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Increasing productivity in recent European oak trees?
Radiation and Environmental Biophysics
|January 1, 1983
Summary
Tree ring analysis reveals exponential growth trends in European oak biomass, indicating significant changes in the carbon cycle. These findings offer insights into the biosphere
Area of Science:
- Dendrochronology
- Ecology
- Climate Science
Background:
- The biosphere plays a crucial role in the Earth's carbon cycle.
- Understanding biomass changes is essential for assessing carbon cycle disturbances.
Purpose of the Study:
- To analyze growth trends in tree ring series of European oak trees.
- To investigate the role of standing biomass in the disturbed carbon cycle.
Main Methods:
- Analysis of 27 oak trees (ages 25-262 years) from diverse European locations.
- Application of a two-parameter smoothing function to tree ring widths to remove annual variations.
- Statistical analysis of smoothed ring widths (40th and 80th rings) plotted against time, modeled by an exponential function: delta rn(t) = delta r0n + aebt.
Main Results:
- Tree ring width variations (delta r) over time (t) are best described by an exponential function.
- The pre-industrial growth trend (delta r0n) matches historical averages for European oak trees.
- Identified a significant growth trend in oak trees over the study period.
Conclusions:
- The biosphere, specifically standing biomass, exhibits measurable growth trends.
- These trends are linked to changes in the carbon cycle.
- Further research is needed to determine the causes of these observed growth patterns.