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[Tree-rings width variability along latitudinal and paleolatitudinal gradients].

S N Sheremetiev, Yu V Gamalei, N N Slemnev

Zhurnal Obshchei Biologii

|July 20, 2018

Summary

Tree-ring width (TRW) closely relates to tree age and radial growth, influenced by climate. Cretaceous trees showed higher growth and different TRW patterns compared to modern trees.

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Area of Science:

Paleoclimatology
Dendrochronology
Ecology

Background:

Tree-ring width (TRW) is a key indicator of tree growth and environmental conditions.
Understanding factors influencing TRW is crucial for reconstructing past climates and ecosystems.

Purpose of the Study:

To analyze the relationship between TRW, tree age, radial growth, and climatic factors.
To investigate latitudinal variations in TRW and compare Cretaceous patterns with modern data.

Main Methods:

Analysis of 57,596 dated tree-ring width series from the International Tree-ring Data Bank.
Correlation analysis between TRW, tree age, radial growth, and climatic/biological indicators.
Comparison of paleolatitudinal TRW profiles from the Cretaceous with modern profiles.

Main Results:

TRW shows a strong correlation with tree age and periods of radial growth, particularly in the first 150 years.
Latitudinal TRW profiles align with climatic and biological indicators, influenced by climate and productivity.
Cretaceous TRW profiles exhibited a distinct peak around 30°N latitude, with growth rates twice that of modern trees.

Conclusions:

Tree age and synchronized radial growth with climate cycles significantly impact TRW.
Climate and productivity shape latitudinal TRW patterns.
Cretaceous TRW patterns differed significantly from modern ones, indicating distinct paleoclimatic and ecological conditions.