In Simple Terms
Scientists used to think that more carbon dioxide in the air made trees grow faster and store more carbon. But new findings show that trees can keep absorbing carbon even after they stop growing. This means growth and carbon storage aren’t always linked as we thought.
Photosynthesis: More Than Just Growth
During photosynthesis, plants use light to turn carbon dioxide and water into sugar and oxygen. Not all the carbon stays in the plant to build wood. Some of it makes leaves and fruit, or is stored temporarily, or turned into compounds that enrich the soil and protect the tree.
Seasonal Differences in Growth and Photosynthesis
Researchers found a time gap between when trees stop growing and when photosynthesis continues, especially in the U.S. In the East, oak trees grow from May to July, but photosynthesis goes on until October. In California, photosynthesis persists even after summer growth stops.
Impact on Climate Predictions
The discovery that growth and photosynthesis aren’t synchronized has big implications for predicting how forests store carbon. Climate models might need to adjust their assumptions about forests’ future carbon storage abilities. Expected climate changes, like shifts between drought and rain, could heighten this effect.
Conclusion
This study shows the link between photosynthesis and growth isn’t as straightforward as once thought. While trees keep absorbing carbon, growth doesn’t always happen alongside this process. Future predictions about forests’ carbon storage capacity may need revising to account for these differences.