Northern permafrost greening masks declining plant resilience, study finds

An international research team, including scientists from the University of Hong Kong, has found that vegetation resilience in Northern Hemisphere permafrost regions has declined since 2008, despite ongoing greening. Published in Nature Plants, the study challenges the notion that increased plant growth always signals a healthy ecosystem.

Permafrost areas, often referred to as the "frozen heartlands," are warming rapidly and causing significant ecological changes. While satellite observations have shown widespread greening in Arctic and boreal regions, it was unclear whether this greening resulted in greater ecosystem stability. Using advanced analysis methods on MODIS satellite data from 2000 to 2023, the researchers discovered that vegetation resilience had declined across the region.

The primary factor behind this decline was intensified atmospheric drying, supported by the presence of wildfires. The study also revealed that carbon uptake became more variable, and many vegetation models failed to account for this resilience reversal. Lead researcher Professor Yuyu Zhou emphasized that even as the vegetation in permafrost regions becomes greener, their ability to recover from environmental disturbances is diminishing, exposing these high-latitude ecosystems to new vulnerabilities caused by climate change.