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用改进半叶法测定鸭梨不同部位叶片和不同枝类叶片不同时期的光合速率。结果表明，９年生密植鸭梨外围新梢叶和短枝叶的光合速率分别为１６．７３～３３．７３和１３．５６～２５．７４ｍｇＣＯ２ｄｍ－２ｈ－１，内膛短枝叶的光合速率为４．５５～９．９０ｍｇＣＯ２ｄｍ－２ｈ－１。５月下旬至８月下旬的两年连续测定表明，盛果期大树外围新梢叶的光合速率高于外围短枝叶。短枝叶的光合速率在５月份呈现最高值，６月份及以后有所降低，至８月底下降幅度不显著。
Determination of photosynthetic rate in leaves of different parts of pear and branches of different branches by improved half leaf method. The results showed that the photosynthetic rate of shoots and short branches in the periphery of 9-year-old peanut pear was 16.73-33.73 and 13.56-25.74 mgCO2dm-2h-1, respectively. The photosynthetic rate of short-leafed internals was 4. Two consecutive years of 55 ~ 9.90mgCO2dm-2h-1.5 in the end of August and late August showed that the photosynthetic rate of shoots outside the tree periphery was higher than that of the peripheral short branches in full fruit stage. Short leaf photosynthetic rate in May showed the highest value in June and later decreased, by the end of August decline was not significant.