【摘要】 <正> 二氧化碳是光合作用的原料。环境中CO₂供应是否充足,对作物的光合和产量有很大的影响。晚茬麦地膜覆盖栽培,改善了小麦赖以生存的环境条件,特别是膜下CO₂浓度的变化,对小麦的正常生长发育至关重要。因此,探讨覆膜麦膜下CO₂浓度的变化规律,对晚茬麦高产理论研究具有重要意义。更多还原

【Abstract】 Under film covers of wheat, the variatioa treads of CO₂ concentration are similar despite of different sowing time, old or new plastic films, or sunny or cloudy days. The diurnal course of CO₂ concentration can be divided into 3 stages: gradual rise, straight line drop and cyramic equilibrium. There will be lack of CO₂ in varying degrees when it is below the(ynamic equilibrium. Increasing CO₂ concentration under plastic films will great（?）y promote the photosynthesis and yield of late （?）owing wheat.更多还原