Abstract:

The response patterns of growing period and phenological period duration of 7 woody species to climate warming in Southwestern Shandong province were analyzed using a statistical analysis method. The results show that the temperature is in a significantly increasing trend (p<0.01). Under the conditions of climate warming, the spring phenological period interval of woody plants is shortened; the autumn phonological period interval is prolonged, so is growing period. Growing period is obviously longer than phenological period duration. The duration of leaf expansion is negatively correlated with temperature of last month and this month as well as subsequent monthly mean temperature. Correlation between duration of leaf expansion of Firmiana simplex and temperature of current month is significantly negative (p<0.01), while correlation between duration of flowering of Salix matsudana and robinia pseudoacacia, and subsequent monthly mean temperature is positive (p<0.05). The duration of leaf color changing and leaf falling is positively correlated with temperatures of last month and current month as well as ending month, and subsequent monthly mean temperature. Among them, the significant correlation between Salix matsudana and the temperature is also found (p<0.05). The growing period of woody plant is positively correlated with temperature, and the growing period of Salix matsudana is more sensitive to climate warming, following by those of Ulmus pumila、Firmiana simplex and Melia azedarach, The plant growing periods will be prolonged 3.0-20.0 days, 5.0-14.0 days and 2.0-18.0 days when annual mean temperature, annual mean maximum temperature and annual mean minimum temperature increase by 1℃, respectively.

Key words: Growing period, phenological period, Climate warming, Woody plant