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Forests, Volume 9, Issue 4 (April 2018)
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Cover Story (view full-size image) In a long-term experiment in Costa Rica, we evaluated the effects of four native tree species on [...] Read more. In a long-term experiment in Costa Rica, we evaluated the effects of four native tree species on soil macroaggregate structure. In this Oxisol in which Fe and Al oxides were expected to be the major aggregate cementing agents, aggregates ≥1 mm in diameter accounted for 72% of total soil. The tree species differed in effects on size distributions of aggregates <1 mm, which were correlated with fine-root growth and Al in litterfall. Tree species also differed in effects on soil pH, which was negatively correlated with smaller aggregate fractions. This suggests an important linkage between these two master soil variables, pH and macroaggregate structure. Alteration of soil pH by tree species could affect release of elements situated within aggregates, thus influencing soil C, N and P cycling. View the paper here.