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春季不同部位叶片发育差异大.而且呈明显规律性.轻度干旱促进各类叶片成熟;严重干旱使长枝基部叶和短枝叶急剧衰老、游离氨基酸积累、内源乙烯大量释放、叶片脱落,但对长枝中部叶的发育影响不大;能促进长枝上部叶的成熟.可见,春季干旱落叶是衰老的结果.春季干旱,对不同部位叶片衰老和脱落的影响与其自身发育的差异有关,因此形成了春季干旱落叶的局部性.
In different parts of spring, the leaf development was quite different, but the regular pattern was obvious. Mild drought promoted the maturation of all kinds of leaves. Severe drought led to the rapid aging of base leaves and short branches, accumulation of free amino acids, release of endogenous ethylene and leaves fall off, Which has little effect on the development of leaves in the middle part of long branches and can promote the maturation of the upper leaves in long branches.It can be seen that the dry leaves in spring are the result of senescence.The effects of spring drought on the leaf senescence and shedding in different parts are related to their own developmental differences The formation of spring drought deciduous local.