Response of vegetation phenology to hydrothermal variables on the QTP using EVI and MSAVI.
Zhao Z, Lin H, Wang L, Huang M, Wu L, Tang L, Yang T, Xiao X.
Phenology
Shifting growing seasons on the Tibetan Plateau ripple downstream into the water and carbon cycles that feed rivers and weather patterns across South and East Asia—regions that grow food for billions of people.
Researchers looked at two decades of satellite images to track when plants on the Tibetan Plateau wake up and go dormant each year. They discovered that the key factor stretching or shrinking the growing season is when plants stop growing in autumn, not when they start in spring. Warmer land surfaces—detected from space—turned out to be a better clue for predicting these changes than rain gauges or traditional thermometers scattered across this vast, remote region.
Key Findings
From 2001 to 2020, the end of the growing season showed a significant positive correlation with land surface temperature—warmer surfaces linked to later seasonal shutdowns.
The length of the growing season is primarily controlled by when the season ends (autumn), not when it begins (spring).
Satellite-derived variables (land surface temperature, effective moisture, surface albedo) explained vegetation timing changes better than traditional air temperature and precipitation records.
chevron_right Technical Summary
Scientists studying the Qinghai-Tibet Plateau found that land surface temperature—measured by satellite—better predicts when plant growing seasons end than traditional weather station data, and that the season's end date, not its start, is the main driver of how long plants grow each year.
Abstract Preview
Vegetation phenology is a key indicator of how the Qinghai-Tibet plateau (QTP) ecosystem responds to changes in the hydrothermal environment. However, sparse QTP meteorological stations make observ...
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