玉米是C_4植物,具有高光效特性。因而从生理上讲,玉米产量应该大大超过其他属于C_3植物的作物。但是,实际上目前玉米的最高产量只不过稍高于水稻。为了弄清为什么玉米产量不能达到预期的高值,我们有必要对目前较高栽培水平下限制玉米产量的环境因素和生理因素加以分析,探讨其高产潜力究竟如何,及克服产量限制因素的可能途径,从而使产量进一步提高。 Corn is a C_4 plant with high luminous efficacy. Physically, therefore, maize yields should outperform other crops that are C_3 plants. However, at present, the maximum yield of corn is only slightly higher than that of rice. In order to understand why maize yields do not reach the expected high values, it is necessary to analyze the environmental and physiological factors that currently limit maize yields at higher cropping levels, to explore what their potential for high yields and possible ways of overcoming their yield-limiting factors , So that further increase in production.