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在玉米生育期内测定了０～１００ｃｍ土层土壤空气组成、土壤通气状况的呼吸强度．结果表明，裸地上壤空气中ＣＯ２浓度为０．１％～１．６％，覆膜处理为０．２～１．８％，平均比对照高３２．３９％，尚在作物生长适宜范围内．土壤Ｏ２含量与ＣＯ２浓度变化成负相关（裸地ｒ＝０．９２，地膜ｒ＝０．７９），裸地的Ｏ２浓度变化范围为１３％～１８％，覆膜上红为１１％～１７％，覆膜低于裸地４．９６％．Ｎ２含量差异不显著．土壤呼吸强度与土壤深度呈幂函数关系，０～２０ｃｍ耕层内，覆膜土壤明显高于裸地．覆膜对土壤结构有明显影响，与裸地相比，大团聚体（＞０．２５ｍｍ）和０．０１～０．００１ｍｍ粒级微团聚体含量减少，表层０～１０ｃｍ土壤总孔隙度、气相率和通气孔隙度分别增加９．９３％、２４．５６％和３２．３０％．
During the growth period of maize, the air composition and soil respiration of 0-100 cm soil layer were measured. The results showed that the CO2 concentration in the bare soil air was 0.1% ~ 1.6% and the film mulching treatment was 0.2 ~ 1.8%, averagely 32.39% higher than that of the control, which was still within the appropriate range of crop growth . The content of O2 in soil was negatively correlated with the change of CO2 concentration (r = 0.92 in bare land, r = 0.79 in mulch), and the O2 concentration in bare land varied from 13% to 18% %, 4.96% less than bare land. N2 content difference is not significant. The soil respiration intensity showed a power function relationship with soil depth. Within the 0-20 cm layer, the soil layer was significantly higher than bare soil. Compared with bare land, the content of macroaggregates (> 0.25mm) and 0.01 ~ 0.001mm fraction microaggregates decreased, the total porosity of 0 ~ 10cm soil surface, Rate and aeration porosity increased by 9.93%, 24.56% and 32.30% respectively.