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对梨树光合特性的研究表明,净光合强度多在6—14mgCO_2·dm~(-2)·h~(-1)之间,品种间有极显著差异.光补偿点:早酥梨、茌梨为1-2klx,雪花梨为2—5klx;光饱和点:茌梨、鸭梨及明月梨为40klx,早酥梨、雪花梨及白酥梨为50klx;净光合强度最大时的温度:茌梨为22℃,早酥梨为24℃.梨树一年中光合作用的高峰在7月中旬至8月下旬,一日中的高峰在上午.早酥梨有“午休”现象,光合作用的日变化与单位叶面积的气孔开张数呈板显著线性相关.叶片的净光合强度随叶龄提高而降低.成熟叶的叶绿素含量与净光合强度无线性相关.
Studies on the photosynthetic characteristics of pear tree showed that the net photosynthetic intensity was mostly between 6-14 mgCO 2 · dm -2 · h -1 and there was a significant difference among the varieties. Pear 1-2klx, snow pear 2-5klx; light saturation point: pear, pear and moon pear 40klx, as early as pear, snow pear and white pear 50klx; net photosynthesis temperature at maximum temperature: 茌The pear is 22 ℃, the morning pear is 24 ℃ .The peak of photosynthesis of pear in one year is from mid July to the end of August, and the peak of the morning is in the morning.The morning pear has the phenomenon of “lunch break”, the diurnal change of photosynthesis The leaf photosynthetic rate and net photosynthetic rate were linearly correlated with leaf opening per unit leaf area.The net photosynthetic intensity of leaves decreased with the increase of leaf age.The chlorophyll content of mature leaves had no linear correlation with net photosynthetic intensity.