以6年生幼龄‘桂味’荔枝(Litchi chinensis Sonn.‘Guiwei’)为试材,于5月果实发育期,从螺旋环剥处理和对照树上分别选取来自同一基枝的有果枝和无果枝,观察枝梢生长的情况并进行叶片光合和蒸腾作用的研究。结果表明:螺旋环剥有利坐果;螺旋环剥缩小有果叶与无果叶在光合效率上的差别,显著降低了叶片的最大光合速率(Amax)、表观量子效率(AQY)和羧化效率(CE),提高了光补偿点(LCP),削弱了光合效率;净光合速率(Pn)与蒸腾速率(Tr)极显著相关,螺旋环剥显著降低了叶片的Tr,Pn也下降但差异不显著,蒸腾作用减弱的程度比光合作用减弱的程度大;对照叶片的Pn和Tr日变化为单峰曲线型,14:00时达最高峰,螺旋环剥叶片的Pn和Tr在13:00时有明显的午休现象,气孔限制是午休的主要因素;相同处理的有果枝叶片,其日均Pn和Tr都高于无果枝叶片,说明果实的存在可提高‘桂味’荔枝的Pn和Tr。 Six-year-old young “Guiwei” litchi (Litchi chinensis Sonn.’Guiwei ’) were used as experimental material to select the fruiting branches from the same root branch and no Fruiting branches, observe the growth of shoots and leaf photosynthesis and transpiration. The results showed that: Spiral girdling benefited fruit setting; Spinning ring pared the difference between photosynthetic efficiency of small and no fruit leaves, significantly reduced the maximum photosynthetic rate (Amax), apparent quantum yield (AQY) and carboxylation efficiency (CE) increased the LCP and weakened the photosynthetic efficiency. The net photosynthetic rate (Pn) was significantly correlated with the transpiration rate (Tr), and the spire girdling significantly decreased the Tr and Pn in the leaves but the differences were not significant Significantly, the degree of transpiration weakened more than that of photosynthesis. The diurnal changes of Pn and Tr in control leaves were unimodal and reach the peak at 14:00. The Pn and Tr of the leaves of Spiraeologica were at 13:00 There was a clear phenomenon of lunch break. Stomatal limitation was the main factor of lunch break. The average daily Pn and Tr of the fruit leaves with the same treatment were higher than those of the fruitless leaves, indicating that the fruits could increase the Pn and Tr of the ’Guiwei’ litchi.