LANZHOU: For decades, the people of China’s arid northwestern region battled shifting sands with simple tools — pressing straw into the desert to form grids that trapped the windblown grit. Today, scientists are deploying cutting-edge biotechnology, mechanized equipment, and recycled materials to reclaim the land at an unprecedented pace.
In the 1950s, straw checkerboards saved a section of the Baotou-Lanzhou Railway from being buried by dunes.
Now, researchers at the Northwest Institute of Eco-Environment and Resources have supercharged this method using biological soil crusts — a “living carpet” of cyanobacteria that is able to stabilize sand within 10 to 16 months.
“The crust acts like glue, locking sand in place while blocking invasive plants,” said Li Xinrong, a researcher with the institute.
His team cultivates drought-resistant cyanobacteria to accelerate crust formation from over 10 years to just two to three years, which boosts shrub survival rates by up to 15 percent and significantly cuts costs. The technique, already covering over 4,000 mu (about 267 hectares) of sandy land in Ningxia, is now a key weapon in China’s desert-control arsenal.
Li indicated that the technology, which targets the restoration of soil habitats, boasts several advantages, including a short construction period, high stability, high sand-fixing efficiency, excellent desertification control outcomes, broad applicability, and ease of operation. “It is a powerful tool for China’s efforts in combating desertification and represents one of the most advanced sand-fixing and near-natural ecological restoration technologies both domestically and internationally,” Li noted.
In China’s decades-long war against desert expansion, its latest weapon comes from an unexpected source: retired wind turbine blades.
A research team at the Dunhuang Gobi Desert Research Station under the Northwest Institute of Eco-Environment and Resources has pioneered a groundbreaking approach by repurposing these fiberglass blades into highly effective sand barriers.
Traditional sand control methods using straw or reed barriers, while effective to some degree, face limitations in China’s harsh desert environments. These organic materials can easily degrade when exposed to the region’s extreme climate conditions.
The turbine blade solution overcomes the weakness through remarkable material properties. After extensive testing including UV aging, thermal cycling, erosion, and flexural strength assessments, the researchers found their engineered barriers demonstrate an excellent bending strength that is 14 times greater than wood composites, as well as exceptional resistance to thermal stress and UV degradation.
Scientists are optimistic that this innovation will play a particularly significant role in protecting critical infrastructure, such as highways and railways that traverse desert regions. Field applications are currently being conducted in the hyper-arid Dunhuang City to check its results. –Agencies
