## 5 Conclusions  
We investigated time-invariant and time-variant (interannual) vegetation sensitivity in response to temperature, solar radiation, and water availability on the QTP over the last two decades by considering four vegetation proxies, including LAI, EVI, NDVI, and SIF products. Except for LAI, the other three vegetation proxies provided strongly consistent evaluations regarding the interannual vegetation dynamics and vegetation sensitivity in response to climate change. Overall, the vegetation dynamics indicated by the four vegetation products all showed increasing trends over the last two decades, as pixels with an upward trend value accounted for 69%, 77%, 79%, and 81% of the total pixels for the EVI, SIF, LAI, and NDVI data, respectively. The greening trend gradually decreased from the eastern to western QTP, and pixels with a negative trend were clustered in southern and southwestern areas of the QTP. Compared with those of the other three vegetation proxies, SIF data indicated a widespread decreasing trend for grasslands located in the southwestern QTP.  
Trend analysis revealed that temperature exerted positive impacts on vegetation, but vegetation of the QTP displayed a decreasing sensitivity to temperature. Solar radiation was shown to have a positive impact on forests, while it had negative impacts on grasslands and BSVs. Grasslands and BSVs exhibited decreasing sensitivity, while forests showed increasing sensitivity to solar radiation. As for water availability, forests and BSVs exhibited increasing sensitivity, but no obvious trend was observed for grasslands. Water availability exerted positive impacts on grasslands and BSVs, and no obvious impact direction could be determined for forests. The spatial patterns of the dominant climate factors were similar for time-invariant and time-variant vegetation sensitivity. In general, temperature is the most important driving factor, followed by solar radiation and water availability. Temperature and solar radiation jointly dominated the vegetation sensitivity in central to eastern areas of the QTP. By contrast, water availability was the dominant factor regarding vegetation sensitivity in forests in the southeastern QTP and in grasslands in northeastern and south western areas of the QTP. Our findings have important implications for understanding response and feedback associated with climate change in the vegetation dynamics on the QTP, providing a baseline for vegetation preservation and management for policymakers.  
Conceptualization, K.W. and Z.H.; methodology, K.W.; software, K.W.; formal analysis, H.Y.; investigation, J.C.; resources, K.W.; data curation, Y.Y.; writing--original draft preparation, K.W. and J.C.; writing--review and editing, K.W. and H.Y.; visualization, Y.Y.; supervision, K.W. and Z.H.; project administration, K.W., Y.Y. and Z.H.; funding acquisition, K.W., Y.Y. and Z.H. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Second Tibetan Plateau Scientific Expedition and Research Program (2019 QZKK0405), the Hainan Provincial Natural Science Foundation of China (623 RC447, 423 QN208), and the Hainan University start-up fund (KYQD(ZR)-22084, KYQD(ZR)21096, RZ2200001144). Key RGD Program of Hainan (ZDYF202 SHZF042).  
The data presented in this study are available on request from the corresponding author.  
The authors declare no conflict of interest.