Journal
REMOTE SENSING
Volume 13, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/rs13234797
Keywords
autumn phenology; turning point; climate changes; human activities; Qinghai-Tibetan Plateau
Categories
Funding
- Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [2019QZKK0307]
- National Natural Science Foundation of China [41925005, 41701051, 41801181]
- Special Program of Research Center for Eco-environmental Sciences, CAS [RCEES-TDZ-2021-11]
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The study on the Qinghai-Tibetan Plateau from 1982 to 2015 reveals that there are turning points and changes in EOS, with inconsistent rates of change related to temperature, precipitation, and insolation, influenced by climate and human activities. This provides important insights into the growth mechanism of alpine and cold grassland.
Autumn phenology, commonly represented by the end of season (EOS), is considered to be the most sensitive and crucial productivity indicator of alpine and cold grassland in the Qinghai-Tibetan Plateau. Previous studies typically assumed that the rates of EOS changes remain unchanged over long time periods. However, pixel-scale analysis indicates the existence of turning points and differing EOS change rates before and after these points. The spatial heterogeneity and controls of these turning points remain unclear. In this study, the EOS turning point changes are extracted and their controls are explored by integrating long time-series remote sensing images and piecewise regression methods. The results indicate that the EOS changed over time with a delay rate of 0.08 days/year during 1982-2015. The rates of change are not consistent over different time periods, which clearly highlights the existence of turning points. The results show that temperature contributed most strongly to the EOS changes, followed by precipitation and insolation. Furthermore, the turning points of climate, human activities (e.g., grazing, economic development), and their intersections are found to jointly control the EOS turning points. This study is the first quantitative investigation into the spatial heterogeneity and controls of the EOS turning points on the Qinghai-Tibetan Plateau, and provides important insight into the growth mechanism of alpine and cold grassland.
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