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旱地果园秸秆覆盖对红星、新红星苹果树光合速率日变化影响的研究表明：秸秆覆盖树与对照树光合速率的日变化趋势一致，均呈双峰曲线，但覆盖树的光合速率总是高于对照树。７～１９时，红星苹果覆盖树的平均光合速率比对照树高２４．８３％，新红星苹果覆盖树的平均光合速率比对照树高６８．２３％，说明秸秆覆益可以显著提高苹果树对ＣＯ２的日同化量，对短枝型新红星进行秸秆覆盖比对普通型红星苹果具有更显著的效果，午前（７时，９时）和午后（１７时．１９时）红星和新红星苹果树无论覆盖或对照，均以气温和光强对光合速率的影响最大，而午间（１１时，１３时，１５时）各环境因素对苹果树光合速率的相对重要性因品种和处理不同而异。
The results showed that the diurnal variation of photosynthetic rate of straw mulching and control trees was the same, showing a bimodal curve, but the photosynthetic rate of the mulching tree was always higher than that of the control Control tree. From July to 19, the average photosynthetic rate of Red Star apple-covered trees was 24.83% higher than that of the control trees. The average photosynthetic rate of new-star apple-covered trees was 68.23% higher than that of the control trees, indicating that straw mulching could significantly improve apple tree CO2 daily assimilation amount, the stalk coverage of spur-star new red star had more significant effects than the common-type star apple. Before midday (at 7 o’clock and 9 o’clock) and afternoon (at 17 o’clock and 19 o’clock), Red Star and New Star apple tree Both cover temperature and light intensity had the greatest effect on photosynthetic rate regardless of coverage or control. However, the relative importance of various environmental factors to the photosynthetic rate of apple trees at midday (at 11 o’clock, 13 o’clock and 15 o’clock) varied with different varieties and treatments.