| In recent years,with the continuous changes in global temperature,the study of plant phenology has attracted more and more attention.The direct response of plants to global climate change is the change in plant phenology.Plant phenology is used as a sensor for climate change.Changes in global climate can cause changes in plant growth rhythms.The northeastern region is the concentrated distribution area of the two vegetation types in temperate coniferous and broad-leaved mixed forest and cold temperate coniferous forest,which belongs to the northern hemisphere high latitudes which have the most significant impact on global warming.The northeastern region is located in high latitudes of our country and is particularly sensitive to climate change.Through the analysis of the meteorological data of Harbin from 1963 to 2014,it can be seen that in 52 years,the warming in Harbin is obvious,the change of precipitation is very fine,the number of sunshine hours is reduced,the relative humidity is reduced and the vapor pressure is increased.In this paper,some woody plants in the forest botanical garden of Heilongjiang Province and the phenological observation of 52 years from 1963 to 2014 were analyzed by R language.The effects of climate change on the fruit ripening period of 49 species of woody plants in Heilongjiang Province were analyzed.The results showed that there were 40 species of woody plants in the correlation with the change of temperature,29 of them had negative correlation with the increase of temperature.With the increase of temperature,the fruit ripening period was advanced.The plant was positively correlated with the temperature change,the temperature increased,and the fruit ripening was delayed.There were 38 species related to changes in water vapor pressure,24 of which were negatively correlated with changes in water vapor pressure,increased water vapor pressure,and early fruit ripening.14 species of woody plants were positively correlated with changes in vapor pressure,Increased pressure,fruit maturity delayed.There were 18 species of woody plants associated with relative humidity,11 of which were positively correlated with relative humidity rise and 7 were negatively correlated with elevated relative humidity.There are only 10 species associated with precipitation,only six species associated with sunshine hours,and changes in precipitation and sunshine hours only affect a small number of species.For different species,the change of climate has different effects on fruit ripening.The correlation between temperature and water vapor pressure was significant for most species,and the relative humidity was the second,and the correlation between precipitation and sunshine hours was the least.On the basis of correlation,the response of fruit ripening period to temperature and vapor pressure was analyzed.Among the responses of fruit ripening and temperature,36 species of woody plants responded to the increase of temperature.Among them,81%(29/36)of the species had advanced fruit ripening period of 3.05 d because of the increase of temperature / ℃ ~ 8.34 d / ℃;19%(7/36)of the species due to the temperature rise of fruit ripening delay,the delay rate of 2.33 d / ℃ ~ 6.29 d / ℃.Among the responses of fruit ripening and water vapor pressure,31 species responded to changes in water vapor pressure.71%(22/31)of woody plants increased with the increase of water vapor pressure,and the fruit ripening period was advanced,The maturation period of the woody plants at 2.43 d / hPa ~ 5.83 d / h Pa and 29%(9/31)increased with the increase of water vapor pressure.The delay rate ranged from 1.75 d / hPa ~ 4.53 d / HPa.The increase in temperature and vapor pressure will cause the fruit ripening of most of the woody plants to be advanced,and a small number of species will delay the fruit ripening due to the increase in temperature and vapor pressure. |
