Researchers studied how carbon storage in different types of forests in Beijing changed over a 5-year period. They used data from China's national forest inventory to estimate the amount of carbon stored in the forests. The study found that the total carbon storage in Beijing's forests increased from 7.96 million to 8.52 million tons. Forest types and area were linked to changes in carbon storage, with certain tree species like Quercus and Populus playing a significant role. Younger forests had a large area but stored less carbon compared to mature forests. The age structure of forests influenced carbon storage, with carbon density increasing as forests aged. Stand factors also impacted the carbon sink capacity of the forests.