棉花群体冠层PAR与农艺性状及产量的关联性研究

STUDIES ON THE ASSOCIATION OF CANOPY PAR WITH AGRONOMIC TRAITS AND LINT YIELD IN COTTON (G. hirsutum L.) POPULATION

本文研究了陆地棉品种徐州553三种密度群体冠层PAR的分布规律、PAR与农艺性状及产量的关联性。结果表明:(1)棉田冠层PAR随密度增加而递减;冠层PAR值的高低随生育期变化的顺序是初花期>盛花期>吐絮期>盛铃期。(2)棉田封行后,冠层PAR的垂直分布符合Y=axe^(bx)曲线变化规律。(3)PAR对结果系数、NAR、果枝与主茎夹角、单株果枝数、单铃重和成铃率的直接效应为较大正值,对主茎节距、第一果枝高度、总果节数为较大负值。(4)PAR与皮棉产量(Y)的关系可由Y=a十bx+cx^2拟合,且曲线拟合的理论值与实际值差异小于1％。这些结果丰富了棉花光能利用的理论研究,也为合理密植、改善棉田光能分布以增加产量提供了理论依据。

The study was carried out on the experimental farm of Anhui Agricultural College from 1987 to 1988. The characters studied involved canopy PAR, 15 agronomic traits and tint yield of Xuzhou 553 cultivar in 3 densities (28570, 57140 & 85710 plants per ha respectively), to investigate the change of canopy PAR and relationship of PAR with the above characters. The results indicated as follows: 1. The canopy PAR reduced with increasing density, and the changing regulation of PAR with growth stage was early flowering stage>peak flowering period>opening period>peak boiling period at the same density. 2. The vertical distribution of canopy PARwas described by the curve Y=axe^(6x) (here x=height of canopy away from the ground) after flowering period, r=0. 9106-0.9967. 3. There was the important association between PAR and plant type, physiological trait and yield component, the regression equation of PAR(x)with lint yield(y) was y=a+bx+cx^2, r=0.9936～0.9945, the variance between the actual value and forecast value of lint yield<1%.