本文主要研究了吉林省梨主栽品种“苹果梨”田间条件下光合强度的变化规律。结果表明,“苹果梨”光合强度在7～16mgCO_2dm~(-2)h~(-1)之间,光补偿点为2klx,光饱合点为53klx。生长季中光合强度6月旬中达到高峰并一直持续到7月末。一日间的光合强度依光照强度和温度而变化,呈现出“正规曲线型”和“午睡型”。 In this paper, we studied the changes of photosynthetic intensity under the field conditions of pear variety “apple pear” in Jilin province. The results showed that the photosynthetic intensity of apple pear was between 7-16mgCO_2dm -2 h -1, the light compensation point was 2klx and the light saturation point was 53klx. The photosynthetic intensity of the growing season peaked in mid-June and continued through the end of July. The photosynthetic intensity of the day varies with the light intensity and temperature, showing a “regular curve type” and a “nap type.”