不同水肥优化模式下冬小麦叶片生长及群体光分布研究

Effects of The Different Irrigation-Fertilization Optimization Models on Leaf Growth and Population Light Distribution of Winter Wheat

试验结果表明,与传统水肥相比较,传统灌溉-优化施肥冬小麦主茎上四叶叶片短小叶面积减少,叶片相对较厚,叶倾角大,株型紧凑,消光系数小,冠层各层透光率较高;优化灌溉-传统施肥冬小麦主茎上四叶叶片变长叶面积增加,叶片相对较薄,叶倾角小,株型较为披散,消光系数大,冠层各层透光率较低;优化水肥及秸秆还田优化水肥冬小麦主茎上四叶叶面积略微减少,叶片厚度、叶倾角、消光系数及各层透光率与传统水肥差异很小,株型较好;各处理间经济产量无显著性差异。

As compared with the traditional irrigation-traditional lertilization, the following results were ob-lainecl-lhe improved traditional irrigation-optimized fertilization: shorter and thicker flag leaf, 2nd leaf, 3nd leaf and 4nd leaf from top, reduced total area of these leave, bigger mean canopy leaf tilt angle, tighter plant type, smaller light extinction coefficient (K), higher ratio of light penetration in the upper, middle and lower parts of the wheat canopy; the improved optimized irrigation-traditional fertilization; longer flag leaf, 2nd leaf, 3nd leaf and shorter 4nd leaf from top, increased total area of these thinner and looser leaves, smaller mean canopy leaf tilt angle, looser plant type, greater light extinction coefficient . lowerer ratio of light penetration in the upper, middle and lower parts of the wheat canopy; the improved optimized irrigation-optimized and the improved optimized irrigation-optimized fertilization with crop residues; a bit reduced total area of these leaves, almost the same leaf thickness, mean canopy leaf lilt angle, light extinction coefficient, ratio of light penetration in the upper, middle and lower parts of the wheat canopy, and fair plant type. The experimental results showed insignificant difference in winter wheat yield between the five treatments.