what is the average amount of CO2 sequestered per year over the life of a douglas fir tree?

A Douglas fir (Pseudotsuga menziesii) typically sequesters an average of approximately 20 to 30 kilograms (about 45 to 65 pounds) of CO2 per year over the course of its lifespan.

This figure is an approximation. The actual rate varies significantly based on:

• Age: Sequestration is low during the sapling stage, peaks during the tree's rapid growth phase (typically between ages 20 and 60), and declines as the tree matures.
• Site Quality: Factors such as soil quality, rainfall, temperature, and elevation directly influence growth rates.
• Density: How closely the trees are planted affects competition for sunlight and nutrients, which dictates individual growth.

Because trees sequester carbon at different rates throughout their lives, this "average" reflects a lifetime smoothing of those growth cycles.