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地膜覆盖穴播小麦在拔节期、孕穗期和灌浆期的日平均光合速率分别比对照高23．3％、33.1％和12．7%。在拔节期光合速率日变化为单峰型，而在孕穗期和灌浆期则为双峰型。净同化率比对照高0．38g/（m2·d）和0.23g/（m2·d）。地膜覆盖穴播小麦具有叶面积大．光合“午睡”现象轻和干物质积累多的特点。光合速率高低与气孔阻力有关。覆膜小麦表现为气孔阻力低于对照，这有利于植株叶片气体交换和光合能力的提高，其主要原因是全生育期覆膜小麦的土壤水分供应状况好于露地。
The daily average photosynthetic rate of mulching wheat under jointing, booting and filling stages were 23.3%, 33.1% and 12.7% higher than that of the control respectively. Diurnal variation of photosynthetic rate at jointing stage was unimodal, but bimodal at booting and filling stages. The net assimilation rate was 0.38g / (m2 · d) and 0.23g / (m2 · d) higher than the control. Mulch-covered wheat has a large leaf area. Photosynthetic “nap” phenomenon of light and more accumulation of dry matter characteristics. The photosynthetic rate is related to stomatal resistance. The results showed that the stomatal resistance of the mulched wheat was lower than that of the control, which was in favor of improving the gas exchange and photosynthetic capacity of the leaves of the mulched wheat. The main reason was the better soil moisture supply of mulched wheat during the whole growth period.