China constantly impresses with the grandeur of its projects. From rapidly constructed skyscrapers to complex bridges and the emergence of entire cities, the country demonstrates a monumental scale in its initiatives.
On Saturday, July 11, 2026, a less visible but equally colossal initiative had its results examined by a new study. The planting of trees on an unprecedented scale globally is revealing surprising behavior in cultivated forests.
China creates the Great Green Wall to combat desert advance
Since 1978, the Chinese nation has implemented the Great Green Wall, planting approximately 66 billion trees. This project aimed to establish a plant barrier to stop the expansion of the Gobi and Taclamacã deserts, preventing sand from consuming the northern prairies, where the Gobi desert advanced by around 2,600 square kilometers annually.
The Chinese plan envisages the planting of an additional 34 billion trees by 2050, which will significantly alter the landscape that has already been transformed since the late 1970s.
Interestingly, this immense forest barrier was not designed to combat climate change, but rather to stop desertification. However, its impacts extended far beyond the original target, influencing the global carbon budget in complex and unexpected ways, which is crucial for understanding climate models.
Forest coverage in the areas covered has grown from 5% in 1978 to 14% in 2023. Consequently, there has been a reduction in dust storms and an improvement in air quality in large urban centers.
New study shows that artificial forests grow faster than natural ones
A recent investigation, published in Geophysical Research Letters, reveals a surprising aspect: cultivated forests react to the increase in carbon dioxide in a different way than natural forests. This disparity results in a much more accelerated expansion of leaf coverage, although the precise reasons for this phenomenon are still being studied by scientists.
To arrive at this discovery, landscape ecologist Yuhang Luo’s team from Peking University in Shenzhen examined satellite data. They analyzed the leaf area index, which measures the density of foliage and its correlation with the ability of forests to absorb carbon from the atmosphere.
The results indicated that this index increased 66% faster in artificially created forests compared to natural forest areas.
Tree management and species influence accelerated growth
Part of this difference can be attributed to the age of the plantations, which, being younger, are still in their most vigorous growth stage.
However, age alone does not completely justify the observed phenomenon. Even when compared with natural forests of comparable age and conditions, the reforested areas showed 4.6% faster growth.
Another explanatory element lies in the way these plantations are managed. In addition to frequently using rapidly developing species, such as eucalyptus and poplars, they receive intensive forestry management. This care optimizes the absorption of light, water and nutrients, enhancing the trees’ response to the increase in carbon dioxide.
Benefits of planting trees are time-limited
This advantage, however, proves to be temporary. Its peak occurs when the trees reach an age of between 30 and 40 years, progressively decreasing from there.
Natural forests, on the other hand, exhibit more gradual but continuous development. This gives them superiority in carbon storage and long-term resilience, as highlighted by the study.
Luo points out that these findings highlight a flaw in many current climate models. They fail to appropriately distinguish between natural and cultivated forests, and to consider the age or management history of each area, which can lead to inaccurate assessments of actual carbon capture capacity.
“Artificial forests represent an effective tool for short-term carbon capture, but their benefit is fleeting. For lasting carbon storage and long-term resilience, natural forests remain irreplaceable,” said Luo.
Criticisms and reservations about the research conclusions
However, not all experts fully agree with the conclusions presented in the research.
Kevin Dsouza, a researcher at the University of Waterloo with experience in reforestation models, noted that the leaf area index, although useful, is not enough to determine the total amount of carbon stored by a forest.
A considerable portion of this carbon is accumulated in wood, bark, roots and soil, and is not restricted to just the tree canopy.
Dsouza also mentioned that other analyzes of Chinese forests indicate that natural areas may also accumulate more carbon above ground in their early stages. Therefore, he suggests that the results of the current study be evaluated with caution.
Reforestation project acts as a major carbon sink
Despite the discussions, the magnitude of the reforestation project remains remarkable.
In 2020, cultivated forests in southern China totaled 90.3 million hectares, accounting for 36.6% of the country’s total forest area.
Another study calculated that the wooded area near the Taclamacã desert absorbed around 8.3 million tons of CO₂ annually between 2004 and 2017. In the same period, approximately 6.7 million tons were emitted per year, demonstrating that the region acted as a net carbon sink.
For Luo, the main conclusion is not to abandon tree planting, but rather to carry it out in a more strategic way. It is crucial to determine the ideal time for planting, the most suitable species and the best way to manage these forests.
In the researcher’s view, the purpose is to provide “more practical guidance for forest-based climate action.” This will help improve future large-scale reforestation projects.
