摘要
Based on the analysis of phenological variation characters of Populus simonii in spring and autumn in Liaohe River Delta during 1989-2009,the relationship model between phenophase difference and temperature variation was constructed,and the responses of phenophase to the changes of temperature and critical temperature duration were analyzed under the background of climate change.The results showed that spring phenophase in Liaohe River Delta in recent 21 years occurred a little earlier without obvious trend feature,and spring phenophase change was mainly affected by temperature fluctuation,with the nonlinear relationship between them.Meanwhile,autumn phenophase was significantly delayed and mainly determined by the time of temperature dropped to a certain index.
Based on the analysis of phenological variation characters of Populus simonii in spring and autumn in Liaohe River Delta during 1989-2009,the relationship model between phenophase difference and temperature variation was constructed,and the responses of phenophase to the changes of temperature and critical temperature duration were analyzed under the background of climate change.The results showed that spring phenophase in Liaohe River Delta in recent 21 years occurred a little earlier without obvious trend feature,and spring phenophase change was mainly affected by temperature fluctuation,with the nonlinear relationship between them.Meanwhile,autumn phenophase was significantly delayed and mainly determined by the time of temperature dropped to a certain index.
