棉花“双种双层”高产栽培技术及其光在冠层中分布的研究

为棉花高产提供理论依据,对棉花"双种双层"冠层结构的光效作用进行了研究。合理的冠层结构对棉花获得高产是非常重要的,"双种双层"是一种利用合理的冠层结构达到高光效利用的棉花栽培技术。它是利用两个具有不同冠层结构的品种及对不同的品种施用不同的农业措施而在田间形成"双层",以达到通风透光实现高产的目的。通过对光在冠层中的分布分析发现,在封垄以前,"双种双层"冠层内的光照强度低于对照;随着冠层的逐步建成,到生长季节的中期,"双种双层"冠层内的光照强度在大部分时间和层次大于对照;到生长季节的后期,冠层结构完全形成以后,"双种双层"冠层内部的光强大于对照的趋势十分明显。同时"双种双层"中的风速大于对照,CO2浓度略高于对照。

A two-cultivar-two-layer planting pattern for high yield cultivation of cottonand and its light distribution in the canopy

An optimal canopy structure is very important for achieving high yield. Two-cultivar-two-layer planting is an effective planting pattern with higher yield for optimal light distribution in the canopy. Two-cultivar-two-layer planting involves two crop cultivars with different shoot architecture to form different layers in the field. Analysis of the light distribution in the canopy showed that in the early season before canopy closure, the light intensity in the different layer of two-cultivar-two-layer was lower than that of normal treatment. But in the late season after canopy closure, the light intensity of two-cultivar-two-layer planting was higher than that of normal treatment. The result indicates that two-cultivar-two-layer planting can intercept more light than normal treatment. Also the wind speed and CO_2 concentration inside the canopy of two-cultivar-two-layer planting were greater than those of CK.