China has 142.6 billion trees, researchers estimate

Chinese scientists have successfully estimated the number of trees in the country using a laser-based technique called lidar. Their findings indicate that China has about 142.6 billion trees, which translates to roughly 100 trees for every person living there. Researchers noted that this figure might actually be low. The 2019 National Forest Resources Inventory reported an average of 426 trees per acre, far more than the new estimate of 279 trees per acre. This discrepancy highlights the need for more research to confirm the actual number of trees. The accurate counting of trees is essential for assessing forest ecosystems and understanding how much carbon is being stored in them. The lead author of the study, Qinghua Guo from Peking University, emphasized that this research also contributes to China's environmental goals. To make their estimates, researchers gathered lidar data since 2015, covering an area of 540 square miles. They used AI software called Lidar360 to analyze the data and produce a national tree count. However, the technology has limitations. For example, it struggles to detect trees beneath thick canopies, which might lead to undercounts. Experts say the results fit well with previous estimates. Globally, there are about 400 trees per person. Therefore, China's lower figure makes sense given its high population density. China is also actively planting trees to increase its forest cover. The Great Green Wall project aims to create a massive belt of trees to combat desertification. Launched in 1978, it is expected to plant about 100 billion trees by 2050. Overall, the study's technology not only assists in counting trees but also helps optimize reforestation efforts. Guo remarked that using precise data can ensure that new trees are planted in the most suitable locations.