Legumes provide an essential service to ecosystems by capturing nitrogen from the atmosphere and delivering it to the soil, where it may then be available to other plants. However, this facilitation by legumes has not been widely studied in global tropical forests. Demographic data from 11 large forest plots (16–60 ha) ranging from 5.25° S to 29.25° N latitude show that within forests, leguminous trees have a larger effect on neighbor diversity than non-legumes. Where soil nitrogen is high, most legume species have higher neighbor diversity than non-legumes. Where soil nitrogen is low, most legumes have lower neighbor diversity than non-legumes. No facilitation effect on neighbor basal area was observed in either high or low soil N conditions. The legume–soil nitrogen positive feedback that promotes tree diversity has both theoretical implications for understanding species coexistence in diverse forests, and practical implications for the utilization of legumes in forest restoration.
Bibliographical noteFunding Information:
This work was supported by NSFC (31670628, 31370441) and National Non-profit Institute Research Grant of CAF (CAFYBB2017ZE001). We thank all persons, institutions, and funds in the Supplementary Note 1 to support the establishment of ForestGEO dynamic plots across the whole world before we could use the data in this paper.
PubMed: MeSH publication types
- Journal Article