Rwanda planted dozens of exotic tree species in an experimental forest in 1933; 90 years later scientists found eucalyptus had acidified the soil

Eucalyptus plantations became Rwanda’s dominant forestry crop after initial experiments. By the early 1970s, Rwanda had 23,000 hectares of eucalyptus plantations. Scientists examined concerns regarding nutrient removal and soil quality from intensive planting. Research focused on eucalyptus water use in southern Rwanda’s short-rotation woodlots. These woodlots did not necessarily produce a negative annual water balance.
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