[Responses of radial growth of to different droughts over the northeastern Tibetan Plateau, China].

To study the responses of radial growth of to climate factors of the different periods (pre-growing season (February-April), growing season (May-July)), and the vulnerability (resistance, ; recovery, ) of to different drought events (precipitation, temperature and the both caused), we used tree ring width data of from 17 sampling sites across the northeastern Tibetan Plateau to analyze the correlation between radial growth and climate factors of different periods, and the vulnerability in different drought events. The results showed that radial growth of had significant positive correlation with drought index and negative correlation with temperature in the growing season (<0.1). The vulnerability of to drought events of different periods had significant difference. In the pre-growing season drought events, the of at low altitude was 2.3% higher than that at high altitude, the of at low altitude was 25.1% lower than that at high altitude. For drought events in the growing season, the of at low altitude was 23.7% lower than that at high altitude, the of at low altitude was 107.1% higher than that at high altitude. The mean (1.68) of in precipitation-caused drought events was strong, while the mean (1.43) of in temperature-caused drought events was strong. The growth of , especially for that at low altitude, would be largely limited by drought caused by global warming in the future.