that we
expected to have declining growth in the later years, as

  

Source: Abrams, Marc David - School of Forest Resources, Pennsylvania State University

 

Collections: Environmental Sciences and Ecology