Abstract This paper studied the effects of 3 pruned methods(2 stems,3 stems and 4 stems pruned method)on
photosynthetic gas exchange parameters,transpiration and distribution pattern of assimilate.The result showed that
net photosynthetic rate(Pn),stomatal conductance(Gs),stomatal limitation value(Ls),transpiration rate(Tr)and water
use efficiency(WUE)were in upper leaves>in middle leaves>in lower leaves under 3 pruned methods.In middle or lower
leaves the decrease of Pn was considered as a result of non-stomata restriction.Compared with 2 stems pruned
method,the Tr in upper or middle leaves,and WUE in lower leaves of 3 or 4 stems pruned method increased.Under 3
pruned methods,the distribution pattern of assimilate to fruits was the highest,the next was to stems and leaves,and
the distribution of assimilate to root was the lowest.Compared with 2 stems pruned method,per plant yield and weight
of single fruit of sweet pepper were significantly increased under 3 or 4 stems pruned method.
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