Abstract: The responses of apple tree growth to climate change in Longdong loess plateau were analyzed,based on observed phonological data from 1984 to 2007,apple yield data from 1986 to 2007,and meteorological data from 1961 to 2007 at Xifeng and Kongtong station in Gansu province.The results showed that apple tree growing stages,such as leaf bud opening and flowering,advanced,while maturity postponed,so the whole growth season of apple tree was extended.The meteorological conditions during whole growth season of apple trees became warmer and drier,especially during flowering period.The main meteorological factors that influenced apple yield in Kongtong were the minimum temperature in April and July to August,precipitation in early January,and sunshine hours in early June.These factors varied differently with climate changed,and affected apple yield in differently too.It's necessary to take some measures such as adjusting distribution of planting areas,strengthening field management,to adapt to climate change in the future.

Key words: Longdong loess Plateau, Longdong loess Plateau, Apple phonology, Apple yield, Climate change