紧凑型夏玉米群体光合特性与产量关系分析

Relations of Grain Yield and Photosynthetic Characteristics on Upright-leaf Summer Corn(Zea mays L. )

通过对高产条件下紧凑型夏玉米不同生育时期群体光合特性与同化产物积累量、籽粒产量及产量构成因素间的灰色关联分析,明确了籽粒产量在吐丝以前各生育时期与叶面积系数关系最为密切,在吐丝以后的各生育时期主要依赖于同化产物的积累,各生育时期同化产物的积累则主要同叶面积系数密切相关,叶面积系数、光合势和净同化率对籽粒产量的关键作用时期为吐丝至吐丝后15天.同化产物积累量对籽粒产量的决定作用随生长发育的进行而逐渐增大.在产量构成三要素中,单位面积穗数与拔节至吐丝期间的叶面积系数关系最为密切;穗粒数和千粒重则主要依赖于大喇叭口期或吐丝期以后的同化产物积累.

In this paper, the relations of mass accumulation, grain yield and yield components with photosynthetic characteristics during different development stages were analysed by using Gray Relation Analysis. The results showed that grain yield was closely related to LAKLeaf Area Index)hefore silk emergence,and then mass accumulation had the strongest effect on grain yield. Among the photosynthetic characteristics, LAI was the most important factor in determining mass accumulation at every development stage. The most effective stage in which LAI,LAD(Leaf Area Duration )and NAR (Net Accumulation Rate) had effects on grain yield was in about 15 days after silking stage. Relations of yield components and photosynthetic characteristics were also analysed.