科研之友
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摘要
Objective: The study was intended to explore the response of radial growth of Abies forrestii and Picea likiangensis to climate factors in the central Hengduan Mountains. In order to provide some basic data for further reconstruction of the history of climate change in Southwest China and to provide a theoretical basis for modelling species distribution and conservation of A. forrestii and P. likiangensis in the context of global climate change.Method:Based on dendroclimatological methods, we established standard chronologies of A. forrestii and P. likiangensis, which are dominant species in the Small Zhongdian area in Shangri-La County of Yunnan Province. Relationship between the two standard chronologies and climatic factors in the central Hengduan Mountains, Southwest China was analyzed.Result:The responses of the two tree species to climate factors were different, and A. forrestii was more sensitive, and hence more suitable for dendroclimatological studies; Response function coefficients indicated that air temperature had a significantly stronger restraining effect on A. forrestii than on P. likiangensis; The radial growth of A. forrestii positively correlated with the mean air temperatures in the previous November and current August (P <0.05), positively correlated with the maximum air temperature in the previous November and current April (P <0.05), positively correlated with the minimum air temperature in the previous May (P <0.05), positively correlated with precipitation in the current March (P <0.05); Spatial correlation analysis revealed that variations in standard chronology of A. forrestii could reflect the change of the minimum air temperature in the previous November, and the highest correlation with climate factors occurred in the vicinity of the study area; In the future, global warming will promote the radial growth of the two species; Meanwhile, the coupling effects of large-scale atmospheric-oceanic-land variability may affect the radial growth of A. forrestii and P. likiangensis in the central Hengduan Mountains.Conclusion:At the high altitudes in the middle of the central Hengduan Mountains, air temperature is the main climate factor limiting the radial growth of A. forrestii and P. likiangensis, and the response of radial growth of the two tree species to climate factors shows some differences, which also shows that it has great potential to study the population growth dynamics and its response to climate change by using tree-rings.
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