Why natural forests survive heat waves better than planted forests
When a record-breaking drought and heat wave swept across China's Yangtze River Basin in 2022, forests across the region faced an extreme test. The event provided a rare opportunity for researchers to test how different forests respond when rising temperatures and water shortages strike at the same time.
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But as climate change drives more frequent and intense combinations of drought and extreme heat, researchers wanted to understand whether these planted forests could cope with increasingly challenging conditions and how they respond compared with forests that developed naturally. The study focused on compound drought–heat wave events, where unusually hot and dry conditions occur at the same time.
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The findings, published in Water Resources Research, reveal a balance between two important aspects of forest resilience: the ability to resist damage during a weather event and the ability to recover afterward.
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The researchers suggest this stronger resistance may be linked to the greater complexity of natural forests. They typically contain a wider variety of tree species that respond differently to drought and heat, different tree ages and more layered canopies, creating a varied ecosystem that can better buffer extreme conditions.
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