Characteristics of Extreme Climate Change in the Qinling-Daba Mountains and Its Impact on Vegetation Dynamics
[Objective]This study was aimed to understand the spatiotemporal changes in extreme climate and its influence on vegetation.[Methods]Based on daily meteorological data(1960-2020)from 115 weather stations in the Qinling-Daba mountains(QBMs)and surrounding areas and satellite-derived normalized difference vegetation index(NDVI),the spatiotemporal variation characteristics of the NDVI in the QBMs and its response to 19 extreme climate indices were analyzed.Geographic detector was used to identify the contribution rate of extreme climate indices and their influence on the NDVI.[Results](1)The NDVI significantly increased in the majority of the QBMs(80.34％)and decreased in only a few regions(1.09％0 from 2000 to 2020.The interannual change rate in the study area was approximately 0.03/10 a.(2)Noticeable warming was observed in the QBMs from 1960 to 2020,with the temperature increasing more at night than during the day,and regions with a larger change in extreme temperature events were mostly found in the Western Qinling Mountains(WQMs).During the study period,extreme precipitation events showed weak changes,extreme precipitation intensity increased in the southwestern QBMs,while in the eastern QBMs,extreme precipitation intensity decreased but extreme precipitation frequency increased.(3)Extreme precipitation events were the main factor affecting NDVI in the west Qinling region,while extreme temperature events were the main factor affecting NDVI in the Qinling and Daba mountain regions;the impact of extreme climate events on NDVI was not independent,and the interaction between extreme climate indices enhances the impact of a single factor on NDVI in a double-factor or nonlinear way.[Conclusion]The spatiotemporal changes in extreme climate and its influence on vegetation were clarified,which could establish scientific evidence for the protection and restoration of vegetation in the QBMs in response to global climate change.
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