玉米不同品种间作增产机制

以辽单526、丹玉39和沈玉213个品种为试材,采用高矮秆品种搭配组成两个间作试验组,比较了间作与单作的产量、群体结构、生理指标和田间小气候等。结果表明:玉米不同品种的合理间作有显著的增产效果。间作增产的主要原因在于群体结构的改善。高矮间作形成的立体结构即波浪式冠层使群体受光面积增加、光照增强,冠层内通气性改善、C02浓度提高,在光合速率、叶面积、株高、叶绿素含量等方面也都有不同程度改善,提高了光能利用率。

Mechanism of Yield-Increasing in Different Height Maize Cultivars Inter-planting System

Three different maize cultivars including Liaodan526,Danyu39,Shenyu21 were used as experimental materials and a comparison of yield,community structure,physiological index,field microclimate between inter-planting and monoculture was approached according to two different inter-planting groups which collocated two maize cultivars that have a difference in height.The study indicated that the reasonable inter-planting of different maize cultivars could enhance the yield remarkably.It also showed that the improvement of the community structure is the main reason that made the inter-planting community's yield increased.The tridimensional structure of the inter-planting community had a great effect on the surface of accepting light,the sunlight irradiation,the ventilation of the canopy and the concentration of carbon dioxide in the field.The inter-planting community also improved the photosynthetic rate,leaf area,plant height and chlorophyll content in some extent,and therefore enhanced the utilization rate of sunlight energy.