Tree Diversity Protects U.S. Forests from Climate Extremes

A recent study has shown that higher tree species diversity can help safeguard U.S. forests from the escalating threat of compound climate extremes, such as simultaneous drought and extreme heat. Researchers examined data from 88,116 individual forest plots nationwide, assessing how varying levels of biodiversity influence forest resilience when multiple stressors occur together.

The analysis revealed that plots with greater species richness experienced lower rates of tree mortality and faster recovery during periods of combined drought and heat stress compared to less diverse stands. The researchers attributed this effect to complementary resource use, increased functional redundancy, and a broader range of physiological tolerances among diverse species, which together buffer against the impacts of extreme weather events.

These findings underscore the importance of preserving and promoting species diversity in forest management and restoration efforts. By maintaining heterogeneous tree communities, land managers can enhance the capacity of forests to withstand and recover from the increasingly frequent and severe compound climate extremes projected under current climate change scenarios.