The effects of climate warming on mainly plant phenological phase of North Qinling Mountains-in xi'an as an example

摘要

To reveal the influence of the temperature changes on plant phenology,The phenological data and temperature log data nearly 50 years in Xi 'an station was used to research the relationship between the temperature and phenological responses, which combined with mathematical statistics methods such as Julian day, correlation coefficient , the results showed: (1) 1962-2009, The temperature of beginning phenological period, phenological late and growth period are on the rise, of which the temperature of beginning phase increased most obviously;;(2) The M - K mutation test the mutation in Xi 'an annual average temperature of the year is 1995, the beginning and end of phenological mutation and the growth period is: 1998, 1997 and 2003;;(3) Xi 'an plant phenology beginning period in advance, growth period prolonged, the end period delayed, there is an upward trend in temperatures in different historical periods;;(4) The temperature mutations showed the trend of ahead, the beginning phenological period before and after the end of phenological showed a trend of later, after the end of the degree to which were greater than the extent of the beginning period in advance, and after the mutation of phenological change trend mutations were greater than before, that means the temperature rising added plant phenological period of delay, and extend the ahead of time.