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本试验采用层切法研究地膜覆盖和露地两种种植方式玉米的冠层结构和根层结构。认为地膜覆盖种植玉米（以下简称及覆膜玉米）与未覆膜（露地）玉米相比．具有较高的叶面积和较为合理的群体光分布，较强的干物质积累能力，较高的粒叶比以及较发达的根系等优点．从而有利于高产。
In this experiment, the canopy structure and root structure of maize with plastic film mulching and open field planting were studied by stratum cut. It is considered that the mulching of corn (hereinafter referred to as mulched corn) is compared with uncoated (mulching) of corn. With higher leaf area and more reasonable population light distribution, strong dry matter accumulation ability, higher grain-leaf ratio and more developed root system and so on. Thus contributing to high yield.