The Taklamakan in northwest China, long seen as a lifeless sea of sand, is now at the centre of a vast climate experiment. A decades-long tree-planting drive has pushed greenery into a landscape once written off as hopeless, and new research suggests this massive man-made forest is now pulling more carbon dioxide from the air than it releases.
From “biological void” to carbon sponge
The Taklamakan Desert, in China’s Xinjiang region, covers around 337,000 square kilometres — more than half the size of France. Ringed by high mountain ranges that block moist air, it is one of the planet’s most arid deserts.
Even during the so-called wet season, from July to September, monthly rainfall barely reaches 16 millimetres. For much of the 20th century, scientists described the area as a “biological void”, almost entirely hostile to plant life.
That picture is now changing. According to a study published in the journal PNAS in January, the fringes of the Taklamakan have flipped from being a carbon source to a carbon sink. In plain English, the ecosystem there is now absorbing more CO2 than it emits.
New satellite and ground data indicate that the Taklamakan’s vegetated belt now behaves like a net carbon sink during the wet season.
Lead author Yuk L. Yung, from NASA’s Jet Propulsion Laboratory and Caltech, says the findings show that deliberate human intervention can strengthen carbon storage in drylands, a result many climate researchers once thought unrealistic.
The great green wall that encircles a desert
This shift is the outcome of one of the most ambitious ecological engineering projects on the planet: China’s “Great Green Wall”.
Launched in 1978, the programme set out to slow the march of the Taklamakan and the neighbouring Gobi Desert by planting huge belts of trees and shrubs around their edges. The aim was not just to trap sand, but to shield farms, towns and infrastructure from relentless dust storms.
Sixty-six billion trees and a 3,000 km ring
Chinese authorities say that, since the start of the project, more than 66 billion trees have been planted across northern China. Many were placed along the Taklamakan’s margins in an arc of shelterbelts designed to bind the dunes in place.
- Start of project: 1978
- Reported trees planted nationwide: 66+ billion
- Vegetation ring around Taklamakan: ~3,000 km closed in 2024
- National forest cover: from about 10% to over 25%
Species were chosen for their toughness rather than their beauty: hardy poplars, salt-tolerant saxaul trees, and low shrubs that can cling to sandy soils with minimal water. Many of these species have deep roots that stabilise dunes and tap groundwater.
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In 2024, Beijing announced that the vegetated ring around the Taklamakan had effectively closed. From space, satellite images now show a clear belt of green tracking along what used to be shifting sand.
How scientists measured the desert’s new role
The research team combined multiple data sources to check whether this greenery is actually changing the desert’s carbon balance.
They used satellite images to track vegetation cover over a 25-year period, focusing on signs of photosynthesis — the process plants use to turn sunlight, water and CO2 into sugars. They also pulled in ground measurements from meteorological and ecological monitoring stations spread around the desert’s periphery.
Over a quarter of a century, the Taklamakan’s vegetated belt has shown both denser greenery and a measurable drop in CO2 concentrations during the wet season.
The study reports that, during the summer months, average CO2 levels near this green belt fell from about 416 parts per million to around 413 parts per million. That may sound small, but in climate science, a three-parts-per-million seasonal dip over such a large area is significant.
At the same time, vegetation indices — numerical measures of “greenness” derived from satellite sensors — rose steadily. The data point to more vigorous plant growth, more photosynthesis, and therefore more carbon locked into biomass and soils.
A local climate feedback loop
As plants spread, the climate around the desert began to shift too. The study found that summer rainfall in the vegetated zones has roughly doubled compared with levels seen a few decades ago.
Trees and shrubs release water vapour through their leaves, which adds moisture to the air. That extra humidity can promote cloud formation and, in some cases, more rainfall. Greater rainfall then supports further plant growth, setting up a feedback loop:
- More plants → more evaporation and transpiration
- More atmospheric moisture → higher chance of summer rain
- More rain → better conditions for plants to survive and expand
This feedback does not turn a desert into a rainforest, but it can soften the harshness of the margins, creating pockets of semi-arid woodland and scrub that store carbon and reduce dust.
Can trees really tame the sandstorms?
For communities in northern China, the Great Green Wall was always about more than carbon. The country’s big cities, especially Beijing, have long been battered by sandstorms blowing in from the west.
