The Impact Of Climate Climate Change On Woody Plants Phenology In Recent30Years In Hohhot

Phenology is one of the major indicators of climate change. The research on phenological response is an important part of the environmental variation. This passage aims to analyze the phonological variation of Hohhot and the impacts of the correlation between meteorological factors and18species of woody plants phenophase dates during1979-2011in Hohhot.The study shows:1.In Hohhot, The adjacent continuous phenophases of plants generally show a strong positive correlation. Especially for several phenophases of flower, for example, the beginning and blossom of Prunus armeniaca both reach the significant positive correlation. However, only the special case of one plant mainly shows the significant negative correlation combinations which counting for little.2.Between different phenophases of different plants have some correlations. The ratio showing significant positive correlations (the average rate of fifteen plants is13%) are higher than significant negative correlations (the average rate of fifteen plants is7%). However, the phenophases in autumn reveal that the ratio of positive correlation is a little bit higher than those in spring. The statistics shows that these significant positive correlation combinations generally belong to the same phenophase. 3.In Hohhot, the spring phenophase of plants are generally brought forward with the temperature to high, but autumn phenophase generally tend to postpone. According to different time division, there still has obvious regular patterns, in the case of Syringa oblata, whos average anthesis had advanced1.7days ahead of time from the1980s to the1990s, and4.4days from the1990s to the2000s. between temperature and woody plants phenophases have a strong correlations. The spring phenophase of plants relates to temperature, therefore sprouting new leaves and the temperatures of March and April take on significant negative correlations, the same as first-flowering.4.The temperature of Hohhot between March and April increases1degree centigrade, the phenophase of plants would be ahead of time. For instance, the first-flowering of Acer negundo will be ahead for about5.09days, Prunus persica will be ahead of about2.58days, Rosa rugosa will be ahead of about2.77days, Rosa xanthina will be ahead of about3.45days, and Syringa oblate will be ahead of about3.26days. Strong correlation combinations can be used for interpolation or predication, and there is no difference between theoretical and actual value.5.The Hohhot’s phenology of four seasons as a whole show the regular patterns which is short in spring and autumn, and long in winter and summer, each as a distinctive feature. Through phenology calendar, it can be seen that the phenophases of Hohhot change obviously as time goes, which shows that changes become earlier in spring and summer and later in autumn and winter, especially they are shortened in winter and increased in summer.