Scientists found the soil secret that doubles forest regrowth

Scientists found the soil secret that doubles forest regrowth Date: January 15, 2026 Source: University of Leeds Summary: New research shows tropical forests can recover twice as fast after deforestation when their soils contain enough nitrogen. Scientists followed forest regrowth across Central America for decades and found that nitrogen plays a decisive role in how quickly trees return. Faster regrowth also means more carbon captured from the atmosphere. The study points to smarter reforestation strategies that work with nature rather than relying on fertilizers. Share: Newly published research finds that tropical forests can rebound up to twice as fast after deforestation when their soils contain enough nitrogen. The study shows that what happens below ground plays a major role in how quickly forests return after land has been cleared. Scientists led by the University of Leeds launched the largest and longest experiment ever designed to examine how nutrients shape forest regrowth. The work focused on tropical areas previously cleared for activities such as logging and agriculture. Tracking Forest Regrowth Over Decades The researchers selected 76 forest plots across Central America and monitored them for as long as 20 years. Each site differed in age and size, allowing the team to follow how trees grew and died as forests recovered over time. To test the role of nutrients, the plots received different treatments. Some were given nitrogen fertilizer, others phosphorus fertilizer, some received both nutrients, and some were left untreated. This approach allowed the scientists to directly compare how forests responded under different soil conditions. Nitrogen Emerges as a Key Driver The results showed that soil nutrients strongly influence how quickly tropical forests regrow. During the first 10 years of recovery, forests with adequate nitrogen rebounded at about twice the rate of those lacking it. Phosphorus alone did not produce the same effect. The study included researchers from the University of Glasgow, the Smithsonian Tropical Research Institute, Yale University, Princeton University, Cornell University, the National University of Singapore, and the Cary Institute of Ecosystem Studies. The findings were published on January 13 in the journal Nature Communications . Implications for Climate and Reforestation Lead author Wenguang Tang, who carried out the research while completing his PHD at the University of Leeds, said: "Our study is exciting because it suggests there are ways we can boost the capture and storage of greenhouse gases through reforestation by managing the nutrients available to trees." Although nitrogen fertilizer was used in the experiment, the researchers do not recommend fertilizing forests. Widespread fertilizer use could lead to harmful side effects, including emissions of nitrous oxide, a powerful greenhouse gas. Instead, the team suggests practical alternatives. Forest managers could plant trees from the legume (bean) family, which naturally add nitrogen to the soil. Another option is restoring forests in areas that already have sufficient nitrogen due to the effects of air pollution. Why Faster Regrowth Matters for the Climate Tropical forests are among the world's most important carbon sinks. They help slow climate change by removing carbon...

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