Nearly half a century ago, China embarked on a monumental tree-planting initiative on a scale without global precedent. Now, a recent study, released on Thursday, July 11, 2026, reveals that these planted forests are experiencing unexpected growth, impacting the understanding of climate models.
The ambitious Great Green Wall against desertification
Since 1978, the Asian giant has planted around 66 billion trees as part of the project called the Great Green Wall. This extensive vegetation barrier was designed to stop the advance of the Gobi and Taclamacã deserts, which historically swallowed vast prairies in the north of the country, with the Gobi desert advancing more than 2,600 square kilometers annually. The initiative not only reduced dust storms, but also improved air quality in large urban centers.
Previous research, highlighted in a scientific publication, indicated that forest cover in the affected regions jumped from 5% in 1978 to 14% in 2023. Currently, China plans to add another 34 billion trees by the middle of this century, further transforming the landscape that no longer resembles the scenario of the late 1970s.
Planted forests react uniquely to carbon dioxide
New scientific research, published in a specialized journal, adds a surprising facet to this story. Artificially created forests appear to react to the increase in carbon dioxide (CO₂) differently than natural forests. This difference results in a much faster growth of leaf cover, although the exact mechanisms are still the subject of study.
To reach this conclusion, the team led by Yuhang Luo, an expert in landscape ecology at Peking University in Shenzhen, used satellite observations of the leaf area index. This metric assesses the density of foliage and its ability to capture carbon. The results showed that the indicator increased 66% faster in planted forests compared to natural ones.
Factors driving growth and their limitations
Part of this growth advantage can be attributed to the youth of the plantations, which are still in their fastest development phase. However, age alone does not explain the entire phenomenon; Even when compared to natural forests of similar age and conditions, reforested areas grew 4.6% faster.
Another explanation lies in the intensive management of these plantations. They are often composed of fast-growing species, such as eucalyptus and poplars, and receive care that optimizes the absorption of light, water and nutrients, amplifying their response to atmospheric CO₂.
This advantage, however, is temporary, reaching its peak between 30 and 40 years before starting to decline. Natural forests, on the other hand, maintain slower but constant development, offering greater resilience and long-term carbon storage capacity, according to the researchers’ conclusions.
Implications for climate models and future actions
Luo explained that these results reveal an important limitation in current climate models. Many of them do not adequately differentiate between natural and planted forests, nor do they take into account the age or management history of each forest area. This gap can distort the assessment of its real carbon capture capacity.
The researcher emphasized that although planted forests can be an effective short-term tool for carbon capture, this advantage is transitory. For carbon storage and long-term resilience, natural forests remain irreplaceable.
Critical voices and the complexity of carbon storage
Not all experts fully agree with the research conclusions. Kevin Dsouza, a researcher at the University of Waterloo who studies reforestation models, assessed that the leaf area index is a useful indicator, but insufficient for estimating the total amount of carbon that a forest actually stores.
Dsouza argued that a significant portion of carbon accumulates in wood, bark, roots and soil, and not just in the tree canopy. He pointed out that other studies on Chinese forests have indicated that natural areas may also accumulate more carbon above ground during their early years of development, suggesting the results should be interpreted with caution.
Lessons for the future of large-scale reforestation
Still, the scale of the Chinese project continues to be exceptional. Data collected by researchers indicates that, in 2020, planted forests in southern China covered 90.3 million hectares, which corresponds to 36.6% of the country’s entire forest area. Other research estimated that the forested strip along the Taclamacã Desert captured approximately 8.3 million tons of CO₂ per year between 2004 and 2017, while emitting around 6.7 million tons annually, acting as a net carbon sink during that period.
For Luo, the main lesson is not to abandon tree planting, but rather to do it more strategically, better defining when to plant, which species to use and how to manage them. In the researcher’s assessment, the objective is to provide “more practical guidance for forest-based climate action”, helping to improve future large-scale reforestation projects around the world.
Key discoveries about China’s planted forests
- 66% faster growth in leaf area than natural forests.
- Advantage due to young age, fast-growing species and intensive management.
- Temporary benefit, peaking between 30 and 40 years of age, decreasing afterwards.
- Implications for climate models, which can underestimate or overestimate carbon capture without differentiating forest types.
- They contribute to reducing desertification and improving air quality, but have limitations for long-term carbon storage.
- Species choice and management are crucial to the effectiveness of reforestation projects.
