Abstract
Using the National Aeronautics and Space Administration (NASA) Global Inventory, Monitoring, and Modeling Studies (GIMMS) Normalized Difference Vegetation Index (NDVI) dataset (1982–2006), Yu et al. (1) found that the trend of advancing spring phenology for alpine steppe and meadow was reversed around 2000, despite the increasing air temperature over the Tibetan Plateau. This phenomenon cannot be explained by changes in precipitation or snow melt. They speculated that the lack of fulfillment of a chilling requirement caused by warming winters could be the reason. This might have significant implications for the ecosystem and economy of the Tibetan Plateau. However, we …
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