The Impact Of Climate Change On Main Plant Phenology In Benxi Country

Study on the impact of climate change on plant ecosystem is paid attention by more and more scientists in recent years, which plant phenology response research on climate change is one of hot issues at present. Changes of plant phenology directly reflects the change of climate, especially climate warming. Scientists attend very early to that plant phenology as the inductor of influence of climate change on ecology has the characteristic of sensitive, easy to monitor and comprehend,also it is important parameter of vegetation productivity and vegetation dynamics modeling.This paper selects main plant species in Benxi country, including woody plants (apricot and Canadian poplar) and herb plants (plantain and dandelion). Statistic method is applied to analysis the impact of temprature, precipitation and sunshine on main plants phenology for the period of 1980~2004 in Benxi of Liaoning, and it is found out that temperature is the main factor to significantly influence first-flowering phenology,Then the correlation among growing-season length and average temperature is discussed.It is showed that temperature influences first-flowering dates the most, sunshine does less and precipitation does the least. Temperature rising and the increase of sunshine hours lead to an advance of first-flowering dates while increase of precipitation makes them delay. Temperature in spring and late winter mainly influence first-flowering dates, and higher temperature causes earlier first flowering dates. The observed trend of annual and ten-year fluctuation in flowering phenology corresponds well with temperature in spring. In general, a deviation from temperature is bigger than that from phenology.Temperature in early spring mostly influences growing-season length, and temperature in late autumn does in a certain degree. The increase of temperature in spring causes the advance of growing season, as the increase in late autumn and winter leads to a delay. Thus the length of whole growing season is relatively prolonged, and the advance of spring phonological is the main factor.