As deserts expanded under pressure from overgrazing, irrigation, urbanisation and climate change, those storms became stronger and more frequent. Crops were buried, transport shut down, and public health suffered as air filled with fine dust.
Officials hoped that dense rows of trees would act as a physical barrier, slowing winds and catching sand. The new study suggests the belt now also works as a carbon sink, but some scientists question how far these plantings have actually cut dust storms on a regional scale.
The Taklamakan’s new tree line absorbs CO2, yet its full impact on dust storms and regional air quality remains contested among researchers.
Measuring sandstorm trends is tricky. Wind patterns, precipitation changes and land use far beyond the planted zones all play a role. Some independent teams argue that meteorology, not only tree planting, explains much of the variation in recent decades.
Costs, risks and unintended consequences
Turning desert edges green is not a free climate solution. The Taklamakan scheme comes with serious trade-offs that Chinese scientists and officials are now debating more openly.
Water stress in an already dry land
Every tree needs water. In an area where rainfall is tiny and glaciers feeding rivers are shrinking under global warming, that creates tension.
Many of the planted forests rely on irrigation from groundwater or rivers that also supply farms and towns. As roots suck up moisture, water tables can fall. Some hydrologists warn that heavy planting may slowly drain aquifers and leave less water for local people over the long term.
There are also questions about survival rates. Large-scale campaigns often focus on how many seedlings go into the ground, not how many are still alive 10 or 20 years later. Reports from parts of northern China indicate that poorly adapted species died off in waves, leaving patchy or monoculture stands with limited ecological value.
Biodiversity and monoculture worries
The Great Green Wall has often favoured fast-growing, single-species plantings. These can stabilise soil quickly but support fewer insects, birds and mammals than natural, mixed woodlands or native grasslands.
Ecologists caution that dense, uniform plantations may be more vulnerable to pests, disease and drought. If one species fails under future climate conditions, large areas could wither at once, releasing some of the stored carbon back into the atmosphere.
Greening deserts with trees works best when the species are diverse, drought-adapted and matched carefully to local water realities.
What this means for other dry regions
Despite the caveats, the Taklamakan experiment carries strong symbolism. It shows that even harsh drylands can, under the right conditions, act as carbon sinks.
Governments from North Africa to the Middle East are already watching China’s programme. Several of them are pursuing their own “green belts” to stabilise dunes, such as the African Union’s Great Green Wall initiative stretching across the Sahel from Senegal to Djibouti.
Still, the Chinese case suggests that success depends on more than planting huge numbers of trees. Careful species selection, realistic water management, and long-term monitoring all matter as much as headline numbers.
Key concepts behind the Taklamakan’s transformation
For readers less familiar with climate jargon, a few terms help frame what has happened around the Taklamakan.
| Term | Meaning in this context |
|---|---|
| Carbon sink | An area that absorbs more CO2 than it releases, storing it in plants and soils. |
| Desertification | Degradation of land in dry areas, often driven by overuse, deforestation and climate change. |
| Photosynthesis | Process by which plants turn CO2, water and sunlight into biomass, lowering CO2 in the air. |
| Afforestation | Creating forest in places that were not forested in recent history, such as desert fringes. |
In policy terms, the Taklamakan project sits at the intersection of climate mitigation, disaster prevention and rural development. It reduces some risks, such as soil erosion, while potentially raising others, such as long-term water scarcity.
What comes next for China’s great green belt
China now faces a second phase of work: making these new forests last. That likely means shifting from pure tree-count targets towards more nuanced goals, such as water-efficient planting, mixed species, and restoration of native steppe vegetation alongside trees.
Climate models suggest that large-scale vegetation changes can feed back into temperature and rainfall patterns far beyond their boundaries. As the Taklamakan’s vegetation matures, researchers will keep tracking not only CO2 levels, but also dust transport into cities, river flows, and the health of local communities who live at the desert’s edge.
The experiment shows that deserts are not fixed, lifeless spaces on the map. With enough time, money and care, they can store carbon and support new ecosystems — but the balance between green ambition and the limits of water will decide how far such projects can go.
Originally posted 2026-02-16 14:35:46.