摘要: Climate warming has advanced the biological spring and delayed arrival of winter ( 1 , 2 ). These changes in annual cycle plants lengthening green-cover season have many consequences for ecological processes, agriculture, forestry, human health, global economy 3 Studies on vegetation-atmosphere interactions 4 ) particularly impact leaf emergence climate 5 – 9 suggest that phenological shifts turn affect climate. The magnitude sign this effect are unknown but depend water availability regional characteristics.