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Long-Term Research With 76 Forest Plots Monitored For Up To 20 Years In Central America Shows That High Levels Of Soil Nitrogen Can Accelerate Tropical Forest Regeneration By Up To Two Times After Deforestation, With Direct Effects On Carbon Sequestration And Climate Policies
A study led by the University of Leeds shows that this hidden nutrient in the soil can double the forest’s recovery speed after deforestation by accelerating tree growth, enhancing carbon sequestration, and influencing global climate restoration strategies.
The research demonstrates that tropical forests can recover up to two times faster when soil nitrogen levels are high.
The work highlights that underground factors play a central role in forest regeneration after human activities such as agriculture, livestock, and logging.
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To investigate this process, scientists conducted the largest and longest-running experiment ever performed on tropical forest regeneration.
The focus was to understand how different soil nutrients affect the recovery speed of previously deforested and degraded areas.
Long-Term Experiment With Forest Plots In Central America
The team selected 76 forest plots distributed across Central America. Each plot was approximately one-third the size of a football field and represented forests in different stages of natural regeneration after human use.
The growth and mortality of trees in these plots were monitored for a period of up to 20 years. This extended monitoring allowed for the assessment of structural changes in the forest over time, based on continuous measurements.
The plots received four distinct treatments. Some were fertilized with nitrogen fertilizer, others with phosphate fertilizer, a third group received both nutrients, and a fourth group received no fertilization at all.
This experimental design allowed for the isolation of the specific effects of each nutrient on forest recovery. Researchers were able to directly compare treated and untreated areas under similar climate and land-use history conditions.
Nitrogen Emerges As A Decisive Factor In Regeneration
The results indicated that soil nutrients significantly influence the recovery of tropical forests. During the first decade after the abandonment of the areas, plots with adequate nitrogen levels showed recovery nearly twice as fast.
Phosphorus, when applied alone, did not produce the same accelerating effect observed with nitrogen. The combination of phosphorus and nitrogen also did not exceed the results obtained with nitrogen alone, reinforcing its central role.
These findings show that this hidden nutrient in the soil can double the forest’s recovery speed in early stages, a period considered critical for the reconstitution of the structure and ecological functions of the tropical forest.
The study involved researchers from institutions in Europe, North America, and Asia. The results were published on January 13 in the journal Nature Communications, after two decades of data collection and analysis.
Direct Impacts On Carbon Sequestration And Climate
Tropical forests are among the planet’s major carbon sinks. They absorb carbon dioxide from the atmosphere and store it in biomass and soil, contributing to climate change mitigation.
A faster growth rate of trees means a higher rate of carbon sequestration in the early years of regeneration. This enhances the role of secondary forests in reducing greenhouse gas concentrations.
Researchers estimate that if nitrogen limitation affects young tropical forests on a global scale, about 0.69 billion tons of carbon dioxide per year would not be stored. This volume is roughly equivalent to two years of emissions from the United Kingdom.
These numbers reinforce the climate relevance of subterranean processes. The speed of forest recovery directly influences the global carbon balance and the ability of tropical ecosystems to respond to climate change.
Limits Of Fertilization And Nature-Based Alternatives
Despite the experimental results, researchers emphasize that direct fertilization of forests is not recommended as a management strategy. The large-scale application of nitrogen fertilizers can lead to unwanted side effects.
Among these effects are increased emissions of nitrous oxide, a potent greenhouse gas, as well as negative impacts on biodiversity and water quality. Therefore, fertilization was used only as a scientific tool.
As an alternative, scientists suggest nature-based practices. One of these is planting trees from the legume family, which can naturally and gradually enrich the soil with nitrogen.
Another option is to prioritize restoration projects in areas that already have excess nitrogen due to atmospheric pollution. These areas could show faster regeneration without direct artificial interventions.
Connections To Climate Policies And Global Restoration
The study was released shortly after the conclusion of COP 30 in Brazil, where the Tropical Forests Forever Fund was announced. The initiative aims to support tropical countries in the protection and restoration of forests.
The findings provide scientific evidence to guide decisions on where and how to invest in forest restoration. Identifying factors that accelerate recovery can increase the efficiency of natural climate solutions.
The authors emphasize that preventing the deforestation of mature forests remains a priority. However, understanding how this hidden nutrient in the soil can double the forest’s recovery speed helps maximize the benefits of already degraded areas.
By integrating long-term data, the study contributes to a more accurate view of the role of secondary forests in addressing climate change. The results highlight that invisible processes beneath the soil can define the pace of global ecological response.
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