关键词: 树种, 气候响应, 树木年轮, 抵抗力, 恢复力

Abstract: s temperature continues to rise in northern China, extreme drought events are occurring more frequently and with greater intensity. We examined the response of radial growth of different tree species to extreme drought events in the natural forests of Betula platyphylla, . and Larix principis-ruprechtii. in Mulan Weichang National Forest Farm, Chengde, Hebei. Based on tree ring sampling and measurement, we analyzed their resistance, recovery, and resilience to extreme drought events. The results showed that: (1) The radial growth of B. platyphylla was significantly positively correlated with the average and minimum temperature in February of the current year. The radial growth of P. asperata was significantly positively correlated with the precipitation from April to June and the standardized precipitation evapotranspiration index in May. There was a significant positive correlation between the radial growth of L. principis rupprechtii and the precipitation in June of the current year. (2) The resistance and resilience of B. platyphylla to extreme drought events were significantly greater than that of L. principis-rupprechtii and P. asperata. The recovery of P. asperata was significantly greater than that of B. platyphylla and L. principis-rupprechtii, while there was no significant difference between the latter two. In summary, P. asperata was more susceptible to extreme drought, followed by L. principis-rupprechtii and B. platyphylla. This study can provide theoretical reference for predicting the ecological adaptability and development trends of B. platyphylla, P. asperata, and L. principis rupprechtii in Mulan Weichang National Forest Farm under future climate change.

Key words: tree species, climate response, tree ring, resistance, recovery