To make fast-growing wood more useful for commercial purposes, researchers treated poplar wood by removing certain parts and adding a substance called alkali lignin. They found that a combination of removing hemicellulose and adding alkali lignin made the wood much more stable when exposed to moisture. The modified wood had less swelling compared to untreated wood. Removing hemicellulose alone reduced swelling by 11%, adding alkali lignin reduced it by 21%, and the combined treatment reduced swelling by over 50%. This shows that this method helps to improve the wood's dimensional stability, making it better for use in various products. By changing the wood's chemical composition, it becomes less affected by changes in humidity, which could help in using fast-growing wood more efficiently and making industrial alkali lignin even more valuable.